| 化学共沉淀法制备气敏材料Cd2+XSb2O6.8 |
| THE GAS-SENSING MATERIAL Cd2+XSb2O6.8 MADE BY CHEMICAL COPRECIPITATION |
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| 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 ℃、3 h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。 |
| 关键词: 化学共沉淀法 缺陷烧绿石结构 间隙型固溶体 Cd2+XSb2O6.8 气敏性能 |
| 基金项目: |
| Abstract: The ultramicro powders of the complex oxide Cd2Sb2O6.8 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 Cd2Sb2O6.8 phase could be obtained at a low calcining temperature (600℃), and a high-temperature reaction mechanism was proposed to explain it. The gas-sensing properties of the thick film elements based on the various product powders were tested. It is found that the interstitial solid solution Cd2+XSb2O6.8, made with n(Cd)/n(Sb)=1.10 and calcined at 900℃ for 3 h, shows to be an excellent gas-sensing material. |
| Keywords: chemical coprecipitation pyrochlore structure interstitial solid solution Cd2+XSb2O6.8 gas-sensing properties |
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| 刘亚飞,刘杏芹.化学共沉淀法制备气敏材料Cd2+XSb2O6.8[J].无机化学学报,1999,15(3):293-300. |
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