HIGH FREQUENCY CERAMIC MATERIAL

WIPO Patent Application WO/2002/008142

A1

The invention relates to ceramic materials based on titanium dioxides and can be used for producing multilayer high frequency thermostable ceramic condensers provided with electrodes based on an alloy which comprises Ag and Pd, and also for producing microwave filters. The aim of the invention is to develop the high frequency ceramic material with a low sintering temperature T¿sin? = 1080 - 1120 °C for silver-vanadium electrodes with a silver content of not less than 70 %. In a first embodiment, the high frequency ceramic material comprises the following components, expressed in mass % : zinc oxide between 16.0 and 23.9 ; niobium oxide between 47.4 and 75.9; titanium oxide having a rutile structure ranging from 0.9 to 35.9. In the second embodiment, a (Zn¿x? Nb¿y? Ti¿z?)O¿2? composition oxide, where generally, X is equal to 0.17, Y is equal to 0.332, Z is equal to 0.5, is used in the high frequency ceramic material as the titanium oxide having the rutile structure. In addition, a zinc niobate ZnNb¿2?O¿6? is added to said ceramic material so that it has the following component ratio expressed in mass % : the (Zn¿x? Nb¿y? Ti¿z?)O¿2? composition oxide ranging from 2 to 8 and the zinc niobate ZnNb¿2?O¿6? ranging from 20 to 98.

NENASHEVA ELIZAVETA ARKADIEVNA (RU)
KARTENKO NELLI FEDOROVNA (RU)

PCT/RU2001/000288

January 31, 2002

July 05, 2001

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NENASHEVA ELIZAVETA ARKADIEVNA (RU)
KARTENKO NELLI FEDOROVNA (RU)

C04B35/00; C04B35/453; C04B35/495; H01G4/12; (IPC1-7): C04B35/00; C04B35/453; C04B35/495; H01G4/12

US4506026A	1985-03-19
SU785273A1	1980-12-07
RU2021207C1	1994-10-15
EP0587140A2	1994-03-16
US5985781A	1999-11-16

Sandigursky, Oleg Lvovich (RU)

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