锑掺杂二氧化锡固溶体形成作用机制研究

采用化学共沉淀法制备了Sn1-xSbxO2(x=0~1)固溶体,用XRD、TG-DTA和XPS手段分析了该类固溶体的物相组成,并根据分析的结果绘制了固相线下相图,重点考察了Sn1-xSbxO2(x=0~1)固溶体的形成作用机制。结果表明:在600~1000℃退火温度下,Sn0.95Sb0.05O2固溶体只有四方金红石型SnO2物相的存在,锑主要以Sb5+的形式进入SnO2晶格内形成有限固溶体,而Sn0.6Sb0.4O2和Sn0.2Sb0.8O2固溶体分别在700和800℃出现了斜方白安矿型Sb2O4和四方金红石型SnO2分相;固相线下Sn1-xSbxO2(x=0~1)固溶体相图分为3个区域:四方SnO2单相区,SnO2+Sb2O4两相区和斜方Sb2O4单相区,四方SnO2单相区是(Sn,Sb)O2ss固溶体(Sb3+或Sb5+进入SnO2晶格内,并达到饱和)。(Sn,Sb)O2ss固溶体可作为导电性好和耐腐蚀的半导体材料。

Study of the Formation Mechanism of Antimony Doped Tin Dioxide Solid Solution

The Sn1-xSbxO2(x=0~1) solid solutions were prepared using chemical coprecipitation method. The phase compositions of these type solid solutions were analyzed using XRD, TG-DTA and XPS. The subsolidus phase diagram of Sn1-xSbxO2(x=0~1) solid solutions was obtained by the results of XRD and TG-DTA analysis. The formation mechanism of Sn1-xSbxO2(x=0~1) solid solutions was emphatically investigated. The results show that there is only quartet SnO2 rutile phase in the Sn0.95Sb0.05O2 solid solution at 600~1000 ℃ annealing temperatures, and Sb is mainly in the form of Sb 5+ entering the SnO2 lattice to form a limited solid solution; however there are trapezoid Sb2O4 cervantite phase and quartet SnO2 rutile phase in the Sn0.6Sb0.4O2 and Sn0.2Sb0.8O2 solid solution at 700 and 800 ℃, respectively. The solidus phase diagram of Sn1-xSbxO2(x = 0~1) solid solutions is divided into three regions: quartet SnO2 single-phase zone, SnO2+Sb2O4 two-phase zone and trapezoid Sb2O4 single-phase zone. The quartet SnO2 single-phase zone is (Sn, Sb)O2ss solid solution (Sb3+ or Sb5+ incorporated into the SnO2 lattice and reached saturation) which could be used as a semiconductor material of the good electrical conductivity and corrosion resistance.