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.
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