LEAD-FREE PIEZOELECTRIC CERAMIC COMPOSITION WITH EXCELLENT ELECTRIC FIELD-INDUCED STRAIN PROPERTY, AND METHOD FOR PRODUCING SAME

25-09-2017 дата публикации
Номер:
KR1020170107410A
Принадлежит:
Контакты:
Номер заявки: 01-17-102004926
Дата заявки: 18-08-2017

[1]

The present invention refers to field organic transformation characteristic of having excellent piezoelectric ceramic composition and manufacturing method relates to search, more particularly (1 a-x-a y) Bi1/2 Na1/2 TiO3 - XSrTiO3 + YBiFeO3 Or (1 a-x-a z) Bi1/2 Na1/2 TiO3 - XSrTiO3 + ZLaFeO3 A lead-free piezoelectric ceramic composition and a composition in manufacturing method are disclosed.

[2]

[3]

The electronics industry in the field of piezoelectric ceramic has good piezoelectric element dielectric properties and which plays an important role in mecca [thu nick [su, communication device in the field of filter, including piezoelectric transformer is connected to the medical field, the field sensor, home e in the field, etc. inner precision metrology instrument used. In particular, precision actuator (actuator) cookies or ultrasonic application element or an information communication elements material etc. as applicable to penetrate through.

[4]

Current, Pb (Zr, Ti) O material is preferably a piezoelectric ceramic3 (Hereinafter, referred to as' PZT ' by) based ceramic material produced from being disclosed. Said PZT-based piezoelectric ceramic material excellent in the number bath process technology may be priced cost is well known, piezoelectric sensor and actuator is applied to various and, in addition piezoelectric transducers (piezoelectric transducer), sensor, vibrator (resonator) material for electronic devices such as power is supplied to a development wide range of folate.

[5]

However, most of the PZT-based ceramic material occupies 50% or more metallization lead (Pb) weight ratio have a composition including, a surface in which the pin is point number in a door. In addition, the use of material containing lead before world number [...] cookies to obtain an or, PZT-based ceramic material in the electronics industry to replace a Pb-free material are developed in a subject are provided which number not [...] number outside the turned on. From polluting same comprises a transceiver, groove channels on a lead-free (Pb-a free) family of ceramic material may be developed a space larger than the aluminum, to replace existing PZT-based material such a level that can of a lead-free system mounted on be reported bar is free.

[6]

On the other hand, recent as complex from a lead-free piezoelectric ceramic material, bismuth (Bi) based lead-free piezoelectric ceramics (Bi1/2 Na1/2 ) TiO3 (BNT) and (Bi1/2 K1/2 ) TiO3 (BKT) where the, they perovskite (perovskite) structure with excellent in piezoelectric characteristics are known as disclosed. However, high dielectric breakdown voltage of the metastasis-based (coercive field) (breakdown voltage) and low in polarization is fixed using piezoelectric characteristics due to practical element that corresponds to the adsorption fixing plate door number point that the pin is. The, BaZrO these substances3 , CeO2 , BiO2 , SrCO3 Chemical improved etc. and substitution studies is carried but, until now in lead-free piezoelectric ceramic or stability of 5 kv/mm or more in high electric fields is higher than the PZT based piezoelectric material while its strain, the strain hardened 4 kv/mm hereinafter practical range low field in organic field, in order to practical improvement additionally in a database of the electrical property are disclosed (patent document 1 and reference 2).

[7]

In addition, among various piezoelectric properties when an electric field is applied to the field of piezoelectric actuator signal from strain filtered require and, in particular mobile phone, microscope and precise accuracy is reduced in size and first unit requiring actuator signal from control electrode representing deformation properties as well as good or necessarily, for the known lead-free piezoelectric ceramic material having these properties is free.

[8]

The study, the present invention victims of the bismuth (Bi) based lead-free piezoelectric ceramics BiFeO3 Or LaFeO3 Number number [...] his novel manner so that the high pressure liquid coolant metal ceramic composition. In addition, the present invention the victims of the control electrode of the subject compositions excellent field organic deformation properties and characterized.

