Investigating the order-disorder phase transition in Nd2-xYxZr2O7 via diffraction and spectroscopy

被引：33

作者：

Blanchard, Peter E. R. ^{[1
]}

Liu, Samuel ^{[1
]}

Kennedy, Brendan J. ^{[1
]}

Ling, Chris D. ^{[1
]}

Zhang, Zhaoming ^{[2
]}

Avdeev, Maxim ^{[2
]}

Cowie, Bruce C. C. ^{[3
]}

Thomsen, Lars ^{[3
]}

Jang, Ling-Yun ^{[4
]}

机构：

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

[2] Australian Nucl Sci & Technol Org, Lucas Heights, NSW 2234, Australia

[3] Australian Synchrotron, Clayton, Vic 3168, Australia

[4] Natl Synchrotron Radiat Res Ctr, Expt Facil Div, Facil Utilizat Grp, Hsinchu 30076, Taiwan

来源：

DALTON TRANSACTIONS | 2013年 / 42卷 / 41期

基金：

澳大利亚研究理事会;

关键词：

X-RAY-ABSORPTION; FLUORITE TRANSITION; RAMAN-SPECTROSCOPY; PYROCHLORE; FILMS; TRANSFORMATION; CONDUCTIVITY; A(2)B(2)O(7); PERFORMANCE; ZIRCONIUM;

D O I：

10.1039/c3dt51420j

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The pyrochlore-defect fluorite phase transition in the mixed-metal zirconate Nd2-xYxZr2O7 (0 <= x <= 2) solid solution was investigated using synchrotron X-ray and neutron diffraction, as well as X-ray absorption spectroscopy. Diffraction analysis revealed a two-phase region between 1.0 <= x <= 1.2. In the pyrochlore phase, Zr L-3-edge XANES analysis demonstrated a gradual change in the local coordination environment of the B site with increasing Y content that was consistent with an increase in disorder. Although Y L-3-edge XANES analysis suggested that the Y cations remained in an ordered coordination environment in the pyrochlore phase, disorder did gradually increase once the fluorite phase formed. It was found that Y cations prefer an ordered coordination environment near the phase boundary whereas Zr cations prefer a disordered coordination environment.

引用

页码：14875 / 14882

页数：8

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