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本文报道以均匀共沉淀法制得 Sbx Sn1 -x O2 体系半导体气敏材料 ,研究了固溶体组成与电导的变化规律 ,并对导电机制进行了讨论。结果表明 :x<0 .30时均可生成固溶体。微量 Sb(x=0 .0 4 )的掺入即能提高 Sn O2 电导一个数量级 ,在 x≤ 0 .0 4区间电导都呈上升趋势 ,其后一直到固溶范围内随着 X增加 ,电导反而缓慢下降。根据体系中存在的 Sb°Sn和 Sb′Sn两种缺陷 ,讨论了其电导变化和导电机制。认为平衡 Sb°Sn+2 e′=Sb′Sn对上述导电机制起决定作用。XPS分析对 Sb5+、Sb3 +的含量进行了确认 ,交流阻抗谱的测试结果从另一角度对电导行为加以证实。
In this paper, SbxSn1-xO2 system semiconductor gas sensing materials were prepared by coprecipitation method. The variation of composition and electrical conductance of solid solution was studied. The mechanism of electrical conduction was also discussed. The results show that solid solution can be formed when x <0.30. The incorporation of trace Sb (x = 0.04) can increase the conductance of SnO2 by an order of magnitude, and the conductance shows an upward trend in the range of x≤0.04 until the solid solution increases with the increase of X Instead, slowly decline. According to the existence of the system of Sb ° Sn and Sb’Sn two defects, discussed the conductance change and conduction mechanism. It is considered that the balance of Sb ° Sn + 2 e ’= Sb’Sn plays a decisive role in the above conduction mechanism. XPS analysis confirmed the contents of Sb5 + and Sb3 +, and the results of AC impedance spectroscopy confirmed the conductance from another angle.