[9]

[10]

A compensation publicized patent number 10 - 2011 - 0038600 callA compensation publicized patent number 10 - 2012 - 0134928 call

[11]

The purpose of the invention having excellent piezoelectric ceramic composition [...] number field organic deformation properties are disclosed. The present invention refers to bismuth (Bi) based piezoelectric ceramics BiFeO3 Or LaFeO3 High pressure liquid coolant lead-free piezoelectric ceramic composition number by adding metal oxide, organic strain even without control electrode lead results in high electric fields to be representing composition [...] his number.

[12]

It is another object of the present invention said lead-free piezoelectric ceramic composition a number [...] manufacturing method are disclosed.

[13]

[14]

In order to achieve said purposes, aspects of the present invention number 1, having a composition represented by formula 1 for lead-free piezoelectric ceramic composition number [...] substrate.

[15]

[Formula 1]

[16]

(1 provided x-a y) Bi1/2 Na1/2 TiO3 - XSrTiO3 + YBiFeO3

[17]

(In said formula 1, x is 0. 16 to 0. 28 and, y is 0. 01 to 0. 04 are disclosed.)

[18]

Aspects of the present invention number 2, lead-free piezoelectric ceramic composition having a composition represented by formula 2 to number [...] substrate.

[19]

[Formula 2]

[20]

(1 provided x-a z) Bi1/2 Na1/2 TiO3 - XSrTiO3 + ZLaFeO3

[21]

(In said formula 2, x is 0. 16 to 0. 28 and, z is 0. 01 to 0. 03 are disclosed.)

[22]

Aspects of the present invention number 3, lead-free piezoelectric ceramic composition represented by said formula 1 as manufacturing method, 1) Bi2 O3 , Na2 CO3 , TiO2 , SrCO3 And Fe2 O3 Each powder and weighing, to exhibit wet mixing step; and 2) said mixture at a temperature of 800 to 900 milled zeolite catalysts; a number including manufacturing method a [...] substrate.

[23]

Aspects of the present invention number 4, lead-free piezoelectric ceramic composition represented by said formula 2 as manufacturing method, 1) Bi2 O3 , Na2 CO3 , TiO2 , SrCO3 , Fe2 O3 And La2 O3 Each powder and weighing, to exhibit wet mixing step; and 2) said mixture at a temperature of 800 to 900 milled zeolite catalysts; a number including manufacturing method a [...] substrate.

[24]

Aspects of the present invention number 5, the present invention according to lead-free piezoelectric ceramic composition including piezoelectric application element number [...] substrate.

[25]

In one embodiment of the present invention example, the present invention according to lead-free piezoelectric ceramic composition, 4 kv/mm hereinafter more electric driving electric field 300 pm/V organic strain (Smax/Emax) May be disclosed.

[26]

In one embodiment of the present invention example, the present invention according to the manufacturing method lead-free piezoelectric ceramic composition, said 2) after, 3) wet grinding and dried after said calcined ceramic powder, compression-molding step number tank shaped bodies; and 4) said shaped bodies at a temperature of 1100 to 1200 sintering step-like specimen number bath; can be further comprise.

[27]

[28]

The present invention according to lead-free piezoelectric ceramic composition, lead-based compound represented by number without lead has an door can be solve. In addition, 4 kv/mm hereinafter low field conditions of the existing method PZT based piezoelectric material to replace a field organic deformation properties as well as good exhibit piezoelectric actuator applications including piezoelectric applicable devices to control various fields and, in particular accuracy is required reduced in size and can be used in fields in which tranfectants disclosed.

[29]

[30]

Figure 1 of the present invention lead-free piezoelectric ceramic composition, represented by formula 1 (1 a-x-a y) Bi1/2 Na1/2 TiO3 - XSrTiO3 + YBiFeO3 (Wherein, x is 0. 26 and, y is 0. 01 that would yield a) composition compositions having field organic strain (S provided E) Curve indicating degrees disclosed. Figure 2 of the present invention lead-free piezoelectric ceramic composition, composition of formula 1 according to piezoelectric ceramic composition field organic strain (S provided E) Curve indicating degrees disclosed. Figure 3 of the present invention lead-free piezoelectric ceramic composition, composition of formula 2 according to piezoelectric ceramic composition field organic strain (S provided E) Curve indicating degrees disclosed.

