Abstract

Ceramic samples of new compositions (La_0.8Sr_0.2){[Ga_0.8–x(Ge_0.5Mg_0.5)_x]Mg_0.2}O_3–d (x = 0, 0.1, 0.2, 0.4, 0.6, and 0.8) modified with a bismuth additive are obtained via solid-phase synthesis, and their phase formation, structure, microstructure, and electrical conductivity are studied. It is established that a phase with perovskite structure containing a pseudocubic unit cell forms at x = 0–0.6, and the unit cell volume falls because of the partial substitution of cations. The ceramic is characterized by high density, uniform microstructure, and dense grain packing with manifestation of the submelting of grain boundaries, reflecting a liquid-phase mechanism of sintering. Temperature dependences of the total conductivity of synthesized ceramic samples are studied, and high conductivities are confirmed at temperatures near 1000 K.

中文翻译：

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Bi2O3改性离子导电(La, Sr)(Ga, Ge, Mg)O3−y陶瓷的相形成和性能

摘要

新成分 (La _0.8 Sr _0.2 ){[Ga _{0.8– x} (Ge _0.5 Mg _0.5 ) _x ]Mg _0.2 }O _{3– d} ( x = 0, 0.1, 0.2, 0.4, 0.6, and 0.8) 的陶瓷样品通过固相合成获得铋添加剂，并研究了它们的相形成、结构、微观结构和电导率。已确定，在x 处形成含有假立方晶胞的钙钛矿结构相= 0-0.6，由于阳离子的部分取代，晶胞体积下降。陶瓷的特点是密度高、显微组织均匀、晶粒堆积致密，表现为晶界亚熔，反映了烧结的液相机制。研究了合成陶瓷样品总电导率的温度依赖性，并在接近 1000 K 的温度下证实了高电导率。