StudiesonNaLn（WO4）2SingleCrystals（Ln=La,Pr,Nd）

被引：0

作者：

李红军

洪广言

越淑英

机构：

[1] ChangchunInstituteofAppliedChemistryAcademiaSinica,Changchun,China,ChangchunInstituteofAppliedChemistry,AcademiaSinica,Changchun,China,ChangchunInstituteofAppliedChemistry,AcademiaSinica,Changchun,China,

来源：

Journal of Rare Earths | 1991年 / 01期

关键词：

Rare earth; Crystal growth; Tungstates; Structure; Excitation and fluorescence spectra;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

<正> The crystals of NaLn（WO4）2（Ln=La,Pr,Nd）are grown from a melt of LiCl-Na2WO4 flux by slowcooling method.The chemical analysis data show that the crystals are NaLa（WO4）2,NaPr（WO4）2 andNaNd（WO4）2 respectively.The structures of the crystals are ascertained that they belong to scheelite structureof the tetragonal system with a space group of 141/a.The lattice parameters of the crystals have beencalculated.It is found that the cell volume of NaLn（WO4）2 crystals decrease with a decrease of Ln3+radius.The bond distances and their angles in NaLa（WO4）2 and NaNd（WO4）2 are given.It is found that inaccordance with the decrease of ionic radii of Ln3+due to increase of atomic number,the bond distances betweenLn-O,Ln-Ln and W-O decrease regularly.The infrared spectra of NaLn（WO4）2 are measured.Thetetrahedra characteristic absorptions of WO42-are shown.The sensitization of host lattice is observed from theexcitation and fluorescent spectra of NaLa（WO4）2 and NaPr（WO4）2.

引用

页码：42 / 46

页数：5