Synthesis and characterization of metal tungstates by novel solid-state metathetic approach

被引：130

作者：

Parhi, Purnendu ^{[1
]}

Karthik, T. N. ^{[1
]}

Manivannan, V. ^{[1
]}

机构：

[1] Colorado State Univ, Dept Mech Engn, Ft Collins, CO 80523 USA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2008年 / 465卷 / 1-2期

关键词：

Ceramics; Solid-state reaction; Scanning electron microscopy; X-ray diffraction;

D O I：

10.1016/j.jallcom.2007.10.089

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Novel solid state metathetic approach (SSM) (ACl(2) + Na2WO4 -> AWO(4) + 2NaCl, A = Ca, Sr, Ba, Zn, Mn, Ni) assisted by microwave energy has been successfully applied to the synthesis of tungstates of scheelite- and wolframite-type that are of technological importance. Well crystalline phases of scheelite-type tungstates, MWO4 (M = Ca, Sr, Ba) have been synthesized where the characteristics of SSM reaction and the formation of high lattice energy by-product NaCl drives the reaction toward completion. Among wolframite-type tungstates, single-phase ZnWO4 is synthesized by SSM reactions at ambient conditions and MWO4 (M = Ni, Mn) are synthesized after subjecting the amorphous product to moderate temperature of heating (around 500 degrees C for 6 h). This alternative method of synthesis where the metathesis reactions proceed in solid state has features like: simple method of synthesis, cost-effectiveness, high yield, easy scale up, and thus has advantages over already known methods of synthesis. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：380 / 386

页数：7

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