硼掺杂对α-Fe_2O_3-K_2O湿敏半导体陶瓷结构与性能的影响  

Effect of B_2O_3-doped on the Structure and Humidity-sensitive Properties of α-Fe_2O_3-K_2O-B_2O_3 Semiconducting Ceramics

作　　者：莫茂松[1] 阙立志[2] 王银海[3] 汪云 陈小萍 王弘[3] 

机构地区：[1]无锡轻工大学化学与材料工程学院,江苏无锡214036 [2]无锡轻工大学计算科学与信息传播系,江苏无锡214036 [3]中国科技大学材料科学与工程系,安徽合肥230026

出　　处：《无锡轻工大学学报（食品与生物技术）》2000年第3期255-259,共5页Journal of Wuxi University of Light Industry

基　　金：国家自然科学基金!资助项目 (NO .2 9571 0 2 6)

摘　　要：用硬脂酸凝胶法工艺合成不同配比的α Fe2 O3 K2 O B2 O3复合氧化物超微粉 ,经液相烧结法制得多孔陶瓷材料 .采用XRD技术、Archimede排水法及压汞法等研究了材料物相、晶粒度及微孔结构 ;电导测试实验表明 ,B2 O3掺杂相可能以非晶态均匀包覆在主晶相晶粒表面及晶界处 ,K+被吸收包埋在B2 O3非晶相中 ;湿敏特性测试结果表明 ,硼掺杂 5% (摩尔分数 )左右 ,全湿区内材料阻 湿特性曲线线性关系良好 ,且感湿灵敏度较高、湿滞小 ,改变掺杂配比 ,可获得不同湿敏转变点的阻 湿特性曲线 ;初步探讨了材料多孔结构与湿敏性能之间的关系 ,得出通过硼掺杂调控材料微结构 ,可明显提高材料湿敏性能稳定性的结论 .Composite oxide powders of α Fe 2O 3 K 2O B 2O 3 were synthesized by stearic acid gel method, and the porous ceramic materials were detained by the liquid phase calcination method. Effect of B 2O 3 doped on phase composition,grain size ,porosity and average pore size had been investigated.The results showed that doping a little amount of B 2O 3 restrained the formation of KFe 11 O 17 and β K 2O, accelerated the growth of grain,and changed the distribution of pore size. There was no other new phase produced in B 2O 3 doped α Fe 2O 3 K 2O system.The conductance temperature experiment proved that there is a layer of amorphous B 2O 3 on the α Fe 2O 3 grain surface and grain boundary,and K + is possibly buried in the amorphous layer of B 2O 3.The resistence humidity experimental results showed that through controlling B 2O 3 doped amount,α Fe 2O 3 K 2O B 2O 3 ceramics might not only exhibit an optimum sensitivity,a good stability and small hysteresis,but also switch property with different humidity sensitive change over point.Furthermore, the factors effecting hysteresis and stability of the materials were discussed.

关 键 词：硬脂酸凝胶法 硼掺杂 湿敏陶瓷 结构 性能稳定 

分 类 号：TB381[一般工业技术—材料科学与工程]