[31]

The present invention refers to various modification may have various can apply in the embodiment which is, in the embodiment example drawing and detailed description specific to the broadcast receiver. However, the present invention is defined with respect to a particular embodiment form which are not included, all changing range of idea and techniques of the present invention, including the water to replacement should understood to evenly.

[32]

The entire specification herein, any components that "comprising" when any portion, particularly the opposite substrate [...] number but without other components further can include other components which means that the other.

[33]

The entire specification used herein the term "- (a) step" or "steps of -" which means "- stage for" is not. The entire specification herein, the term "A and/or B" of "A or B, or A and B" big.

[34]

The entire specification herein, the term "combinations thereof" of e [khwu city type representation comprising components selected from the group consisting of e [khwu city type representation described more mixed or combinations as means, said means including at least one selected from the group consisting of components to each other.

[35]

[36]

The present invention refers to a manufacturing method having excellent piezoelectric ceramics and of organic transformation characteristic field are disclosed.

[37]

Lead-free piezoelectric ceramic high PZT based piezoelectric ceramic included can replace the material of interest as environmentally friendly while, excellent in piezoelectric characteristics lead-free piezoelectric ceramic studies for developing an X-on we shall be, typically (Bi1/2 Na1/2 ) TiO3 (BNT) including bismuth (Bi) based ceramic has been developed.

[38]

The bismuth (Bi) based lead-free piezoelectric ceramic composition ABO3 And represented, in the case of BNT, A Bi in place3+ And Na+ The A position determines a composite perovskite structure. If the royal tomb really BNT (rhombohedral) at room temperature is large as formed by a remanent polarization (remnant polarization) tranfectants but having ferroelectric piezoelectric, dielectric breakdown voltage of the high and low in polarization is fixed product-metastasis due to practical element is a piezoelectric properties to the adsorption fixing plate number point that door pin is utilized.

[39]

On the other hand, ABO3 Perovskite structure stoichiometric composition as above-mentioned, A Bi in place3+ =1/2 and, Na+ =1/2 and, B Ti in place4+ =1. 0 total home appliance person cation at the number of oxygen ions at the 3 + 6 -6 electrically neutral holds together. The user appliance 1+ The composition of the ceramic composition of Na 1/2 escaped from the non-stoichiometric number so that the high pressure liquid coolant, ABO3 According to impurities formed on lack does not generate a charge compensation limit in terms of cation. The micom Bi itself maintained electrically neutral3+ Is Bi5 + The activity or anion oxygen vacancies is formed in which a piezoelectric constant change an explosive process appear piezoelectric characteristics are combined each other. In this way, lead bismuth (Bi) system of a lead-free piezoelectric ceramic piezoelectric without using the lead (Pb) of the existing method of improved piezoelectric ceramic material number [...] family of piezoelectric material components fully or partially replace the mirror number repetitively and increase affinity can be results.

[40]

In particular, recent (1 a-x) (Bi1/2 Na1/2 ) TiO3 (BNT)- x (Bi1/2 K1/2 ) TiO3 In ceramic (BKT), x is 0. 16 to 0. 20 boundary area is formed in the vicinity if the royal tomb really in tetragonal - on, on in said boundary area of PZT dielectric and piezoelectric properties found but the fact that the properties are comparable to those boundary, practical same electric characteristics data in a database in order to yet further improvements are disclosed.

[41]

In the present invention, bismuth (Bi) based piezoelectric ceramics Bi1/2 Na1/2 TiO3 The perovskite compound BiFeO3 Or LaFeO3 New composition of a lead-free piezoelectric ceramic composition number when the metal so that the high pressure liquid coolant, said composition exhibits low field as well as good strain can be comprised of an organic field found practical. The present invention refers to the WIPO.

[42]

[43]

Hereinafter, the present invention it relates to 2000.

[44]

The present invention refers to a lead-free piezoelectric ceramic composition having a composition represented by formula 1 number [...] substrate.

