16-05-2013 дата публикации
Номер: US20130120193A1
A glass-ceramic which is particularly suitable as dielectric for use in the high-frequency range, in particular as dielectric resonator, as electronic frequency filter element or as antenna element is disclosed. The glass-ceramic has at least the following constituents (in mol % on an oxide basis): 5-50% of SiO, 0-20% of AlO, 0-25% of BO, 0-25% of BaO, 10-60% of TiO, 5-35% of ReO, where Ba can be partly replaced by Sr, Ca, Mg, where Re is a lanthanide or yttrium and where Ti can be partly replaced by Zr, Hf, Y, Nb, V, Ta. 3. The glass-ceramic according to claim 1 , in which up to 10% of the barium is replaced.4. The glass-ceramic according to claim 1 , in which up to 10% of the titanium is replaced.5. The glass-ceramic according to claim 1 , which additionally contains from 0.01 to 3 mol % of at least one refining agent.6. The glass-ceramic according to claim 5 , in which the at least one refining agent is selected from the group consisting of SbOand AsO.7. The glass-ceramic according to claim 1 , which has a dielectric loss (tan δ) of not more than 10in the high-frequency range (frequency f>200 MHz).8. The glass-ceramic according to claim 1 , having a relative permittivity ∈ of at least 15.9. The glass-ceramic according to claim 1 , wherein the absolute value of the temperature dependence of the resonance frequency |τ| is not more than 200 ppm/IC.10. The glass-ceramic according to claim 1 , wherein the absolute value of the temperature dependence of the resonance frequency |τ| is not more than 10 ppm/K.11. The glass-ceramic according to claim 1 , which contains at least one mixed crystal phase based on RE claim 1 , Ti claim 1 , Si claim 1 , O claim 1 , Ba claim 1 , where Ba can be at least partly replaced by Sr claim 1 , Ca claim 1 , Mg claim 1 , where RE is a lanthanide or yttrium and where Ti can be at least partly replaced by Zr claim 1 , Hf claim 1 , Y claim 1 , Nb claim 1 , V claim 1 , Ta.12. The glass-ceramic according to claim 1 , which contains at least one ...
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