Dual-phase rare-earth-zirconate high-entropy ceramics with glass-like thermal conductivity

Jiatong Zhu; Xuanyu Meng; Ping Zhang; Zhuolun Li; Jie Xu; Michael J. Reece; Feng Gao

doi:10.1016/j.jeurceramsoc.2020.11.047

Dual-phase rare-earth-zirconate high-entropy ceramics with glass-like thermal conductivity

Jiatong Zhu
, Xuanyu Meng
, Ping Zhang
, Zhuolun Li
, Jie Xu
, Michael J. Reece
, Feng Gao

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian
Queen Mary University of London

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

199 Scopus citations

Abstract

A series of rare earth zirconates (RE₂Zr₂O₇) high-entropy ceramics with single- and dual-phase structure were prepared. Compared with La₂Zr₂O₇ and Yb₂Zr₂O₇, the smaller “rattling” ions (Yb³⁺, Er³⁺, Y³⁺) have been incorporated into pyrochlore lattice in (La_0.2Nd_0.2Y_0.2Er_0.2Yb_0.2)₂Zr₂O₇ (LNYEY) while larger ions (La³⁺, Nd³⁺, Sm³⁺, Eu³⁺) incorporated into fluorite lattice in (La_0.2Nd_0.2Sm_0.2Gd_0.2Yb_0.2)₂Zr₂O₇ (LNSGY). Due to high-entropy lattice distortion and resonant scattering derived from smaller ions Yb³⁺, Er³⁺, and Y³⁺, LNYEY shows a lower glass-like thermal conductivity (1.62-1.59 W m^-1 K^-1, 100-600℃) than LNSGY (1.74-1.75 W m^-1 K^-1, 100-600℃). Moreover, LNYEY and LNSGY exhibit enhanced Vickers’ hardness (LNYEY, H_v = 11.47 ± 0.41 GPa; LNSGY, H_v = 10.96 ± 0.26 GPa) and thermal expansion coefficients (LNYEY, 10.45 × 10^-6 K^-1, 1000℃; LNSGY, 11.02 × 10^-6 K^-1, 1000℃). These results indicate that dual-phase rare-earth-zirconate high-entropy ceramics could be desirable for thermal barrier coatings.

Original language	English
Pages (from-to)	2861-2869
Number of pages	9
Journal	Journal of the European Ceramic Society
Volume	41
Issue number	4
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2020.11.047
State	Published - Apr 2021

Keywords

dual-phase structure
glass-like thermal conductivity
high-entropy ceramics
rare earth zirconates
thermal barrier coatings

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10.1016/j.jeurceramsoc.2020.11.047

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@article{3b7e638a2180409183ded013fa2ff72d,

title = "Dual-phase rare-earth-zirconate high-entropy ceramics with glass-like thermal conductivity",

abstract = "A series of rare earth zirconates (RE2Zr2O7) high-entropy ceramics with single- and dual-phase structure were prepared. Compared with La2Zr2O7 and Yb2Zr2O7, the smaller {\textquotedblleft}rattling{\textquotedblright} ions (Yb3+, Er3+, Y3+) have been incorporated into pyrochlore lattice in (La0.2Nd0.2Y0.2Er0.2Yb0.2)2Zr2O7 (LNYEY) while larger ions (La3+, Nd3+, Sm3+, Eu3+) incorporated into fluorite lattice in (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 (LNSGY). Due to high-entropy lattice distortion and resonant scattering derived from smaller ions Yb3+, Er3+, and Y3+, LNYEY shows a lower glass-like thermal conductivity (1.62-1.59 W m-1 K-1, 100-600℃) than LNSGY (1.74-1.75 W m-1 K-1, 100-600℃). Moreover, LNYEY and LNSGY exhibit enhanced Vickers{\textquoteright} hardness (LNYEY, Hv = 11.47 ± 0.41 GPa; LNSGY, Hv = 10.96 ± 0.26 GPa) and thermal expansion coefficients (LNYEY, 10.45 {\texttimes} 10-6 K-1, 1000℃; LNSGY, 11.02 {\texttimes} 10-6 K-1, 1000℃). These results indicate that dual-phase rare-earth-zirconate high-entropy ceramics could be desirable for thermal barrier coatings.",

