摘要
利用X射线衍射 (XRD)、差热 热重 (DSC/TG)与直流四探针测试分析方法研究了少量Ca取代LaCoO3 中部分La的合成过程及对其电导率的作用。采用固相反应合成的La0 .8Sr0 .2 -xCaxCo0 .9Fe0 .1 O3 -δ(LSCCF ,0≤x≤ 0 1)氧化物为单一钙钛矿相 ,其烧结过程可以分为 3个阶段 :即反应原料的变化 ;LaCoO3 基氧化物的生成 ;LSCCF固溶体的形成。LSCCF复合掺杂材料电导率的最大值都超过了 10 0S·cm- 1 。
Effects of little substitution of Ca for La site in LaCoO 3 based oxide on the synthesis and electrical conductivity were investigated via X ray diffraction (XRD), DSC/TG, and ordinary four probe dc measurement methods. La 0.8 Sr 0.2- x Ca x Co 0.9 Fe 0.1 O 3- δ (LSCCF, 0≤ x ≤0 1) prepared by solid reaction synthesis is all of single phase and the calcined process may be divided into three stages: (1) decomposition of reactants; (2) formation of LaCoO 3 based oxides; and (3) formation of LSCCF solid solution. The electrical conductivity maximum of the LSCCF composites is above 100 S·cm -1 and the conduction mechanism is attributed to the adiabatic hopping of p type small polarons.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2002年第1期81-84,共4页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金资助项目 ( 5 0 0 740 19)
