Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 883, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.160848
Keywords
Thermal barrier coatings; Oxide ceramics; Glass-like thermal conductivity; Thermal expansion coefficient; Mechanical properties
Categories
Funding
- Human Resources Program in Energy Technology [20194030202450]
- Korea Institute of Energy Technology Evaluation and Planning from the Ministry of Trade, Industry and Energy (MOTIE), Republic of Korea [20193310100060]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20193310100060] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The study investigated the effects of substituting A and B cations in A3BO7 compounds on their thermophysical properties by imposing a significant mass difference on the substituents. YYNT ceramics exhibited low thermal conductivity and excellent thermophysical properties, making them promising candidates for new thermal barrier materials.
The effects of substituting A and B cations in A3BO7 compounds on their thermophysical properties were studied by imposing a significant mass difference on the substituents. Specifically, (Yb1-xYx)3(Nb1-yTay)O7 (YYNT) ceramics were synthesized, and their structural characteristics were investigated. All the YYNT ceramics had defective fluorite structures and exhibited glass-like low thermal conductivity (1.19 W/m K at 25 degrees C), which was derived from the highly distorted crystal structure and cation substitution. In addition, their excellent thermophysical properties, such as compatible thermal expansion, high elastic modulus, and hardness, make them promising candidates for new thermal barrier materials. (c) 2021 Elsevier B.V. All rights reserved.
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