A calorimetric and thermodynamic investigation of uranyl molybdate UO(2)MoO(4)

Suleimanov, E. V., Golubev, A. V., Alekseev, E. V., Geiger, C. A., Depmeier, W. and Krivovichev, V. G. (2010) A calorimetric and thermodynamic investigation of uranyl molybdate UO(2)MoO(4) Journal of Chemical Thermodynamics, 42 (7). pp. 873-878. DOI 10.1016/j.jct.2010.02.011.

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Abstract

A thermophysical and thermochemical calorimetric investigation of UO(2)MoO(4) was undertaken. The UO(2)MoO(4) was synthesized by solid-state reaction of MoO(3) and UO(3) and characterized by X-ray powder diffraction and X-ray fluorescence methods. The temperature of fusion, T(fus) = (1212 +/- 2) K, and the enthalpy of fusion, Delta(fus)H degrees (1212 K, UO(2)MoO(4), Cr.) = (16 +/- 1) kJ . mol(-1), were determined using DTA methods. The low-temperature heat capacity, C(p)degrees(T), behaviour of UO(2)MoO(4) was measured using adiabatic calorimetry from T = (6 to 301) K and the third-law entropy determined. S degrees = (192.8 +/- 0.8) J . mol(-1) . K(-1) at T = 298.15 K is obtained. The enthalpy of formation of UO(2)MoO(4) was determined using HE-solution calorimetry giving Delta(f)H degrees(298 K, UO(2)MoO(4), Cr.) = -(1985 +/- 8) kJ . mol(-1). From these data, the Gibbs energy of formation Delta(f)G degrees(298 K, UO(2)MoO(4), cr.) = -(1836 +/- 8) kJ . mol(-1) is calculated. Smoothed C(p)degrees(T) values between T = (0 and 300) K are presented along with values for S degrees and the functions [H degrees(T) - H degrees(0)] and [G degrees(T) - H degrees(0)]. (c) 2010 Elsevier Ltd. All rights reserved.

Document Type: Article
Keywords: Calorimetry Uranyl molybdate Heat capacity Entropy Enthalpy of formation DTA crystal-chemistry umoo6
Research affiliation: Kiel University
DOI etc.: 10.1016/j.jct.2010.02.011
ISSN: 0021-9614
Date Deposited: 22 Dec 2011 05:17
Last Modified: 08 Oct 2012 10:00
URI: http://eprints.uni-kiel.de/id/eprint/15717

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