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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–differential thermal analysis,TG–DTA),X射线衍射(X-ray diffraction,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。
Bismuth sodium tungstate [NaBi (WO4) 2, NBW], sodium yttrium tungstate [NaY (WO4) 2, NYW] and sodium gadolinium tungstate [NaGd (WO4) 2, NGW] were grown by the Czochralski method. The crystal was characterized by thermogravimetry-differential thermal analysis (TG-DTA) and X-ray diffraction (XRD). The melting points of NBW, NYW and NGW crystals obtained from TG-DTA curves were 937.7, 1210.0 ° C and 1252.8 ° C, respectively. XRD analysis shows that all three kinds of crystals belong to the tetragonal system, scheelite structure and I41 / a space group. The lattice parameters of the three kinds of crystals were calculated. The lattice parameters of NBW crystals were larger than that of NYW and NGW crystals. The infrared spectra and Raman spectra of the crystals were tested. The vibrational modes of the crystals were analyzed and the vibrational spectra of the crystals were assigned. By comparison, the three structures are basically the same.