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Densification, Structure, and Thermophysical Properties of Ytterbium–Gadolinium Zirconate Ceramics
Author(s) -
Liu ZhanGuo,
Ouyang JiaHu,
Zhou Yu,
Li Jing,
Xia XiaoLiang
Publication year - 2009
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2008.02289.x
Subject(s) - materials science , zirconate , ceramic , calcination , thermal conductivity , coprecipitation , yttria stabilized zirconia , cubic zirconia , gadolinium , thermal expansion , ytterbium , analytical chemistry (journal) , mineralogy , composite material , chemical engineering , doping , metallurgy , biochemistry , chemistry , optoelectronics , chromatography , engineering , titanate , catalysis
(Yb x Gd 1− x ) 2 Zr 2 O 7 (0≤ x ≤1.0) ceramic powders synthesized with the chemical‐coprecipitation and calcination method were pressureless‐sintered at 1550–1700°C to develop new thermal barrier oxides with a lower thermal conductivity than yttria‐stabilized zirconia ceramics. (Yb x Gd 1− x ) 2 Zr 2 O 7 ceramics exhibit a defective fluorite‐type structure. The linear thermal expansion coefficients of (Yb x Gd 1− x ) 2 Zr 2 O 7 ceramics increase with increasing temperature from room temperature to 1400°C. The measured thermal conductivity of (Yb x Gd 1− x ) 2 Zr 2 O 7 ceramics first gradually decrease with increasing temperature and then slightly increase above 800°C because of the increased radiation contribution. YbGdZr 2 O 7 ceramics have the lowest thermal conductivity among all the composition combinations studied.