期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 35, 期 4, 页码 1297-1306出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2014.10.030
关键词
Thermal conductivity; Rare-earth; Magnetoplumbite; Phonon mean free path
资金
- National Natural Science Foundation of China (NSFC) [11232008, 51221291]
- Postdoctoral Science Foundation of China [2013M530619]
- Tsinghua University Initiative Scientific Research Program [2012THZ0]
Compounds with LnMgAl(11)O(19)-type magnetoplumbite structure have been identified as a class of promising competitors to established yttria partially stabilized zirconia (YSZ) as a thermal bather coating materials on nickel-base alloys due to their excellent thermo-physical properties and relatively low sinterability. In order to achieve better understanding of the structure/property relationships of LnMgAl(11)O(19) (Ln = La, Pr, Nd, Sm, Eu and Gd) magnetoplumbite, the direct influence of gradual variations of constituent upon therma-physical properties was conducted by analyzing the Raman spectrum and X-ray diffraction (XRD) as well as the calculated phonon mean free path. The source of low thermal conductivities was collectively contributed by the strain field fluctuation of the Ln ionic mass and distorted AlO6 octahedron influenced by the interaction with RE3+ ions as well as the intrinsic scattering in the complex crystal cell of LnMgAl(11)O(19) and the highly dense grain boundaries. (C) 2014 Elsevier Ltd. All rights reserved.
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