Thermodynamic properties of YRhO3 and phase relations of the system Y-Rh-O

Jacob, K T and Kothawade, Prajakta (2019) Thermodynamic properties of YRhO3 and phase relations of the system Y-Rh-O. In: MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS, 245 . pp. 47-54.

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Abstract

As part of a larger program of research on physico-chemical aspects of processing Rh catalysts, thermodynamic properties of the ternary oxide YRhO3 are determined in the temperature range from 900 to 1300 K using a solid-state electrochemical cell incorporating yttria-stabilized zirconia as the electrolyte. The standard Gibbs energy of formation of orthorhombically-distorted perovskite YRhO3 from its component binary oxides Y2O3 and Rh2O3 is calculated. Assuming Neumann-Kopp rule, the standard entropy of YRhO3 at 298.15 K is evaluated as 83.51(+/- 1.5) J K-1 mol(-1). The standard enthalpy of formation of the compound from elements at 298.15 K is obtained as -1219.2(+/- 2.8) kJ mol(-1). Using isothermal equilibration technique, YRhO3 is identified as the only inter-oxide compound in the system Y2O3-Rh2O3. Existence of a three-phase field involving Rh + Y2O3 + YRhO3 is confirmed. Based on thermodynamic data phase relations in the system Y-Rh-O are computed at 1200 K. Various phase diagrams at 1200 K are presented.

Item Type:	Journal Article
Publication:	MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	Copyright to this article belongs to ELSEVIER SCIENCE BV
Keywords:	Gibbs energy of formation; Enthalpy; Entropy; Decomposition temperature; Chemical potential diagram; Phase diagram Y-Rh-O
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	05 Nov 2019 06:09
Last Modified:	05 Nov 2019 06:09
URI:	http://eprints.iisc.ac.in/id/eprint/63239

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