【摘要】 探索性地研究了由内含不同程度CeO2的廉价原料———La2O3制备的,名义成分为(La0.8-xCexSr0.2)0.97MnO3(x=0~0.26)类钙钛矿锰氧化物的相结构、电磁性能,及其作为固体氧化物燃料电池(SOFC)空气极材料的可能性。实验显示,样品中除了磁性的钙钛矿相外,均出现了非磁性的Mn3O4相和不同程度的CeO2相;随着制备样品的原材料La2O3纯度的不同,样品的电阻率、磁电阻比等电磁特性也随之发生明显的变化;样品在1 T磁场下的室温磁电阻比的范围可达-3%~-14%;对x=0,0.037,0.26的样品,其电导率在600 K以上高温区均表现出较好的温度稳定性,表明其作为SOFC空气极材料的可行性。更多还原

【Abstract】 Phase structures,the transport and magnetic properties of the Perovskite-type manganite(La_0.8-xCe_xSr_0.2)_0.97 MnO₃（x=0～0.26） prepared by La₂O₃ with different contents of CeO₂ were studied.Experiments show that the compounds consist of a magnetic perovskite phase and non-magnetic CeO₂ and Mn₃O₄.The resistivity and magnetoresistance ratio（MR） of the samples vary with changing x.Their room-temperature MR reaches-3%～-14% at the magnetic field of 1 T.For x=0;x=0.037 and x=0.26 samples,the conductance keeps unchanged basically in a relatively wide temperature range above 600 K,and the result shows that it is feasible for producing SOFC cathode materials with these samples.更多还原