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The thermophysical properties and defect chemistry of HfO2–Sm3TaO7 ceramics

Published online by Cambridge University Press:  08 July 2020

Ying Zhou Open the ORCID record for Ying Zhou [Opens in a new window] ,
Guoyou Gan ,
Zhenhua Ge ,
Jing Feng  and
Peng Song
Ying Zhou*
Affiliation:
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming650093, People's Republic of China Yunnan Provincial Academy of Science and Technology, Kunming650093, People's Republic of China
Guoyou Gan
Affiliation:
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming650093, People's Republic of China
Zhenhua Ge
Affiliation:
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming650093, People's Republic of China
Jing Feng
Affiliation:
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming650093, People's Republic of China
Peng Song
Affiliation:
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming650093, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

HfO2–Sm3TaO7 ceramics are prepared through a solid-state reaction method. The X-ray diffraction and structural refinement show that the phase structures of HfO2–Sm3TaO7 ceramics are an ordered orthorhombic phase and the space groups are belonging to Ccmm. The degree of the structural disorder increases with increasing HfO2 content. The solid solution mechanism reveals that Hf4+ exists in the form of interstitial ions that cause crystal expansion when the doping content is less than 4 mol%. When the doping concentration of HfO2 ≥ 4 mol%, the Hf4+ ions can substitute an equal number of Sm3+ and Ta5+ ions. The phase transition of Sm3TaO7 ceramics is removed with increasing HfO2 content, and the 8 mol% HfO2–Sm3TaO7 ceramics have a high thermal expansion coefficient of 10.2 × 10−6 K−1 at 1200 °C. The 2 mol% HfO2–Sm3TaO7 ceramics have the lowest thermal conductivity (1.03 W/m K at 900 °C), which is lower than previous research of the 7–8 YSZ. The outstanding thermophysical properties of HfO2–Sm3TaO7 ceramics indicate that they are potential thermal-barrier coating materials.

Keywords

HfO2–Sm3TaO7 ceramicssolid solution mechanismthermophysical properties
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 16 , 28 August 2020 , pp. 2230 - 2238
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Copyright
Copyright © Materials Research Society 2020

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