Preparation and thermo-physical properties of La1-xNdxMgAl11O19 (x=0, 0.1, 0.2) ceramics

被引：29
|
作者：
Wang, Yuan-Hong [1 ]
Ouyang, Jia-Hu [1 ]
Liu, Zhan-Guo [1 ]
机构：
[1] Harbin Inst Technol, Dept Mat Sci, Inst Adv Ceram, Harbin 150001, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 485卷 / 1-2期
关键词：
La1-xNdxMgAl11O19; Coprecipitation-calcination method; Thermal conductivity; Thermal expansion; BARRIER COATINGS; LANTHANUM HEXAALUMINATE; CONDUCTIVITY; OXIDES;
D O I：
10.1016/j.jallcom.2009.06.068
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
La1-xNdxMgAl11O19 (x = 0, 0.1, 0.2) ceramic powders were synthesized by chemical-coprecipitation and calcination method, and were then pressureless-sintered at 1700 degrees C for 10 h in air to fabricate dense bulk materials. La1-xNdxMgAl11O19 ceramics were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The thermal expansion coefficients (TECs) and thermal diffusivity coefficients of La1-xNdxMgAl11O19 ceramics were studied with a high-temperature dilatometer and a laser flash diffusivity technique from room temperature up to 1200 degrees C. La1-xNdxMgAl11O19 (x = 0, 0.1, 0.2) ceramics exhibited a defect magnetoplumbite structure. The TECs of LaMgAl11O19 and La0.8Nd0.2MgAl11O19 are 8.49 x 10(-6) K-1 and 8.58 x 10(-6) K-1 at 1200 degrees C. respectively. The thermal conductivity of La1-xNdxMgAl11O19 (x = 0, 0.1, 0.2) ceramics locates in the range of 2.62-3.87 W m(-1) K-1 from room temperature to 1200 degrees C (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：734 / 738
页数：5
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