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In this study, Ce1-xSmxO2-x/2 ceramics were synthesized by sol–gel route and solid state sintering method. The phase structure was analyzed by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and Raman spectroscopy. The morphologies of the synthesized powders and the corresponding bulk samples were observed using scanning electron microscopy (SEM). Their thermal diffusivities and thermal expansion coefficients were measured by the laser-flash method and the pushing-rod method, respectively. Results show that pure Ce1-xSmxO2-x/2 powders with single fluorite structure are synthesized successfully, and their microstructures of the corresponding bulk samples are very dense. With the increase of Sm2O3 content, their thermal expansion coefficients decrease due to the higher electro-negativity of Sm3+ ions as compared with that of Ce4+ ions. Their thermal conductivities at 1000 ℃ lie in the range of 1.62–2.02 W/(m·K) due to the phonon scattering caused by the substituted atoms and oxygen vacancies. The Ce1-xSmxO2-x/2 ceramics can be used as ceramic candidates for novel thermal barrier coatings (TBCs).


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Ce1-xSmxO2-x/2—A novel type of ceramic material for thermal barrier coatings

Show Author's information Xiao-ge CHENaHaoming ZHANGbHong-song ZHANGb,c( )Yong-de ZHAOcGang LIb
Department of Construction Engineering, Henan Institute of Engineering, Zhengzhou 450007, China
Department of Mechanical Engineering, Henan Institute of Engineering, Zhengzhou 450007, China
Institute of Chemistry Henan Academy Sciences, Zhengzhou 450052, China

Abstract

In this study, Ce1-xSmxO2-x/2 ceramics were synthesized by sol–gel route and solid state sintering method. The phase structure was analyzed by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and Raman spectroscopy. The morphologies of the synthesized powders and the corresponding bulk samples were observed using scanning electron microscopy (SEM). Their thermal diffusivities and thermal expansion coefficients were measured by the laser-flash method and the pushing-rod method, respectively. Results show that pure Ce1-xSmxO2-x/2 powders with single fluorite structure are synthesized successfully, and their microstructures of the corresponding bulk samples are very dense. With the increase of Sm2O3 content, their thermal expansion coefficients decrease due to the higher electro-negativity of Sm3+ ions as compared with that of Ce4+ ions. Their thermal conductivities at 1000 ℃ lie in the range of 1.62–2.02 W/(m·K) due to the phonon scattering caused by the substituted atoms and oxygen vacancies. The Ce1-xSmxO2-x/2 ceramics can be used as ceramic candidates for novel thermal barrier coatings (TBCs).

Keywords:

thermal barrier coatings (TBCs), CeO2 oxides, doping, thermophyscial properties
Received: 09 April 2016 Revised: 09 June 2016 Accepted: 11 June 2016 Published: 21 August 2016 Issue date: September 2016
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Publication history
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Publication history

Received: 09 April 2016
Revised: 09 June 2016
Accepted: 11 June 2016
Published: 21 August 2016
Issue date: September 2016

Copyright

© The author(s) 2016

Acknowledgements

The authors would like to thank the financial support from the National Natural Science Foundation of China (No. U1304512), the Scientific and Technological Projects of Henan Province (No. 132102210142), the Program for Science & Technology Innovation Talents in Universities of Henan Province (No. 13HASTIT018), and the Postaldoctoral Research Sponsorship in Henan Province (No. 2014069).

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