Phase Structure Evolution and Thermo-Physical Properties of Nonstoichiometry Nd2-xZr2+xO7+x/2 Pyrochlore Ceramics

被引：60
作者：
Guo, Lei [1 ,2 ]
Zhang, Yu [1 ,2 ]
Ye, Fuxing [1 ,2 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China
[2] Tianjin Univ, Tianjin Key Lab Adv Joining Technol, Tianjin 300072, Peoples R China
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2015年 / 98卷 / 03期
关键词：
THERMOPHYSICAL PROPERTIES; MECHANICAL-PROPERTIES; RAMAN-SPECTROSCOPY; CONDUCTIVITY; STABILITY; OXIDES; DISORDER; COATINGS; GD; SM;
D O I：
10.1111/jace.13374
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Nonstoichiometry pyrochlore composites of Nd2-xZr2+xO7+x/2 (x=0, 0.1, 0.2) were synthesized by chemical-coprecipitation and calcination method. The phase structure evolution and thermo-physical properties of Nd2-xZr2+xO7+x/2 were investigated. Structural analysis by Raman spectroscopy showed that Nd2-xZr2+xO7+x/2 underwent an ordering degree decrease and a lattice distortion increase with increasing x value. Nd1.9Zr2.1O7.05 and Nd1.8Zr2.2O7.1 exhibited lower thermal conductivities than Nd2Zr2O7, which might be related to the lower ordering degree and the enhanced phonon scattering due to lattice distortion. As ZrO2 content increasing, the thermal expansion coefficients of Nd2-xZr2+xO7+x/2 increased, which possibly arised from the decreased crystal energy due to reduced ordering degree.
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页码：1013 / 1018
页数：6
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