[45]

[Formula 1]

[46]

(1 provided x-a y) Bi1/2 Na1/2 TiO3 - XSrTiO3 + YBiFeO3

[47]

(In said formula 1, x is 0. 16 to 0. 28 and, y is 0. 01 to 0. 04 are disclosed.)

[48]

In addition, the present invention refers to a lead-free piezoelectric ceramic composition having a composition represented by formula 2 number [...] substrate.

[49]

[Formula 2]

[50]

(1 provided x-a z) Bi1/2 Na1/2 TiO3 - XSrTiO3 + ZLaFeO3

[51]

(In said formula 2, x is 0. 16 to 0. 28 and, z is 0. 01 to 0. 03 are disclosed.)

[52]

In one embodiment of the present invention example, lead-free piezoelectric ceramic composition of the present invention according to 4 kv/mm hereinafter a low electric field 300 pm/V or more a high electric field organic strain (Smax/Emax) May be disclosed.

[53]

Specifically, the present invention according to lead-free piezoelectric ceramic composition exceeds a driving electric field as well as 4 kv/mm, 4 kv/mm hereinafter practical condition of first threshold exceeds 300 pm/V 250 pm/V practical condition of liquid organic strain (table 1 and table 2 reference) having been identified.

[54]

In addition, beta-keto ester (1 a-x) (Bi1/2 Na1/2 ) TiO3 (BNT)- x (Bi1/2 K1/2 ) TiO3 (BKT)The solid, x is 0. 16 to 0. 20 if the royal tomb really in tetragonal - on boundary area formed on the substrate. The difference between the outside of the region boundary area based on the strength of piezoelectric characteristics, field organic strain (Smax/Emax) To the practical condition in practical inteaching elements are 250 pm/V hereinafter.

[55]

However, the present invention according to lead-free piezoelectric ceramic composition, beta-keto ester (1 a-x) (Bi1/2 Na1/2 ) TiO3 (BNT)- xSrTiO3 (ST)Solid solution perovskite compound BiFeO3 Or LaFeO3 Modified by metal oxides added, a portion of the ferroelectric crystal structure phase is mixed with an a result appears to differ by region is equal to two. The two coexisting when maximum strain field organic detergent and, through this composition the present invention according to practical range 300 pm/V or more excellent field organic strain can exhibit.

[56]

On the other hand, piezoelectric material in the most important property field organic strain (Smax/Emax, Unit is pm/V) value. The present invention according to lead-free piezoelectric ceramic composition, which can exhibit excellent field organic strain without the use of lead, said ends at or higher than the low first threshold field organic strain 300 pm/V, and the PZT ml 250 pm/V field organic strain when in clock, excelling in practical can be know.

[57]

Other in one aspect, the present invention refers to a lead-free piezoelectric ceramic composition represented by formula 1 as to manufacturing method, 1) Bi2 O3 , Na2 CO3 , TiO2 , SrCO3 And Fe2 O3 Each powder and weighing, to exhibit wet mixing step; and 2) said mixture at a temperature of 800 to 900 milled zeolite catalysts; a number including manufacturing method a [...] substrate.

[58]

[Formula 1]

[59]

(1 provided x-a y) Bi1/2 Na1/2 TiO3 - XSrTiO3 + YBiFeO3

[60]

(In said formula 1, x is 0. 16 to 0. 28 and, y is 0. 01 to 0. 04 are disclosed.)

[61]

In addition, the present invention refers to manufacturing method for lead-free piezoelectric ceramic composition represented as formula 2, 1) Bi2 O3 , Na2 CO3 , TiO2 , SrCO3 , Fe2 O3 And La2 O3 Each powder and weighing, to exhibit wet mixing step; and 2) said mixture at a temperature of 800 to 900 milled zeolite catalysts; a number including manufacturing method a [...] substrate.

[62]

[Formula 2]

[63]

(1 provided x-a z) Bi1/2 Na1/2 TiO3 - XSrTiO3 + ZLaFeO3

[64]

(In said formula 2, x is 0. 16 to 0. 28 and, z is 0. 01 to 0. 03 are disclosed.)

