Effects of Ca2+-Sr2+ doping on the infrared emissivity of LaCrO3

被引：38

作者：

Liu, Ling ^{[1
,2
,3
]}

Zhang, Shuyu ^{[1
,2
]}

Ma, Zhuang ^{[1
,2
,3
]}

Zhu, Shizhen ^{[1
,2
]}

机构：

[1] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China

[2] Natl Key Lab Sci & Technol Mat Shock & Impact, Beijing 100081, Peoples R China

[3] Beijing Inst Technol, Chongqing Innovat Ctr, Chongqing 401120, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2020年 / 46卷 / 12期

基金：

中国国家自然科学基金;

关键词：

Infrared emissivity; LaCrO3; Ca2+-Sr2+ doping; Perovskite; TEMPERATURE; MICROSTRUCTURE;

D O I：

10.1016/j.ceramint.2020.04.296

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：

LaCrO3 shows excellent thermal stability and good emissivity, and can be used as a potential thermal protection material for hypersonic vehicle. In this study, LaCrO3 and Ca2+-Sr2+ doped LaCrO3 were prepared by solid state reaction at 1400 degrees C for 2 h. The microstructures of the samples and effects of Ca2+-Sr2+ doping on the infrared emissivity of LaCrO3 were studied by XRD, XPS, FT-IR, and UV-VIS-NIR spectrophotometer. The results show that after doping Ca2+ and Sr2+ ions, the infrared emissivity of all samples has significantly improved at 2.5-10 mu m, from 0.61 (minimum value) to above 0.90. In the range of 10-14 mu m, the emissivity of pure LaCrO3 and La0.8CaxSr0.2-xCrO3 samples shows a similar trend and all remains above 0.97. Therefore, doping Ca2+ and Sr2+ can significantly increase the emissivity of LaCrO3 at 2.5-10 mu m which makes it have a wider application prospect in the field of high temperature thermal protection.

引用

页码：19738 / 19742

页数：5

共 21 条

[1] Quantitative evaluation of emission properties and thermal hysteresis in the mid-infrared for a single thin film of vanadium dioxide on a silicon substrate [J].