High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials

Abstract High-entropy pyrochlore-type structures based on rare-earth zirconates are successfully produced by conventional solid-state reaction method. Six rare-earth oxides (La2O3, Nd2O3, Sm2O3, Eu2O3, Gd2O3, and Y2O3) and ZrO2 are used as the raw powders. Five out of the six rare-earth oxides with...

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Main Authors:	Fei Li, Lin Zhou, Ji-Xuan Liu, Yongcheng Liang, Guo-Jun Zhang
Format:	Article
Language:	English
Published:	SpringerOpen 2019-07-01
Series:	Journal of Advanced Ceramics
Subjects:	thermal barrier coating (TBC) pyrochlore high-entropy ceramics thermal conductivity
Online Access:	http://link.springer.com/article/10.1007/s40145-019-0342-4

id	doaj-9739f09fddd345df87689621c492bf52
record_format	Article
spelling	doaj-9739f09fddd345df87689621c492bf522020-11-25T03:55:54ZengSpringerOpenJournal of Advanced Ceramics2226-41082227-85082019-07-018457658210.1007/s40145-019-0342-4High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materialsFei Li0Lin Zhou1Ji-Xuan Liu2Yongcheng Liang3Guo-Jun Zhang4State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, College of Science, Donghua UniversityState Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, College of Science, Donghua UniversityState Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, College of Science, Donghua UniversityState Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, College of Science, Donghua UniversityState Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, College of Science, Donghua UniversityAbstract High-entropy pyrochlore-type structures based on rare-earth zirconates are successfully produced by conventional solid-state reaction method. Six rare-earth oxides (La2O3, Nd2O3, Sm2O3, Eu2O3, Gd2O3, and Y2O3) and ZrO2 are used as the raw powders. Five out of the six rare-earth oxides with equimolar ratio and ZrO2 are mixed and sintered at different temperatures for investigating the reaction process. The results demonstrate that the high-entropy pyrochlores (5RE1/5)2Zr2O7 have been formed after heated at 1000°C. The (5RE1/5)2Zr2O7 are highly sintering resistant and possess excellent thermal stability. The thermal conductivities of the (5RE1/5)2Zr2O7 high-entropy ceramics are below 1 W·m–1·K–1 in the temperature range of 300–1200°C. The (5RE1/5)2Zr2O7 can be potential thermal barrier coating materials.http://link.springer.com/article/10.1007/s40145-019-0342-4thermal barrier coating (TBC)pyrochlorehigh-entropy ceramicsthermal conductivity
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Fei Li Lin Zhou Ji-Xuan Liu Yongcheng Liang Guo-Jun Zhang
spellingShingle	Fei Li Lin Zhou Ji-Xuan Liu Yongcheng Liang Guo-Jun Zhang High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials Journal of Advanced Ceramics thermal barrier coating (TBC) pyrochlore high-entropy ceramics thermal conductivity
author_facet	Fei Li Lin Zhou Ji-Xuan Liu Yongcheng Liang Guo-Jun Zhang
author_sort	Fei Li
title	High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials
title_short	High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials
title_full	High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials
title_fullStr	High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials
title_full_unstemmed	High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials
title_sort	high-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials
publisher	SpringerOpen
series	Journal of Advanced Ceramics
issn	2226-4108 2227-8508
publishDate	2019-07-01
description	Abstract High-entropy pyrochlore-type structures based on rare-earth zirconates are successfully produced by conventional solid-state reaction method. Six rare-earth oxides (La2O3, Nd2O3, Sm2O3, Eu2O3, Gd2O3, and Y2O3) and ZrO2 are used as the raw powders. Five out of the six rare-earth oxides with equimolar ratio and ZrO2 are mixed and sintered at different temperatures for investigating the reaction process. The results demonstrate that the high-entropy pyrochlores (5RE1/5)2Zr2O7 have been formed after heated at 1000°C. The (5RE1/5)2Zr2O7 are highly sintering resistant and possess excellent thermal stability. The thermal conductivities of the (5RE1/5)2Zr2O7 high-entropy ceramics are below 1 W·m–1·K–1 in the temperature range of 300–1200°C. The (5RE1/5)2Zr2O7 can be potential thermal barrier coating materials.
topic	thermal barrier coating (TBC) pyrochlore high-entropy ceramics thermal conductivity
url	http://link.springer.com/article/10.1007/s40145-019-0342-4
work_keys_str_mv	AT feili highentropypyrochloreswithlowthermalconductivityforthermalbarriercoatingmaterials AT linzhou highentropypyrochloreswithlowthermalconductivityforthermalbarriercoatingmaterials AT jixuanliu highentropypyrochloreswithlowthermalconductivityforthermalbarriercoatingmaterials AT yongchengliang highentropypyrochloreswithlowthermalconductivityforthermalbarriercoatingmaterials AT guojunzhang highentropypyrochloreswithlowthermalconductivityforthermalbarriercoatingmaterials
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High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials

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