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利用高温固相反应法制备A2W3O12(A:Al,Sc,Y,下同)负热膨胀材料,利用X射线衍射仪测定材料的晶体结构、晶胞参数及晶胞体积,结果表明:随A3+半径增大,A2W3O12的晶胞参数和晶胞体积增大。热膨胀系数测试结果表明:A2W3O12具有良好的负热膨胀性能,热膨胀系数绝对值随A3+半径增大而增大。以Sc2W3O12为复合相制备Si基Si/Sc2W3O12复合材料,Sc2W3O12的加入可有效降低复合材料热膨胀系数的绝对值。
Abstract：A2W3O12(A:Al,Sc,Y,the same below) negative thermal expansion materials were prepared by the solid state method at high temperature.The crystal structure,cell parameters and cell volume were characterized using X-ray diffractometer.Results show that the cell parameters and cell volume increase with the increase of radii of the A3+.Results by thermal expansion coefficient test indicate that all of the A2W3O12 compounds obtained exhibit a superior negative thermal expansion property.The thermal expansion coefficient increases with the increase of the radii of the A3+.The thermal expansion coefficient of the Si/Sc2W3O12 composite could be efficiently decreased in Si-based composite by the addition of the Sc2W3O12.
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基本信息:
DOI：10.14062/j.issn.0454-5648.2011.05.014
中图分类号:TB383.3
引用信息:
[1]李军,刘芹芹,杨娟,等.A_2(WO_4)_3(A:Al,Y,Sc)粉体的制备及热膨胀性能[J].硅酸盐学报,2011,39(05):739-742.DOI:10.14062/j.issn.0454-5648.2011.05.014.
基金信息:
国家自然科学基金(50772044);; 教育部高等学校博士点基金(200802990001)资助项目
2011-05-15
2011-05-15