采用传统的固相反应法得到了LaMn0.7Fe0.3O3+δ(δ=0.094),然后对它在N2下,分别在700℃、800℃、850℃退火得到LaMn0.7Fe0.3O3+δ(δ=0.068,0.024,-0.001)系列多晶样品.x射线衍射(XRD)实验结果表明,样品的单相性很好,呈正交相结构.通过测量样品的M-T曲线,研究了此系列样品的磁学性质.实验结果表明,所有样品均有铁磁到顺磁的相变.随着退火温度的升高,样品的氧含量降低,从而导致了居里温度的降低.特别是样品LaMn0.7Fe0.3O2.999仍然表现出的铁磁特征,说明了Mn3+和Fe3+之间存在着双交换作用的可能性.
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