Structure, crystal chemistry and thermal evolution of the δ-Bi2O3-related phase Bi9ReO17

被引：7

作者：

Sharma, Neeraj ^{[1
]}

Withers, Ray L. ^{[2
]}

Knight, Kevin S. ^{[3
]}

Ling, Chris D. ^{[1
,4
]}

机构：

[1] Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia

[2] Australian Natl Univ, Res Sch Chem, Canberra, ACT 0200, Australia

[3] Rutherford Appleton Lab, ISIS Facil, Sci & Technol Facil Council, Didcot OX11 0QX, Oxon, England

[4] Australian Nucl Sci & Technol Org, Bragg Inst, PMB 1, Menai, NSW 2234, Australia

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2009年 / 182卷 / 09期

基金：

澳大利亚研究理事会; 英国科学技术设施理事会;

关键词：

Bismuth rhenium oxide; Delta-Bi2O3; Neutron powder diffraction; Synchrotron X-ray powder diffraction; Phase transition; Rietveld-refinement; NEUTRON POWDER DIFFRACTION; FLUORITE-RELATED PHASES; BI-RICH PART; OXIDE;

D O I：

10.1016/j.jssc.2009.07.008

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The thermal evolution and structural properties of fluorite-related delta-Bi2O3-type Bi9ReO17 were studied with variable temperature neutron powder diffraction, synchrotron X-ray powder diffraction and electron diffraction. The thermodynamically stable room-temperature crystal structure is monoclinic P2(1)/c, a = 9.89917(5), b = 19.70356(10), c = 11.61597(6) angstrom, beta = 125.302(2)degrees (R-p = 3.51%, wR(p) = 3.60%) and features clusters of ReO4 tetrahedra embedded in a distorted Bi-O fluorite-like network. This phase is stable upto 725 degrees C whereupon it transforms to a disordered delta-Bi2O3-like phase, which was modeled with delta-Bi2O3 in cubic Fm (3) over barm with a = 5.7809(1) angstrom (R-p = 2.49%, wR(p) = 2.44%) at 750 degrees C. Quenching from above 725 degrees C leads to a different phase, the structure of which has not been solved but appears on the basis of spectroscopic evidence to contain both ReO4 tetrahedra and ReO6 octahedra. Crown Copyright (C) 2009 Published by Elsevier Inc. All rights reserved.

引用

页码：2468 / 2474

页数：7