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NaM(WO_4)_2(M:Bi~(3+), Y~(3+), Gd~(3+))晶体生长与结构(英文)

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Abstract:

采用提拉法生长出了钨酸铋钠[NaBi(WO4)2,NBW]、钨酸钇钠[NaY(WO4)2,NYW]和钨酸钆钠[NaGd(WO4)2,NGW]晶体。通过热重–差热分析(thermogravimetry–differentialthermalanalysis,TG–DTA),X射线衍射(X-raydiffraction,XRD)分析对晶体进行表征。由TG–DTA曲线得到NBW,NYW和NGW晶体的熔点分别为937.7,1210.0℃和1252.8℃。XRD分析表明3种晶体都属于四方晶系、白钨矿结构、I41/a空间群。计算了3种晶体的晶胞参数,NBW晶体的晶胞参数要大于NYW和NGW晶体的。测试了晶体的红外光谱及Raman光谱,分析了晶体的振动模式,并将晶体振动光谱进行归属。通过比较认为三者结构基本相同。

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