Structural evolution and thermal conductivities of (Gd1-xYbx)2Zr2O7 (x=0, 0.02, 0.04, 0.06, 0.08, 0.1) ceramics for thermal barrier coatings

Xizhong Wang; Lei Guo; Hailin Zhang; Shengkai Gong; Hongbo Guo

doi:10.1016/j.ceramint.2015.06.090

Structural evolution and thermal conductivities of (Gd_1-xYb_x)₂Zr₂O₇ (x=0, 0.02, 0.04, 0.06, 0.08, 0.1) ceramics for thermal barrier coatings

Xizhong Wang
, Lei Guo
, Hailin Zhang
, Shengkai Gong
, Hongbo Guo^*

^*Corresponding author for this work

School of Materials Science and Engineering

Beihang University
Tianjin University

Research output: Contribution to journal › Article › peer-review

79 Scopus citations

Abstract

(Gd_1-xYb_x)₂Zr₂O₇ (x=0, 0.02, 0.04, 0.06, 0.08, 0.1) compounds were synthesized by solid state reaction, and their phase structure and thermal conductivities were investigated. (Gd_1-xYb_x)₂Zr₂O₇ (x=0, 0.02, 0.04, 0.06) exhibited pyrochlore structure, while (Gd_1-xYb_x)₂Zr₂O₇ (x=0.08, 0.1) fluorite phase. The ordering degree of (Gd_1-xYb_x)₂Zr₂O₇ (x=0, 0.02, 0.04, 0.06) pyrochlores decreased with increasing the Yb₂O₃ content. Among the (Gd_1-xYb_x)₂Zr₂O₇ ceramics investigated, (Gd_0.94Yb_0.06)₂Zr₂O₇ yielded the lowest thermal conductivity of ~1.14 W/mk at 800 °C, which was nearly 25% lower than that of Gd₂Zr₂O₇. The structural disorder could cause the initial decrease in the thermal conductivity, and the reduced complexity of crystal structure resulting from the pyrochlore-fluorite phase transformation might contribute to the increased thermal conductivity.

Original language	English
Pages (from-to)	12621-12625
Number of pages	5
Journal	Ceramics International
Volume	41
Issue number	10
DOIs	https://doi.org/10.1016/j.ceramint.2015.06.090
State	Published - 9 Jun 2015

Keywords

(GdYb)ZrO
C. Thermal conductivity
Phase structure
Solid state reaction

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10.1016/j.ceramint.2015.06.090

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@article{83e8f934743b43d28db94b2d2f6facfd,

title = "Structural evolution and thermal conductivities of (Gd1-xYbx)2Zr2O7 (x=0, 0.02, 0.04, 0.06, 0.08, 0.1) ceramics for thermal barrier coatings",

abstract = "(Gd1-xYbx)2Zr2O7 (x=0, 0.02, 0.04, 0.06, 0.08, 0.1) compounds were synthesized by solid state reaction, and their phase structure and thermal conductivities were investigated. (Gd1-xYbx)2Zr2O7 (x=0, 0.02, 0.04, 0.06) exhibited pyrochlore structure, while (Gd1-xYbx)2Zr2O7 (x=0.08, 0.1) fluorite phase. The ordering degree of (Gd1-xYbx)2Zr2O7 (x=0, 0.02, 0.04, 0.06) pyrochlores decreased with increasing the Yb2O3 content. Among the (Gd1-xYbx)2Zr2O7 ceramics investigated, (Gd0.94Yb0.06)2Zr2O7 yielded the lowest thermal conductivity of \textasciitilde{}1.14 W/mk at 800 °C, which was nearly 25\% lower than that of Gd2Zr2O7. The structural disorder could cause the initial decrease in the thermal conductivity, and the reduced complexity of crystal structure resulting from the pyrochlore-fluorite phase transformation might contribute to the increased thermal conductivity.",

keywords = "(GdYb)ZrO, C. Thermal conductivity, Phase structure, Solid state reaction",

author = "Xizhong Wang and Lei Guo and Hailin Zhang and Shengkai Gong and Hongbo Guo",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd and Techna Group S.r.l.",

year = "2015",

month = jun,

day = "9",

doi = "10.1016/j.ceramint.2015.06.090",

language = "英语",

volume = "41",

pages = "12621--12625",

journal = "Ceramics International",

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number = "10",

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TY - JOUR

T1 - Structural evolution and thermal conductivities of (Gd1-xYbx)2Zr2O7 (x=0, 0.02, 0.04, 0.06, 0.08, 0.1) ceramics for thermal barrier coatings

AU - Wang, Xizhong

AU - Guo, Lei

AU - Zhang, Hailin

AU - Gong, Shengkai

AU - Guo, Hongbo

PY - 2015/6/9

Y1 - 2015/6/9

N2 - (Gd1-xYbx)2Zr2O7 (x=0, 0.02, 0.04, 0.06, 0.08, 0.1) compounds were synthesized by solid state reaction, and their phase structure and thermal conductivities were investigated. (Gd1-xYbx)2Zr2O7 (x=0, 0.02, 0.04, 0.06) exhibited pyrochlore structure, while (Gd1-xYbx)2Zr2O7 (x=0.08, 0.1) fluorite phase. The ordering degree of (Gd1-xYbx)2Zr2O7 (x=0, 0.02, 0.04, 0.06) pyrochlores decreased with increasing the Yb2O3 content. Among the (Gd1-xYbx)2Zr2O7 ceramics investigated, (Gd0.94Yb0.06)2Zr2O7 yielded the lowest thermal conductivity of ~1.14 W/mk at 800 °C, which was nearly 25% lower than that of Gd2Zr2O7. The structural disorder could cause the initial decrease in the thermal conductivity, and the reduced complexity of crystal structure resulting from the pyrochlore-fluorite phase transformation might contribute to the increased thermal conductivity.

AB - (Gd1-xYbx)2Zr2O7 (x=0, 0.02, 0.04, 0.06, 0.08, 0.1) compounds were synthesized by solid state reaction, and their phase structure and thermal conductivities were investigated. (Gd1-xYbx)2Zr2O7 (x=0, 0.02, 0.04, 0.06) exhibited pyrochlore structure, while (Gd1-xYbx)2Zr2O7 (x=0.08, 0.1) fluorite phase. The ordering degree of (Gd1-xYbx)2Zr2O7 (x=0, 0.02, 0.04, 0.06) pyrochlores decreased with increasing the Yb2O3 content. Among the (Gd1-xYbx)2Zr2O7 ceramics investigated, (Gd0.94Yb0.06)2Zr2O7 yielded the lowest thermal conductivity of ~1.14 W/mk at 800 °C, which was nearly 25% lower than that of Gd2Zr2O7. The structural disorder could cause the initial decrease in the thermal conductivity, and the reduced complexity of crystal structure resulting from the pyrochlore-fluorite phase transformation might contribute to the increased thermal conductivity.

KW - (GdYb)ZrO

KW - C. Thermal conductivity

KW - Phase structure

KW - Solid state reaction

UR - https://www.scopus.com/pages/publications/84955395991

U2 - 10.1016/j.ceramint.2015.06.090

DO - 10.1016/j.ceramint.2015.06.090

M3 - 文章

AN - SCOPUS:84955395991

SN - 0272-8842

VL - 41

SP - 12621

EP - 12625

JO - Ceramics International

JF - Ceramics International

IS - 10

ER -

Structural evolution and thermal conductivities of (Gd_1-xYb_x)₂Zr₂O₇ (x=0, 0.02, 0.04, 0.06, 0.08, 0.1) ceramics for thermal barrier coatings

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