Effects of Nb5+ doping on thermal properties of Gd2(Zr1−xNbx)2O7+x ceramics. (18th May 2020)

• Record Type: Journal Article
• Authors: Jiang, Tao; Xie, Min; Wang, Xuanli; Song, Xiwen
• Is Part Of: Advances in applied ceramics. Volume 119:Number 4(2020)
• Page Start: 212
• Page End: 217
• Publication Date: 2020-05-18
• Subjects: Gd2Zr2O7 -- Nb2O5 doping -- thermal properties -- pyrochlore; Ceramics -- Periodicals; 620.1405
• DOI: 10.1080/17436753.2020.1755509
• Languages: English
• ISSNs: 1743-6753

Abstract

ABSTRACT: Pyrochlore Gd2 (Zr1− x Nb x )2 O7+ 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− x Nb x )2 O7+ x were investigated in this work. The results show that with the introduction of Nb2 O5, Gd2 (Zr1− x Nb x )2 O7+ x ceramic materials present a cubic pyrochlore structure. Meanwhile, Gd2 (Zr1− x Nb x )2 O7+ x ceramics have clear grain boundaries. The thermal expansion coefficient of Gd2 (Zr1− x Nb x )2 O7+ 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 Nb 5+ ions. Considering their comprehensive properties, Gd2 (Zr1− x Nb x )2 O7+ x compounds may be considered as promising thermal barrier coatings materials.