利用提高固相反应法烧结温度的方法制备了La1-xNaxMnO2.825(x=0.05,0.10,0.15,0.20)缺氧体系,测量了样品的XRD谱、红外光谱、拉曼光谱、M-T曲线、ESR谱线、ρ-T曲线.实验结果表明:与La1-xNaxMnO3体系相比,缺氧体系的磁化强度变小,居里温度Tc下降,出现了多相共存现象,原因是缺氧造成的Mn3+/Mn4+的比例变化,以及样品中氧含量的不均匀性;缺氧体系的电阻率升高,大部分样品表现为绝缘态,原因是氧空位引起的晶格作用、自旋作用与Mn3+/Mn4+的双交换作用的共同竞争.
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