Preparation and thermal properties of Sm2AlTaO7

• Published in: Cogent physics Vol. 3; no. 1
• Main Authors: Haipeng, Yu, Xiaoge, Chen, Hongsong, Zhang, Haoming, Zhang, Yongde, Zhao, Yanxu, Liu, An, Tang
• Format: Journal Article
• Language: English
• Published: Abingdon Cogent 31.12.2016; Taylor & Francis Ltd
• Subjects: AlTaO; Ceramic coatings; Chemical synthesis; Heat conductivity; Heat transfer; Phase composition; phase stability; Phase transitions; Thermal barrier coatings; Thermal conductivity; Thermal expansion; thermal properties; Thermodynamic properties; Thermophysical properties; Yttria-stabilized zirconia
• ISSN: 2331-1940; 2331-1940
• DOI: 10.1080/23311940.2016.1244244

In this work, the Sm 2 AlTaO 7 was synthesized by solid reaction method, and its phase composition, microstructure, and thermophysical properties were investigated. XRD results show that pure Sm 2 AlTaO 7 with single pyrochlore-type structure is prepared successfully. The thermal conductivity of Sm 2 AlTaO 7 at 1,273 K is about 1.13 W m −1  K −1 , which is much lower than that of YSZ. The low thermal conductivity can be attributed to the phonon scattering caused by substituting atoms. Its thermal expansion coefficient is lower than that of Sm 2 Ce 2 O 7 , but close to that of YSZ. There is no phase transformation occurred between 293 and 1,673 K. The excellent thermophysical property means that the Sm 2 AlTaO 7 has potential to be used as candidate ceramic material for thermal barrier coatings.