Thermophysical properties of rare earth barium aluminates

被引：16
作者：
Feng, Jing [1 ,2 ]
Zhou, Yunxuan [1 ]
Ren, Xiaorui [2 ]
Song, Peng [1 ]
Pan, Wei [2 ]
机构：
[1] Kunming Univ Sci & Technol, Fac Mat Sci & Engn, Kunming, Yunnan, Peoples R China
[2] Tsinghua Univ, Dept Mat Sci & Engn, Beijing, Peoples R China
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2018年 / 101卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Ba(6)Ln(2)Al(4)O(15) compounds; ceramic; thermal conductivity; thermal expansion coefficients; LOW-THERMAL-CONDUCTIVITY; BARRIER-COATING MATERIAL; ND; OXIDE; EU; GD; DY; LN;
D O I：
10.1111/jace.15504
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：
The super low thermal conductivity and ultrahigh thermal expansion of Ba(6)Ln(2)Al(4)O(15) (Ln = Gd, Dy, Er, and Yb) compounds with one-sixth of the oxygen vacancy have been synthesized by the solid-state reaction method. The lowest thermal conductivity of Ba6Yb2Al4O15 was found to be 0.98W/(m.K) at 1073K. The large concentration of oxygen vacancies in Ba(6)Ln(2)Al(4)O(15) compounds leads to low elastic modulus and loose chemical bonds. The average thermal expansion coefficients of Ba(6)Ln(2)Al(4)O(15) compounds was 11.8x10(-6) 13.6x10(-6) K-1. The loose chemical bonds with Young's moduli were in the range of 102.8 135.9 GPa.
引用
收藏
页码：2718 / 2723
页数：6
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