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通过对LaCrO3和NiMn2O4及其复合材料的大量的稳定性试验考察，发现复合材料的稳定性显著优于单相材料．本文应用缺陷化学理论对单相材料老化过程中阻值变化的原因进行了分析，分析表明：老化过程中由于瓷体表面及气孔内吸附的氧逐渐扩散到体内，使氧空位浓度减小，从而使p型半导瓷LaCrO3阻值缓慢减小，而使n型半导瓷NiMn2O4的阻值缓慢增大，解释了复合材料优异的耐高温特性是由于复合材料的补偿效应．
Through a large number of stability tests on LaCrO3 and NiMn2O4 and their composites, the stability of the composites was found to be significantly better than that of single-phase materials. In this paper, the reasons for the change of resistance value during the aging process of single-phase materials are analyzed by defect chemistry theory. The analysis shows that the oxygen vacancy concentration decreases due to the gradual diffusion of oxygen adsorbed on the surface and pores of porcelain during aging So that the resistance of p-type semiconducting ceramic LaCrO3 decreases slowly, and the resistance of n-type semiconducting ceramic NiMn2O4 slowly increases, explaining that the excellent high temperature resistance of the composite is due to the compensation effect of the composite.