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Advances in Applied Ceramics
Structural, Functional and Bioceramics
Volume 119, 2020 - Issue 4
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Research Articles

Effects of Nb5+ doping on thermal properties of Gd2(Zr1−xNbx)2O7+x ceramics

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Pages 212-217 | Received 10 Nov 2019, Accepted 07 Apr 2020, Published online: 23 Apr 2020
 

ABSTRACT

Pyrochlore Gd2(Zr1−xNbx)2O7+x (x = 0, 0.05, 0.1, 0.15) ceramic materials were synthesised using a high-temperature solid-state reaction method. The phase structure, thermal expansion coefficient and thermal conductivity of Gd2(Zr1−xNbx)2O7+x were investigated in this work. The results show that with the introduction of Nb2O5, Gd2(Zr1−xNbx)2O7+x ceramic materials present a cubic pyrochlore structure. Meanwhile, Gd2(Zr1−xNbx)2O7+x ceramics have clear grain boundaries. The thermal expansion coefficient of Gd2(Zr1−xNbx)2O7+x ceramic materials reduces from 11.4576 × 10−6 to 10.7919 × 10−6 K−1 (larger than 10 × 10−6 K−1), while its thermal conductivity gradually increases with the doping of Nb5+ ions. Considering their comprehensive properties, Gd2(Zr1−xNbx)2O7+x compounds may be considered as promising thermal barrier coatings materials.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [51762036].

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