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HfO2 alloying effect has been applied to optimize thermal insulation performance of HoTaO4 ceramics. X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy are employed to decide the crystal structure. Scanning electronic microscopy is utilized to detect the influence of HfO2 alloying effect on microstructure. Current paper indicates that the same numbers of Ta5+ and Ho3+ ions of HoTaO4 are substituted by Hf4+ cations, and it is defined as alloying effect. No crystal structural transition is introduced by HfO2 alloying effect, and circular pores are produced in HoTaO4. HfO2 alloying effect is efficient in decreasing thermal conductivity of HoTaO4 and it is contributed to the differences of ionic radius and atomic weight between Hf4+ ions and host cations (Ta5+ and Ho3+). The least experimental thermal conductivity is 0.8 W·K-1·m-1 at 900 ℃, which is detected in 6 and 9 mol%-HfO2 HoTaO4 ceramics. The results imply that HfO2-HoTaO4 ceramics are promising thermal barrier coatings (TBCs) due to their extraordinary thermal insulation performance.


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Influence of HfO2 alloying effect on microstructure and thermal conductivity of HoTaO4 ceramics

Show Author's information Lin CHENJing FENG( )
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

Abstract

HfO2 alloying effect has been applied to optimize thermal insulation performance of HoTaO4 ceramics. X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy are employed to decide the crystal structure. Scanning electronic microscopy is utilized to detect the influence of HfO2 alloying effect on microstructure. Current paper indicates that the same numbers of Ta5+ and Ho3+ ions of HoTaO4 are substituted by Hf4+ cations, and it is defined as alloying effect. No crystal structural transition is introduced by HfO2 alloying effect, and circular pores are produced in HoTaO4. HfO2 alloying effect is efficient in decreasing thermal conductivity of HoTaO4 and it is contributed to the differences of ionic radius and atomic weight between Hf4+ ions and host cations (Ta5+ and Ho3+). The least experimental thermal conductivity is 0.8 W·K-1·m-1 at 900 ℃, which is detected in 6 and 9 mol%-HfO2 HoTaO4 ceramics. The results imply that HfO2-HoTaO4 ceramics are promising thermal barrier coatings (TBCs) due to their extraordinary thermal insulation performance.

Keywords:

thermal barrier coating (TBC), thermal conductivity, rare earth tantalates, microstructure, alloying effect, optical property
Received: 25 March 2019 Revised: 22 April 2019 Accepted: 23 April 2019 Published: 04 December 2019 Issue date: December 2019
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Publication history
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Publication history

Received: 25 March 2019
Revised: 22 April 2019
Accepted: 23 April 2019
Published: 04 December 2019
Issue date: December 2019

Copyright

© The author(s) 2019

Acknowledgements

This research is under the support of the National Natural Science Foundation of China (No. 51762028) and Materials Genome Engineering of Rare and Precious Metal of Yunnan Province (No. 2018ZE019).

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