Thermophysical properties of rare earth barium aluminates

被引：17

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

页码：2718 / 2723

页数：6

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