Determinations of Ce solid solution mechanism and limit thermal conductivity of YTaO4 ceramics. Issue 1 (January 2023)

• Record Type: Journal Article
• Authors: Su, Tao; Chen, Lin; Qu, Chenkai; Li, Jianyu; Lv, Liang; Wang, Yuncheng; Ji, Xiaolan; Yun, Haitao; Feng, Jing
• Is Part Of: Journal of the European Ceramic Society. Volume 43:Issue 1(2023)
• Page Start: 150
• Page End: 165
• Publication Date: 2023-01
• Subjects: Thermal barrier coating -- Thermal conductivity -- Lattice defects -- Thermal expansion coefficients -- Chemical compatibility; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2022.09.035
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: x mol% CeO2 -YTaO4 (x = 0, 3, 6, 9, 12) ceramics have been synthesized by the spark plasma sintering (SPS) technique. We focus on the changes in lattice distortion, bonding length, thermal conductivity, thermal expansion, and phase stability of the prepared samples. XRD, Raman, and XPS are used to determine the chemical valence and solid solution mechanism of Ce in the lattice of YTaO4, while its effects on thermal/mechanical properties are elucidated from microstructures. Y 3+ is substituted via Ce 3+, and all samples maintain a monoclinic phase. The limit thermal conductivity (1.2 W∙m −1 ∙K −1, 900 °C) is realized in 9 mol% CeO2 -YTaO4, and the thermal expansion coefficients are increased to 10.2 × 10 −6 K −1 at 1200 °C. Furthermore, the exceptional phase stability and mechanical properties of all samples indicate that they can provide good thermal insulation at high temperatures, and have higher working temperatures than the current YSZ thermal barrier coatings.