Zirconium tungstate hydroxide hydrate revisited: Crystallization dependence on halide and hydronium ions

被引：18

作者：

Colin, Julie A. ^{[1
]}

Camper, DeMarco V. ^{[1
]}

Gates, Stacy D. ^{[1
]}

Simon, Monty D. ^{[1
]}

Witker, Karen L. ^{[1
]}

Lind, Cora ^{[1
]}

机构：

[1] Univ Toledo, Dept Chem, Toledo, OH 43606 USA

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2007年 / 180卷 / 12期

基金：

美国国家科学基金会;

关键词：

zirconium tungstate hydroxide hydrate; crystallization; hydrothermal; kinetics; new polymorph;

D O I：

10.1016/j.jssc.2007.10.012

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The formation of zirconium tungstate hydroxide hydrate, a precursor to the negative thermal expansion material cubic zirconium tungstate. shows a strong dependence on hydrothermal reaction conditions. It was found that not only the acid concentration, but also the acid counterion plays a significant role in the crystallization of ZrW2O7(OH)(2) center dot 2H(2)O. High temperatures, high acid concentrations, and the presence of chloride or bromide ions promote the formation of well-crystallized ZrW2O7(OH)(2)center dot 2H(2)O. For low acid concentrations, a new zirconium tungstate hydrate polymorph is observed, which transforms to tetragonal ZrW2O7(OH)(2)center dot 2H(2)O at longer reaction times. A study of crvstallization kinetics in hydrochloric acid is presented. (C) 2007 Elsevier Inc. All rights reserved.

引用

页码：3504 / 3509

页数：6

共 29 条

[1] Synthesis, structure and thermal contraction of a new low-temperature polymorph of ZrMo2O8 [J].