共沈前駆体からのBi_2(Sn_<1-x>Ti_x)_2O_7固溶体の合成と誘電特性 : 合成・キャラクタリーゼーション

概要

論文の詳細を見る
The powder synthesis using coprecipitated precursor and dielectric properties of the sintered products have been; investigated for Bi_2(Sn_<1-x>Ti_x)_2O_7 solid solutions (0.1≦x≦0.7). Examination of the coprecipitation procedure showed that rapid mixing of an aqueous nitrate solution (0.1-0.4 M) containing required cation species with an excess of aq. NH_3 produced a coprecipitated precursor in which uniform, quantitative deposition of each unlike cation species occurred. The precursor was readily converted to desired solid solutions up to x = 0.6 by heating at 500℃-600℃, and finally to a highly densified body by sintering at 1000℃. Dielectric constants of various solid solutions were found to increase almost linearly with increasing substitution by Ti^<4+>, while dielectric anomaly peak temperature indicative of the phase transition from acentric tetragonal to acentric cubic for Bi_2Sn_2O_7 correspondingly decreased. The broadening and shifting of the dielectric anomaly peak with Ti-substitution and/or prolonged sintering were discussed.
社団法人日本セラミックス協会の論文
1990-08-01