K2Mo4O13 phases prepared by hydrothermal synthesis

被引：20

作者：

Eda, K ^{[1
]}

Chin, K

Sotani, N

Whittingham, MS

机构：

[1] Kobe Univ, Fac Sci, Dept Chem, Nada Ku, Kobe, Hyogo 6578501, Japan

[2] SUNY Binghamton, Mat Res Inst, Binghamton, NY 13902 USA

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2004年 / 177卷 / 03期

基金：

美国国家科学基金会;

关键词：

hydrothermal synthesis; molybdate crystal structure; K2Mo4O13;

D O I：

10.1016/j.jssc.2003.09.029

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Hydrothermal synthesis in the K-Mo oxide system was investigated as a function of the pH of the reaction medium. Four compounds were formed, including two K2Mo4O13 phases. One is a new low-temperature polymorph, which crystallizes in the orthorhombic, space group Pbca, with Z = 8 and unit cell dimensions a = 7.544(1) Angstrom, b = 15.394(2) Angstrom, c = 18.568(3) Angstrom. The other is the known triclinic K2Mo4O13, whose structure was re-determined from single crystal data; its cell parameters were determined as a = 7.976(2) Angstrom, b = 8.345(2) Angstrom, c = 10.017(2) Angstrom, alpha = 107.104(3)degrees, beta = 102.885(3)degrees, gamma = 109.760(3)degrees, which are the standard settings of the crystal lattice. The orthorhombic phase converts endothermically into triclinic phase at ca. 730 K with a heat of transition of 8.31 kJ/mol. (C) 2003 Elsevier Inc. All rights reserved.

引用

页码：916 / 921

页数：6

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