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Potential thermal barrier coating materials: RE 3 NbO 7 ( RE =La, Nd, Sm, Eu, Gd, Dy) ceramics
Author(s) -
Chen Lin,
Wu Peng,
Song Peng,
Feng Jing
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15798
Subject(s) - natural bond orbital , materials science , raman spectroscopy , ionic radius , ceramic , analytical chemistry (journal) , thermal barrier coating , thermal conductivity , thermal stability , ionic conductivity , mineralogy , crystallography , chemistry , density functional theory , ion , computational chemistry , composite material , physics , organic chemistry , electrode , chromatography , optics , electrolyte
In this work, RE 3 NbO 7 ceramics are synthesized via solid‐state reaction and the phase structure is characterized by X‐ray diffraction and Raman spectroscopy. The relationship between crystal structure and thermophysical properties is determined. Except Sm 3 NbO 7 , each RE 3 NbO 7 exhibits excellent high‐temperature phase stability. The thermal expansion coefficients increase with the decreasing RE 3+ ionic radius, which depends on the decreasing crystal lattice energy and the maximum value reaches 11.0 × 10 −6 K −1 at 1200°C. The minimum thermal conductivity of RE 3 NbO 7 reaches 1.0 W m −1 K −1 and the glass‐like thermal conductivity of Dy 3 NbO 7 is dominant by the high concentration of oxygen vacancy and the local structural order. The outstanding thermophysical properties pronounce that RE 3 NbO 7 ceramics are potential thermal barrier coating materials.
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