The fluorite-pyrochlore transformation of Ho2-yNdyZr2O7

被引：42

作者：

Clements, Richard ^{[1
,2
]}

Hester, James R. ^{[2
]}

Kennedy, Brendan J. ^{[1
]}

Ling, Chris D. ^{[2
]}

Stampfl, Anton P. J. ^{[1
,2
]}

机构：

[1] Australian Nucl Sci & Technol Org, Bragg Inst, Lucas Heights, NSW 2234, Australia

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

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2011年 / 184卷 / 08期

基金：

澳大利亚研究理事会;

关键词：

Pyrochlore structure; Fluorite structure; Oxide pyrochlores; Defect chemistry; Disorder transformation; Neutron diffraction; X-RAY-DIFFRACTION; ORDER-DISORDER TRANSITION; POWDER DIFFRACTION; RAMAN-SPECTROSCOPY; CRYSTAL-CHEMISTRY; OXIDE PYROCHLORES; SYSTEM; A(2)B(2)O(7); CONDUCTIVITY; SYNCHROTRON;

D O I：

10.1016/j.jssc.2011.05.054

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Twelve members of the Ho2-yNdyZr2O7 series, prepared using conventional solid state methods, have been characterised by neutron powder diffraction. Ho2Zr2O7 has a defect fluorite structure whereas Nd2Zr2O7 is found to adopt the ordered pyrochlore structure with the composition induced fluorite-pyrochlore transformation occurring near y=1. Rietveld analysis on the neutron data for all the compositions reveals an increase in lattice parameter as a function of y across the entire series, with a small discontinuity associated with the transformation. The neutron profile results suggest that domains of pyrochlore-type initially begin to form before crystallising into a separate phase, and therefore that anion and cation ordering processes are distinct. There is a strong correlation between the extent of disorder in the anion sublattice and the x-parameter of 48f oxygen. These results point the way to a better understanding of the stability observed in pyrochlore structures. (C) 2011 Elsevier Inc. All rights reserved.

引用

页码：2108 / 2113

页数：6

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