Effect of cation substitution on thermophysical properties of fluorite A3BO7 ceramics

Song, Dowon; Kim, Junseong; Lyu, Guanlin; Pyeon, Janghyeok; Jeon, Hak-Beom; Oh, Yoon-Suk; Song, Taeseup; Paik, Ungyu; Jung, Yeon-Gil

doi:10.1016/j.jallcom.2021.160848

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Effect of cation substitution on thermophysical properties of fluorite A3BO7 ceramics

Song, Dowon;
Kim, Junseong;
Lyu, Guanlin;
Pyeon, Janghyeok;
Jeon, Hak-Beom;
... Song, Taeseup;
외 3명

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18

초록

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 °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.

키워드

Glass-like thermal conductivity; Mechanical properties; Oxide ceramics; Thermal barrier coatings; Thermal expansion coefficient; BOND-LENGTH DISTRIBUTIONS; THERMAL BARRIER COATINGS; PHASE-TRANSFORMATIONS; COMPLEX PEROVSKITES; CONDUCTIVITY; TRANSITION; EXPANSION; ZIRCONATE; EU; GD

제목: Effect of cation substitution on thermophysical properties of fluorite A3BO7 ceramics

저자: Song, Dowon; Kim, Junseong; Lyu, Guanlin; Pyeon, Janghyeok; Jeon, Hak-Beom; Oh, Yoon-Suk; Song, Taeseup; Paik, Ungyu; Jung, Yeon-Gil

DOI: 10.1016/j.jallcom.2021.160848

발행일: 2021-11

유형: 정기학술지(Article(Perspective Article포함))

저널명: Journal of Alloys and Compounds

권: 883

페이지: 1 ~ 7