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采用固相反应法合成出La_(0.6)Sr_(0.4)Co_(1-y)Fe_yO_3体系复合氧化物样品,XRD分析结果证实不同Co/Fe比例的样品中均形成菱形六面体钙钛矿结构,采用固相烧结法制备出致密的La_(0.6)Sr(0.4)Co_(1-y)Fe_yO_3体系陶瓷。研究结果表明,在室温到900℃温度范围内La_(0.6)Sr_(0.4)CoO_3(y=0)的电导率随温度的增加而单调降低,其它Co/Fe比例样品的电导率随着温度的增加出现最大值,电导率达到最大值的温度随Co/Fe比例的降低而提高。在低温段,La_(0.6)Sr_(0.4)Co_(1-y)Fe_yO_3体系的导电行为符合小极子导电机制,导电活化能随Co/Fe比例的降低而增加。
The La_ (0.6) Sr_ (0.4) Co_ (1-y) Fe_yO_3 composite oxide samples were synthesized by solid-state reaction. The results of XRD analysis confirmed that diamond-like hexagonal perovskite structures were formed in the samples with different Co / Fe ratios. The dense La_ (0.6) Sr (0.4) Co_ (1-y) Fe_yO_3 ceramics were prepared by solid-state sintering. The results show that the conductivity of La 0.6 Sr 0.4 CoO 3 (y = 0) monotonically decreases with the increase of temperature at room temperature to 900 ℃. The conductivity of other Co / Fe samples increases with the increase of temperature Increasing the maximum occurs and the temperature at which the conductivity reaches a maximum increases with decreasing Co / Fe ratio. At low temperature, the conduction behavior of La 0.6 Sr 0.4 Co 1-y Fe_yO 3 system accords with the small-pole conduction mechanism, and the conduction activation energy increases with the decrease of Co / Fe ratio.