La添加(Ba, Sr)TiO_3セラミックスの低抵抗化に及ぼすSrの影響

概要

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La-doped (Ba, Sr)TiO_3 ceramics were prepared by using high purity starting materials to clarify the influence of Sr addition on the semiconducting behavior of BaTiO_3. No sintering aids such as SiO_2 and excess TiO_2 were used. Resistivity at room temperature, grain growth and Curie temperature (T_C) were studied as functions of Sr content. The addition of Sr within a range of 20 mol% enhanced grain growth, and the room-temperature resistivity decreased with increasing Sr content. The decreasing rate of T_C in Ba_<0.8-x>La_xSr_<0.2>TiO_3 was smaller than that in Ba_<1-x>La_xTiO_3 with La content (x), but the total amount of La incorporated into the grains is considered not to be noticeably influenced by Sr addition. The present result may suggest that the addition of Sr increases the ratio of the concentration of La incorporated into the lattice compensated with free electrons to the total content of La doped. The addition of further amounts of Sr caused an increase in the total resistivity.
社団法人日本セラミックス協会の論文
1997-05-01