Structure, luminescence and magnetic properties of AgLnW2O8 (Ln = Eu, Gd, Tb and Dy) compounds

被引：51

作者：

Shi, F ^{[1
]}

Meng, J ^{[1
]}

Ren, Y ^{[1
]}

Su, Q ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, Lab Rare Earth Chem & Phys, Changchun 130022, Peoples R China

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1998年 / 59卷 / 01期

关键词：

complex oxides; infrared spectroscopy; X-ray powder diffraction; luminescence; magnetic properties;

D O I：

10.1016/S0022-3697(97)00148-0

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Four new compounds AgLnW(2)O(8) (Ln = Eu, Gd, Tb and Dy) are prepared by solid-state reactions. They crystallize with a scheelite-related monoclinic symmetry. Infrared (IR) spectra show complicated absorption transitions in the region of 1000-400 cm(-1) that are similar to those of AgLnMo(2)O(8). Broad excitation and emission bands of the tungstate group are observed in AgGdW2O8 and AgTbW2O8 with a large Stokes shift, 12 573 and 12 387 cm(-1), respectively. Excitation and emission spectra of AgLnW(2)O(8) (Ln = Eu, Gd and Tb) show that energy transfer from the tungstate to EU3+, Gd3+ and Tb3+ occurs and that Eu3+ ions occupy a single crystallographic site with the C-2 Site symmetry. (C) 1997 Elsevier Science Ltd. All rights reserved.

引用

页码：105 / 110

页数：6

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