锑掺杂浓度对二氧化锡纳米微粉的影响  

Influences of Antimony Concentration on Nanometer-sized Tin Dioxide Powders

作　　者：李青山 张金朝[1] 宋鹂[1] 苑树强[1] 王俊[1] 

机构地区：[1]华东理工大学材料科学与工程学院,上海200237

出　　处：《无机材料学报》2002年第6期1283-1288,共6页Journal of Inorganic Materials

摘　　要：以无机盐为原料,采用共沉淀法制得了掺锑SnO2纳米级微粉.运用X射线衍射(XRD)、透射电镜(TEM)和差热分析(DTA)等观测手段对微粉末进行了表征,比较系统地研究了掺锑浓度对物相、粉末颗粒度及电阻的影响规律.实验结果表明,低掺杂浓度样品(x≤0.462),Sb原子固溶于四方晶系SnO2中,高掺杂浓度样品(x≥0.519),Sb原子将从固溶体中脱溶并被氧化为Sb2O4相;掺杂Sb可以减小SnO2的晶粒度,在热处理时阻碍 SnO2晶粒长大,掺杂浓度>0.181时,进一步掺杂对粉末粒度没有明显的影响;SnO2粉末电导率随掺锑浓度的增大而提高,掺杂浓度为0.095时粉末电导率达到极大值,当掺杂浓度>0.245时,粉末电阻快速增大.兼顾掺杂浓度对粉末粒度和电阻的影响,合适的掺杂浓度x为0.181～0.230.Nanometer-sized antimony-doped tin oxide powders were prepared by coprecipitation using SnCl4.5H(2)O and SbCl3 as starting materials. The characteristics of the powders were investigated by X-ray diffraction (XRD), transmission electron microscope (TEM) and differential thermal analysis (DTA). The influences of antimony concentration on the phase, particles size and powders resistance were researched. The results indicate that samples with lower Sb concentration (x less than or equal to 0.462) are tetragonal SnO2 phases with Sb atoms as the solute in the lattice while Sb atoms are separated from tetragonal SnO2 phases and oxidized into Sb2O4 phase in samples with higher Sb concentration(x > 0.519); Doped Sb plays the role of reducing SnO2 crystallite size and restrains the crystallite growth during heat treatment, and the particle size is insensitive to Sb concentration when Sb concentration is above 0.181; the electric conductivity of SnO2 powders increases with increasing Sb concentration and reaches a maximum at x=0.095, and the resistance of samples increases rapidly at x > 0.245. The optimal range of Sb concentration is 0.181similar to0.230.

关 键 词：锑 掺杂浓度 二氧化锡 纳米微粉 纳米级掺锑 电阻 电导率 

分 类 号：TB383[一般工业技术—材料科学与工程]