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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 2/2020

19-02-2020

Influence of Y2O3 and Ta2O5 Co-doping on Microstructure and Thermal Conductivity of Gd2Zr2O7 Ceramics

Authors: Zhaolu Xue, Shuqin Wu, Lihong Qian, Eungsun Byon, Shihong Zhang

Published in: Journal of Materials Engineering and Performance | Issue 2/2020

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Abstract

Rare earth zirconates (RE2Zr2O7) are considered as a class of potential high-temperature structural materials. In this paper, a series of Y2O3 and Ta2O5 co-doped Gd2Zr2O7 [(Gd1−xYx)2(Zr1−xTax)2O7+x, x = 0, 0.1, 0.2, 0.3, 0.4] ceramics were prepared by solid-state reaction sintering in order to clarify the influence of Y2O3 and Ta2O5 co-doped on microstructure, Young’s modulus and thermal conductivity. The results showed that Y2O3 and Ta2O5 co-doped Gd2Zr2O7 exhibited a single pyrochlore structure, and a small amount of Y3+ ions were doped into the Zr4+ ions lattice. The Young’s moduli of doped Gd2Zr2O7 ceramics slightly change with the increase in Y2O3 and Ta2O5 doping concentration. The minimum thermal conductivities of the specimens were obtained at 800 °C. The thermal conductivity of doped Gd2Zr2O7 with x = 0.3 is lower than that of others among the doped specimens, which is around 1.41 W m−1 K−1 at 800 °C. In addition, (Gd0.7Y0.3)2(Zr0.7Ta0.3)2O7.3 ceramic exhibits excellent phase stability from room temperature to 1550 °C.
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Metadata
Title
Influence of Y2O3 and Ta2O5 Co-doping on Microstructure and Thermal Conductivity of Gd2Zr2O7 Ceramics
Authors
Zhaolu Xue
Shuqin Wu
Lihong Qian
Eungsun Byon
Shihong Zhang
Publication date
19-02-2020
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 2/2020
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-020-04658-4

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