摘要
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。
This paper reports a study on the solid solution composition and electrical conductivity in Sbx Sn1 -x O2 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 .0 0 5 ) , and still increases while x≤ 0 .0 4 ,butslowly decreaseswhen x changesfrom0 .0 4 to0 .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.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
1996年第2期130-134,共5页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金资助项目
