Eff ect of Ca Addition on Crystal Structure and Electrical Properties of LaMO₃(M=Fe、Mn)

Pervoskite oxides of La_1-xCa_xMO₃(M=Fe、Mn) were prepared by the decomposition of citric complexes and solid state reaction methods respectively;The XRD measurements show that the samples are all in single phase for x≤0.5.When Ca is substituted for La,the electrical resistivities of La_1-xCa_xFeO₃ are in order of 10Ω·cm,it is quite lower than 6×10⁴Ω·cm of LaFeO₃;Comparcd with LaMnO₃,the resistivitics of La_1-xCa_xMnO₃ change lessly and is in order of 10^-1Ω·cm.