（MgCoNi）O系氧敏材料的高温电导机理研究

On the Conduction Mechanism at High Temperature of (MgCoNi)O-System Oxygen-Sensitive Materials

研究了（ＭｇＣｏＮｉ）Ｏ系氧敏材料的高温电导同氧分压的关系。结果表明材料中ＮｉＯ含量对电导与氧分压的关系曲线具有显著的影响，通常材料的电导机理可由理想缺陷模型加以解释，然而，当材料在某一特定组分时材料的电导最大，且基本上不随外界氧分压的变化而变化，此时，运用电子跳跃电导模型和Ｍｏｔｔ窄带模型进行解释是合适的。

The relationship between high temperature conduction of(MgCoNi )O-system oxygen-sensitive materials and oxygen partial pressure is studied.It is shown that the influence ofthe NiO content in the(MgCoNi) O materials is significant.The conduction mechanism isusually interpreted by the ideal defect model.For a specific material composition,however,the conductivity of the material is a maximum and is insensitive to the variation of the oxygenpartial pressure,and X-ray diffraction analysis also shows that the lattice constant is mini-mum for the same specific composition, which deviate from the Vigard's Law. It is now ap-propriate to explain these phenomena with the electron hopping model of conduction andMott's narrow-band model.