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Thermal expansion performance and intrinsic lattice thermal conductivity of ferroelastic RETaO 4 ceramics
Author(s) -
Chen Lin,
Hu Mingyu,
Wu Peng,
Feng Jing
Publication year - 2019
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.16328
Subject(s) - materials science , thermal expansion , ceramic , thermal conductivity , debye model , modulus , composite material , thermal conduction , thermal , lattice (music) , condensed matter physics , thermodynamics , physics , acoustics
Ferroelastic RETaO 4 ceramics are promising thermal barrier coatings (TBCs) because of their attractive thermomechanical properties. The influence of crystal structure distortion degree on thermomechanical properties of RETaO 4 is estimated in this work. The relationship between Young's modulus and TECs is determined. The highest TECs (10.7 × 10 −6 K −1 , 1200°C) of RETaO 4 are detected in ErTaO 4 ceramics and are ascribed to its small Young's modulus and low Debye temperature. The intrinsic lattice thermal conductivity (3.94‐1.26 W m −1 K −1 , 100‐900°C) of RETaO 4 deceases with increasing of temperature due to an elimination in thermal radiation effects. The theoretical minimum thermal conductivity (1.00 W m −1 K −1 ) of RETaO 4 indicates that the experimental value is able to be reduced further. We have delved deeply into the thermomechanical properties of ferroelastic RETaO 4 ceramics and have emphasized their high‐temperature applications as TBCs.