化学共沉淀法制备气敏材料Cd_(2+X)Sb_2O_(6.8)  

THE GASSENSING MATERIAL Cd\-\{2+X\}Sb\-2O\-\{6.8\}\= MADE BY CHEMICAL COPRECIPITATION

作　　者：刘亚飞[1] 刘杏芹[1] 

机构地区：[1]中国科学技术大学材料科学与工程系

出　　处：《无机化学学报》1999年第3期293-300,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金

摘　　要：采用化学共沉淀法，以可溶性的镉盐和三价锑盐为源物质、氢氧化物作共沉淀剂，在较宽的Ｃｄ／Ｓｂ摩尔配比范围内，制备出了具有缺陷烧绿石结构的镉锑复合氧化物Ｃｄ２Ｓｂ２Ｏ６．８及其固溶体。研究了烧成条件对产物的影响，在较低温度（６００℃）下得到了纯相Ｃｄ２Ｓｂ２Ｏ６．８的超微粉，并对其高温反应机理进行了探讨。所得微粉产物制成的厚膜元件经气敏测试，发现ｎ（Ｃｄ）／ｎ（Ｓｂ）＝１．１０、９００℃、３ｈ烧成的间隙型固溶体Ｃｄ２＋ＸＳｂ２Ｏ６．８，对乙炔气体具有非常优秀的气敏性能。he ultramicro powders of the complex oxide Cd\-2Sb\-2O\-\{6.8\} and its solid solutions, with defect pyrochlore structures, were prepared by a modified chemical coprecipitation method, using a caustic alkali as the precipitant and solvable cadmium and trivalent antimony salts as the precursors. The effects of preparation conditions on the product phase compositions and structures were also studied. The pure Cd\-2Sb\-2O\-\{6.8\} phase could be obtained at a low calcining temperature (600), and a hightemperature reaction mechanism was proposed to explain it. The gassensing properties of the thick film elements based on the various product powders were tested. It is found that the interstitial solid solution Cd\-\{2+X\}Sb\-2O\-\{6.8\}, made with n(Cd)/n(Sb)=1.10 and calcined at 900 for 3 h, shows to be an excellent gassensing material.\;\;

关 键 词：化学共沉淀法 缺陷烧绿石结构 气敏材料 

分 类 号：O657.1[理学—分析化学] O649[理学—化学]