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A2(WO4)3(A:Al, Y, Sc)粉体的制备及热膨胀性能

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Abstract:

利用高温固相反应法制备A2W3O12(AAl,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。

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