[65]

In one embodiment of the present invention example, the present invention according to lead-free piezoelectric ceramic composition, said formula 1 and formula 2 depending on its composition, Bi2 O3 , Na2 CO3 , TiO2 , SrCO3 Fe powder2 O3 And/or La2 O3 Powder and the solid chemical method (solid-a state process) number can be added to high pressure liquid coolant. Specifically, industrial use purity Bi2 O3 , Na2 CO3 , TiO2 , SrCO3 , Fe2 O3 And La2 O3 Weighing with a composition which is prepared by said formula 1 and formula 2 of and, after mixing and milling, kneading the mixture in the form of number bath at a temperature of 800 to 900 for performing solid phase chemical reaction time number 1 to 3 calcining said composition can be high pressure liquid coolant.

[66]

The, said Na2 CO3 The hygroscopicity of a wafer can be increased in the periphery of the moisture from the environment during storage and, if there is insufficient amount of moisture by drying before weighing containing composition different from that of the PWM signal to a piezoelectric characteristic can be changed. The, Na2 CO3 Powder of 80 to 100 in drying ovens 20 to 28 hours after nitrogen, already contained longer free moisture drying according to weight, i.e. after complete drying can be to the state of the weighing.

[67]

In addition, said 1) the milling step, particularly if the number not one method or conditions typically used per industry can be used. For example, ball milling method can be performed, ball milling method performed when absolute ethanol, ethanol, organic solvent such as acetone 24 can be wet mixing time.

[68]

Further, calcining said milled mixture 2) prior to, milled mixture can further include the step of drying the flowable mixture at 80 to 90.

[69]

In one embodiment of the present invention example, the present invention according to the manufacturing method lead-free piezoelectric ceramic composition, said 2) after, 3) wet grinding and dried after said calcined ceramic powder, compression-molding step number tank shaped bodies; and 4) said shaped bodies at a temperature of 1100 to 1200 sintering step-like specimen number bath; can be further comprise.

[70]

Said 3) in step, said molded body is dried powder which is polyvinyl alcohol (polyvinyl alcohol, PVA), polyvinyl butyral (polyvinyl butyral, PVB) or polyethylene glycol (polyethylene glycol, PEG) is provided on the number can be mixed such as high pressure liquid coolant.

[71]

In addition, said 4) of a sintering process is step, 1 to 3 hours at a temperature of 1100 - 1200 sintering said molded article can be performed, the specimen can be high pressure liquid coolant through a suction line number. The present invention according to piezoelectric ceramic composition structure is deformed if said sintering step is performed by conditions one specially number are not disclosed.

[72]

At least one other aspect, the present invention refers to said lead-free piezoelectric ceramic composition including piezoelectric application element number [...] substrate.

[73]

The present invention according to piezoelectric application element, in order to make the present invention according to piezoelectric ceramic composition including piezoelectric applicable devices piezoelectric characteristics is exerted age number has piezoelectric ceramic article. Said piezoelectric application element, bismuth (Bi) system of a lead-free piezoelectric ceramic composition having a composition of the present invention according to by, low field conditions as well as good organic strain field is 1, can be applied to various fields. Applicable fields include our lives and closely related mobile phone, vehicle, from various medical TV displays, up to the precision of parts can be applied to various fields, filter, piezoelectric resonator, vibrator, sensor, actuator, transformer, piezoelectric generation device (energy harvesting devices) can be in the form of use and also applying.

[74]

[75]

Hereinafter, the present invention in the embodiment with reference to a drawing and detailed the on-sensors other. In the embodiment these more specifically account for the present invention is provided, in the embodiment of the present invention range and not the limited to these.

[76]

In the embodiment 1: lead-free piezoelectric ceramic composition number bath

[77]

Commonly used for industrial Bi purity2 O3 , Na2 CO3 , TiO2 , SrCO3 , Fe2 O3 , La2 O3 Ceramic powder such as weighing with a composition which decreases or 1 and table 2 and ball milling (ball milling) to 48 hours conducting wet mixing method. After drying the mixture of dough, solid chemical reaction to create about 850 (calcination) powder was calcined in 2 hours. Calcined ceramic composition after wet grinding and assembled, press-molding was molded into yarns. Using 12 mm diameter was about 100 mpa pressure molding in mold molding. 2 hours at a temperature of 1150 to 1175 in electric furnace sintering molded plate-like specimen number was high pressure liquid coolant. Then, high pressure liquid coolant for polarizing the number sintered body thickness of greater than about 1. A beam is 0 mm, and small minute electrodes (Ag) electrode bar on both sides printed coating technique is weight percent.

