Measurement of the Gibbs energy of formation of URh3 using an oxide solid electrolyte

Jacob, Thomas K and Chandrasekharaiah, Mallasetty S (1990) Measurement of the Gibbs energy of formation of URh3 using an oxide solid electrolyte. In: Zeitschrift für Metallkunde, 81 (7). pp. 509-512.

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Abstract

The Gibbs' energy offormation of the intermetallic compound URh3has been measured in the temperature range 980 to 1320 K using an oxide solid state cell incorporating yttria-doped thoria as the solid electrolyte and a mixture of manganese and manganese oxide as the reference electrode. The cell can be represented as Pt, Mn + MnO I (Y203)Th02 I Rh + URh3 + U02 + x' Rh, Pt The reversible emf of the cell was a linear function of temperature E = 15.60 +0.0237 T (±0.8) mY. Using auxiliary thermodynamic data for MnO and U02+ x the Gibbs' energy of formation of URh3 from component metals has been computed. The results can be expressed by the equation L'.G?< URh3 > = -316240 + 13.22 T (± 3000) J mol-1. The "third-law" enthalpy of formation of URh3at 298 K is -293.2 (± 4) kJ mol-1, significantly more negative than the value of -181.5 kJ mol-1 calculated using Miedema's model.

Item Type:	Journal Article
Publication:	Zeitschrift für Metallkunde
Publisher:	Carl Hanser Verlag
Additional Information:	Copyright of this article belongs to Carl Hanser Verlag.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	09 Dec 2011 10:22
Last Modified:	09 Dec 2011 10:22
URI:	http://eprints.iisc.ac.in/id/eprint/42666

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