keywords = "dual-phase structure, glass-like thermal conductivity, high-entropy ceramics, rare earth zirconates, thermal barrier coatings",

author = "Jiatong Zhu and Xuanyu Meng and Ping Zhang and Zhuolun Li and Jie Xu and Reece, \{Michael J.\} and Feng Gao",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",

year = "2021",

month = apr,

doi = "10.1016/j.jeurceramsoc.2020.11.047",

language = "英语",

volume = "41",

pages = "2861--2869",

journal = "Journal of the European Ceramic Society",

issn = "0955-2219",

publisher = "Elsevier B.V.",

number = "4",

}

TY - JOUR

T1 - Dual-phase rare-earth-zirconate high-entropy ceramics with glass-like thermal conductivity

AU - Zhu, Jiatong

AU - Meng, Xuanyu

AU - Zhang, Ping

AU - Li, Zhuolun

AU - Xu, Jie

AU - Reece, Michael J.

AU - Gao, Feng

PY - 2021/4

Y1 - 2021/4

N2 - A series of rare earth zirconates (RE2Zr2O7) high-entropy ceramics with single- and dual-phase structure were prepared. Compared with La2Zr2O7 and Yb2Zr2O7, the smaller “rattling” ions (Yb3+, Er3+, Y3+) have been incorporated into pyrochlore lattice in (La0.2Nd0.2Y0.2Er0.2Yb0.2)2Zr2O7 (LNYEY) while larger ions (La3+, Nd3+, Sm3+, Eu3+) incorporated into fluorite lattice in (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 (LNSGY). Due to high-entropy lattice distortion and resonant scattering derived from smaller ions Yb3+, Er3+, and Y3+, LNYEY shows a lower glass-like thermal conductivity (1.62-1.59 W m-1 K-1, 100-600℃) than LNSGY (1.74-1.75 W m-1 K-1, 100-600℃). Moreover, LNYEY and LNSGY exhibit enhanced Vickers’ hardness (LNYEY, Hv = 11.47 ± 0.41 GPa; LNSGY, Hv = 10.96 ± 0.26 GPa) and thermal expansion coefficients (LNYEY, 10.45 × 10-6 K-1, 1000℃; LNSGY, 11.02 × 10-6 K-1, 1000℃). These results indicate that dual-phase rare-earth-zirconate high-entropy ceramics could be desirable for thermal barrier coatings.

AB - A series of rare earth zirconates (RE2Zr2O7) high-entropy ceramics with single- and dual-phase structure were prepared. Compared with La2Zr2O7 and Yb2Zr2O7, the smaller “rattling” ions (Yb3+, Er3+, Y3+) have been incorporated into pyrochlore lattice in (La0.2Nd0.2Y0.2Er0.2Yb0.2)2Zr2O7 (LNYEY) while larger ions (La3+, Nd3+, Sm3+, Eu3+) incorporated into fluorite lattice in (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 (LNSGY). Due to high-entropy lattice distortion and resonant scattering derived from smaller ions Yb3+, Er3+, and Y3+, LNYEY shows a lower glass-like thermal conductivity (1.62-1.59 W m-1 K-1, 100-600℃) than LNSGY (1.74-1.75 W m-1 K-1, 100-600℃). Moreover, LNYEY and LNSGY exhibit enhanced Vickers’ hardness (LNYEY, Hv = 11.47 ± 0.41 GPa; LNSGY, Hv = 10.96 ± 0.26 GPa) and thermal expansion coefficients (LNYEY, 10.45 × 10-6 K-1, 1000℃; LNSGY, 11.02 × 10-6 K-1, 1000℃). These results indicate that dual-phase rare-earth-zirconate high-entropy ceramics could be desirable for thermal barrier coatings.

KW - dual-phase structure

KW - glass-like thermal conductivity

KW - high-entropy ceramics

KW - rare earth zirconates

KW - thermal barrier coatings

UR - https://www.scopus.com/pages/publications/85097449959

U2 - 10.1016/j.jeurceramsoc.2020.11.047

DO - 10.1016/j.jeurceramsoc.2020.11.047

M3 - 文章

AN - SCOPUS:85097449959

SN - 0955-2219

VL - 41

SP - 2861

EP - 2869

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 4

ER -

Dual-phase rare-earth-zirconate high-entropy ceramics with glass-like thermal conductivity

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