Anisotropic thermal expansion behavior in tetragonal Sr2M9WO6

被引：18

作者：

Achary, SN ^{[1
]}

Chakraborty, KR ^{[1
]}

Patwe, SJ ^{[1
]}

Shinde, AB ^{[1
]}

Krishna, PSR ^{[1
]}

Tyagi, AK ^{[1
]}

机构：

[1] Bhabha Atom Res Ctr, Solid State Phys Div, Appl Chem Div, Bombay 400085, Maharashtra, India

来源：

MATERIALS RESEARCH BULLETIN | 2006年 / 41卷 / 03期

关键词：

crystal structure;

D O I：

10.1016/j.materresbull.2005.07.025

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The colorless sample of Sr2MgWO6 was prepared by conventional solid-state reaction of stoichiometric amounts of SrCO3, WO3 and MgO and characterized by powder X-ray diffraction (XRD) studies. In the temperature range of 300-15 K, detailed structural studies on Sr2MgWO6 were carried out by Rietveld refinements of the observed powder neutron diffraction (ND) data. At ambient temperature Sr2MgWO6 crystallizes in tetragonal (space group I4/m) lattice with unit cell parameters: a = 5.5882(2) and c = 7.9452(7) angstrom, V = 248.11(3) angstrom(3), Z = 2. This tetragonal (I4/m) structure is retained down to 15 K. The structural analysis of the sample at different temperatures indicates no appreciable change in the Mg-O and W-O bond lengths. However, a decrease in the tilt angle is observed with increasing temperature. The negative thermal expansion of the c-axis is attributed to increasing transverse displacement amplitude of the bridging oxygen atoms along this axis. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：674 / 682

页数：9

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