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Phase diagram of the system Ce-Rh-O

Jacob, KT and Muraleedharan, S (2019) Phase diagram of the system Ce-Rh-O. In: Calphad: Computer Coupling of Phase Diagrams and Thermochemistry, 65 . pp. 171-176.

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Abstract

Although important for catalytic applications, a phase diagram for the ternary system Ce-Rh-O is not found in the literature. Phase diagrams of most Ln-Rh-O systems show LnRhO 3 with orthorhombic perovskite structure as the lone stable ternary oxide. Based on systematic trends in experimentally determined thermodynamic properties of eleven LnRhO 3 compounds, the Gibbs energy of formation of CeRhO 3 is evaluated as a function of temperature. For the reaction, 1/2 Ce 2 O 3 (A-rare earth) + 1/2 Rh 2 O 3 (ortho) � CeRhO 3 , �G°/J mol �1 = �69,336 + 5.26(T / K). The estimated data for CeRhO 3 along with evaluated data for the binary Ce-Rh and data for binary oxides from the literature are used to compute the phase diagram for the system Ce-Rh-O at high temperature. Because of the significantly higher stability of CeO 2-x compared to Ce 2 O 3 , the compound CeRhO 3 is found to be unstable. A section of the phase diagram and an oxygen potential � composition diagram for the system Ce-Rh-O at 1200 K are computed from thermodynamic data. © 2019 Elsevier Ltd

Item Type: Journal Article
Additional Information: cited By 0
Keywords: Binary alloys; Cerium oxide; Gibbs free energy; Perovskite; Rare earths, Catalytic applications; Composition diagrams; Gibbs energy of formation; High temperature; LnRhO3; Orthorhombic perovskite; Oxygen potential; Thermodynamic data, Phase diagrams
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 26 Mar 2019 07:52
Last Modified: 26 Mar 2019 07:52
URI: http://eprints.iisc.ac.in/id/eprint/61986

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