| SbxSn1-xO2固溶体系电学性能与导电机制研究 |
| STUDY ON THE ELECTRICAL PROPERTIESAND CONDUCTIVE MECHANISM IN SbxSn1-xO2 SOLID SOLUTION SYSTEM |
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| 摘要: 本文报道以均匀共沉淀法制得SbxSn1-xO2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=0.04)的掺入即能提高SnO2电导一个数量级,在x≤0.04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+2e′=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。 |
| 关键词: 二氧化锡 气敏半导体 固溶体 导电机制 |
| 基金项目: 国家自然科学基金资助项目 |
| Abstract: This paper reports a study on the solid solution composition and electrical conductivity in SbxSn1-xO2 gas sensing materials,prepared by chemical coprecipitation method. The experimental results show that the solid solution is formed when 0≤ x≤ 0.30.It is found that the conductance of the samples increases over ten times when doped with trace Sb(x=0.005), and still increases while x≤ 0.04,butslowly decreases when x changesfrom 0.04 to 0.30.The reason for the conductance change and conductive mechanism are discussed in terms of the valence-variable defects,Sb°Sn and Sb′Sn,in the system.The relative content of Sb5+ and Sb3+ ions,coresponding to the defect equilibrium,was estimated by XPS analysis.The A.C. impendance spectroscopy technique also demonstrated the above conductivity-composition behavior. |
| Keywords: SnO2 gassensing semiconductor solid solution conductive mechanism |
| 投稿时间：1995-04-26 |
| 摘要点击次数: 1364 |
| 全文下载次数: 2127 |
| 刘杏芹,朱海宁,沈瑜生.SbxSn1-xO2固溶体系电学性能与导电机制研究[J].无机化学学报,1996,12(2):130-134. |
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