[78]

In the embodiment 2: lead-free piezoelectric ceramic composition piezoelectric characteristic

[79]

On both sides of a linear variable differential converter field organic strain is changed again by using a high voltage while applying a transparent conductive layer (linear variable differential transducer; LVDT), stress-strain curve (also 1 and 2 also) measured field organic synchronous strain (normalized strain; Smax/Emax) Of the bill. For table 1 and table 2 have shown to result.

[80]

SampleCompositionStrain (SMax/EMax;Pm/V)
xy3 kv/mm4 kv/mm5 kv/mm
10. 240. 01176357514
20. 260. 01513760-
30. 280. 01313572-
40. 200. 02303280252*
50. 220. 02486417378
60. 240. 02383722-
70. 260. 02310652680
80. 280. 02333500600
90. 200. 03346285268*
100. 220. 03532443388
110. 240. 03192577581
120. 260. 03176465554
130. 280. 03204312464
140. 160. 04250245240*
150. 180. 04470412364
160. 200. 04120472528
*: Patent claimed by out-of-range.

[81]

[82]

SampleCompositionStrain (SMax/EMax;Pm/V)
xy3 kv/mm4 kv/mm5 kv/mm
170. 160. 03156305318*
180. 180. 01226235238*
190. 180. 02303310300*
200. 180. 03166335360*
210. 200. 01606522492
220. 220. 01300585540
230. 240. 01333500427
240. 240. 02100182298*
250. 260. 01233465466
260. 260. 02133285356*
270. 280. 01220257292*
*: Patent claimed by out-of-range.

[83]

[84]

As shown in table 1 and table 2 said, lead-free piezoelectric ceramic composition of the present invention according to the first threshold field organic strain excellent 4 kv/mm hereinafter can be know. Specifically, said embodiment exceeds a driving electric field as well as example 1 according to ceramic composition are 4 kv/mm, 4 kv/mm hereinafter for driving first threshold results in high electric fields 300 pm/V or more organic strain (table 1, table 2, also 1 and 2 also) represents has been confirmed. In particular, ceramic in the compositions example 1 according to said embodiment, sample 2 (represented by formula 1 (1 a-x-a y) Bi1/2 Na1/2 TiO3 - XSrTiO3 + YBiFeO3 (Wherein, x is 0. 26 and, y is 0. 01 that would yield a)) 4 kv/mm maximum strain of electric field 760 pm/V compositions of precursor, even lower than 500 pm/V or more have shown excellent field organic strain field is 3 kv/mm (table 1 and also 1).

[85]

Said result, piezoelectric ceramic composition of the present invention practical condition of field and 250 pm/V 4 kv/mm hereinafter more electric fields can meet the practical as well as the organic strain is, 4 kv/mm 300 pm/V or more than the first threshold number dielectric composition exhibits excellent field organic strain actuator employed for useful accuracy by requiring reduced in size and used can be cylindrical. In addition, piezoelectric ceramic material of the present invention alternatively existing PZT-based material does not contain harmful to the human body by PZT piezoelectric ceramic material to replace lead represents applicability as has been confirmed.

[86]

[87]

The present invention is up to about number preferred embodiment examples for flaws. The present invention is in the field of the present invention is provided essentially from deviating from a person with skill in the art of the present invention is embodied in the form of modified inputted properties may be understand it will rain. The definitive aspect as well as the descriptive disclosure examples embodiment contemplated in the aspect should. The aforementioned range of the present invention description and claim rather than as shown, and the present invention is in a range equal to all differences may be carried on an will be interpreted.

