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Y 3− x Er x Al 5 O 12 Aluminate Ceramics: Preparation, Thermal Properties and Theoretical Model of Thermal Conductivity
Author(s) -
Liu YanGai,
Peng Peng,
Fang Minghao,
Huang Zhaohui
Publication year - 2012
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201100122
Subject(s) - thermal conductivity , materials science , aluminate , ceramic , thermal barrier coating , thermal expansion , phonon scattering , mineralogy , thermal , phonon , atom (system on chip) , composite material , analytical chemistry (journal) , thermodynamics , condensed matter physics , chemistry , physics , chromatography , cement , computer science , embedded system
Rare‐earth aluminate ceramics for thermal‐barrier coatings (TBCs) are synthesized. The Young's modulus and thermal properties decrease with erbium additive increasing. The Y 3− x Er x Al 5 O 12 ceramics (x = 1, 3) possess a much‐lower thermal conductivity compared with 8YSZ. The lower Young's modulus and thermal‐expansion coefficient are due to the larger atomic weight of the Er substitutional atom. Additional phonon‐scattering effects also contribute to the lower thermal conductivity. The results indicate that Y 3− x Er x Al 5 O 12 can be explored as a candidate material for TBC systems. A theoretical model that describes the influence of point defects on the thermal conductivity is discussed.