Thermal expansions of Ln2Zr2O7 (Ln = La, Nd, Sm, and Gd) pyrochlore

被引：49

作者：

Feng, J. ^{[1
,2
,3
]}

Xiao, B. ^{[4
]}

Zhou, R. ^{[2
]}

Pan, W. ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

[2] Kunming Univ Sci & Technol, Educ Minist China, Key Lab Adv Mat Precious Nonferrous Met, Kunming 650093, Peoples R China

[3] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA

[4] Tulane Univ, Sch Sci & Engn, Dept Phys & Engn Phys, New Orleans, LA 70118 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 111卷 / 10期

关键词：

EARTH-OXIDE PYROCHLORES; CONDUCTIVITY; SIMULATION; TI;

D O I：

10.1063/1.4722174

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The thermal expansions of the rare earth zirconate (Ln(2)Zr(2)O(7), Ln =La, Nd, Sm, and Gd) pyrochlore were studied by the Debye and quasi harmonic approximation combined with the first principles calculations. The difference between C-v and C-p was obtained. The temperature dependence of thermal expansions is mainly caused by the restoration of thermal energy due to phonon excitations at relatively a low temperature. When the temperature is much higher than Debye temperature, i.e., above 600 K for Ln(2)Zr(2)O(7) compounds, the volumetric coefficient is increased linearly by increasing the temperature. The calculations are in good agreement with the experiments. (C) 2012 American Institute of Physics. Pittp://dx.doi.org/10.1063/1.4722174]

引用

页数：4

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