Pressure-induced disordering and phase transformations in Eu2Zr2O7 pyrochlore

被引：13

作者：

Li, Hui ^{[1
,2
]}

Li, Nana ^{[3
]}

Li, Yan ^{[4
]}

Tao, Qiang ^{[1
]}

Zhao, Yongsheng ^{[1
]}

Zhu, Hongyu ^{[1
]}

Ma, Yanming ^{[1
]}

Zhu, Pinwen ^{[1
]}

Wang, Xin ^{[1
]}

机构：

[1] Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Peoples R China

[2] Guangxi Univ Nationalities, Coll Sci, Nanning, Peoples R China

[3] Ctr High Pressure Sci & Technol Adv Res, Shanghai, Peoples R China

[4] Jilin Univ, Coll Phys, Changchun, Peoples R China

来源：

HIGH PRESSURE RESEARCH | 2017年 / 37卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Pyrochlore; synchrotron radiation; Raman spectroscopy; phase transformations; THERMOPHYSICAL PROPERTIES; ELECTRICAL-CONDUCTIVITY; WASTE FORM; ZIRCONATE; STABILITY; PLUTONIUM; CRYSTAL; GD; SM; LN;

D O I：

10.1080/08957959.2017.1300886

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The structural properties of pyrochlore Eu2Zr2O7 under high pressure have been studied by using Raman spectroscopy and in situ angle-dispersive X-ray diffraction (ADXRD). The results of Raman spectra indicate that Eu2Zr2O7 undergoes a reversible structural change around 21.2GPa. The results of Rietveld refinements from in situ ADXRD data indicate that the ordered pyrochlore structure (Fd-3m) transforms to the defect-cotunnite structure (Pnma) at 26.5GPa. The phase transition is irreversible and the transformation process is mainly induced by the accumulations of anti-site defects of the cation sublattice and Frenkel defects on the anion sublattice. Besides, the <Zr-O> bonds should play a more important role than the <Eu-O> bonds in the process of the phase transformation.

引用

页码：256 / 266

页数：11

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