SrO-Sm_20_3-Ta_20_5系セラミックスの粒成長と誘電特性(<小特集>セラミック材料)

概要

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In order to survey new microwave dielectric resonators, complex perovskite compouds having A (B'1/2/B''_1/2) 0_3 composition have been investigated. It was reported previously that the dielectri cceramics fabricated from a stoichiometric powder mixture in Sr (Sm_1/2 Ta_<1/2>)O_3 commposition (SST ceramics) had a high Q value at microwave frequencies and a negative temperature coefficient, and also reported that long time sintering had considerable effects on the densification, grain growth and the improvement of microwave Q for SST ceramics. In this study, HIP'ed SST ceramics were prepared in order to investigate the relation between grain growth and microwave Q with taking notice of the effect of HIP process on the acceleration of grain growth under certain conditions. The results were summarized as follows:(1) Long time sintering was effective to the densification and grain growth of SST ceramics. HIP after long time sintering accelerated the densification and grain growth of SST ceramics. (2) The relative dielectric constants of both normally sintered and HIP'ed SST ceramics increased according to the densification of SST ceramics. (3) Microwave Q of HIP'ed SST ceramics was not improved from that of normally sintered ceramics in spite of the increases of density and grain size.
社団法人日本材料学会の論文
1991-04-15