[88]



[1]

The present invention relates to a lead-free piezoelectric ceramic composition with excellent electric field-induced strain property, and a method for producing the same, and more particularly, to a lead-free piezoelectric ceramic composition having a composition of (1-x-y)Bi_(1/2)Na_(1/2)TiO_3-xSrTiO_3+yBiFeO_3 or (1-x-z)Bi_(1/2)Na_(1/2)TiO_3-xSrTiO_3+zLaFeO_3. According to the present invention, the lead-free piezoelectric ceramic composition exhibits excellent electric field-induced strain property even under low electric field conditions of 4 kV/mm or less, thereby being applicable to a piezoelectric application device in various fields including the field of piezoelectric actuators, by replacing an existing lead zirconate titanate (PZT)-based piezoelectric material. In particular, the lead-free piezoelectric ceramic composition of the present invention may be applicable to fields which require a compact and high precision configuration.

[2]

COPYRIGHT KIPO 2017

[3]

[4]

  • (AA) Strain rate (%)
  • (BB) Electric field (kV/mm)



A composition represented by formula 1 has, in the composition of the metal oxide ferroelectric and lead-free piezoelectric ceramic composition in the presence of two coexisting region of said lead-free piezoelectric ceramic composition 4 kv/mm (Smax/Emax) of liquid organic strain exhibiting water 500 pm/V electric field: [formula 1] (1 a-x-a y) Bi1/2 Na1/2 TiO3 - XSrTiO3 + YBiFeO3 (In said formula 1, x is 0. 24 to 0. 28 and, y is 0. 01 to 0. 03 are disclosed.)

Has a composition represented by formula 2, composition within the ferroelectric and metal oxides of lead-free piezoelectric ceramic composition in the presence of two coexisting region said lead-free piezoelectric ceramic composition 4 kv/mm hereinafter more electric driving electric field 500 pm/V (Smax/Emax) organic strain exhibiting water: [formula 2] (1 a-x-a z) Bi1/2 Na1/2 TiO3 - XSrTiO3 + ZLaFeO3 (In said formula 2, x is 0. 20 to 0. 26 and, z is 0. 01 to 0. 02 are disclosed.)

Number 1 or number 2 lead-free piezoelectric ceramic composition according to piezoelectric including anti anti applicable devices.

A composition represented by formula 1 has, in the composition of the metal oxide ferroelectric and lead-free piezoelectric ceramic composition in the presence of two coexisting region as manufacturing method, said lead-free piezoelectric ceramic composition exhibits more electric driving electric field 500 pm/V 4 kv/mm organic strain (Smax/Emax), 1) Bi2 O3 , Na2 CO3 , TiO2 , SrCO3 And Fe2 O3 Each powder and weighing, to exhibit wet mixing step; and 2) said mixture at a temperature of 800 to 900 °C milled zeolite catalysts; a including manufacturing method. [Formula 1] (1 a-x-a y) Bi1/2 Na1/2 TiO3 - XSrTiO3 + YBiFeO3 (In said formula 1, x is 0. 24 to 0. 28 and, y is 0. 01 to 0. 03 are disclosed.

Has a composition represented by formula 2, composition within the ferroelectric and metal oxides present lead-free piezoelectric ceramic composition of two coexisting region as manufacturing method, said lead-free piezoelectric ceramic composition 4 kv/mm hereinafter more electric driving electric field 500 pm/V (Smax/Emax) organic strain exhibits, 1) Bi2 O3 , Na2 CO3 , TiO2 , SrCO3 , Fe2 O3 And La2 O3 Each powder and weighing, to exhibit wet mixing step; and 2) said mixture at a temperature of 800 to 900 °C milled zeolite catalysts; a including manufacturing method. [Formula 2] (1 a-x-a z) Bi1/2 Na1/2 TiO3 - XSrTiO3 + ZLaFeO3 (In said formula 2, x is 0. 20 to 0. 26 and, z is 0. 01 to 0. 02 are disclosed.)

According to Claim 4 or Claim 5, said 2) after, 3) wet grinding and dried after said calcined ceramic powder, compression-molding step number tank shaped bodies; and 4) said shaped bodies at a temperature of 1100 to 1200 °C specimen number tank plate by sintering step; further including manufacturing method.