Title: Low temperature heat capacity of Na4UO5 and Na4NpO5
Authors: SMITH ANNAGRIVEAU Jean-ChristopheCOLINEAU EricRAISON PhilippeWALLEZ GKONINGS Rudy
Citation: JOURNAL OF CHEMICAL THERMODYNAMICS vol. 91 p. 245 - 255
Publisher: ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Publication Year: 2015
JRC N°: JRC95135
ISSN: 0021-9614
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC95135
DOI: 10.1016/j.jct.2015.08.003
Type: Articles in periodicals and books
Abstract: The low temperature heat capacities of Na4UO5 and Na4NpO5 have been measured for the first time in the temperature range 1.9 to 292 K using a PPMS instrument (Physical Properties Measurement System, Quantum Design). The heat capacity and entropy values at 298.15 K have been derived at Cp (Na4UO5,cr, 298:15K) = (219.0±6.6) J.K-1.mol-1, S0(Na4UO5, cr,298:15K) = (247.4±7.4) J.K-1.mol-1, Cp(Na4NpO5,cr,298:15 K) = (220.8±6.6) J.K-1.mol-1, and S0(Na4NpO5,cr,298:15K) = (247.2±7:4) J.K-1.mol-1. When combined with the enthalpies of formations reported in the literature, these data yield standard entropies of formation at ΔS0f (Na4UO5,cr, 298:15K) = -(520.9±7.4) J.K-1.mol-1and ΔS0f (Na4NpO5,cr,298:15K) = -(521.3±7.4) J.K-1.mol-1, and standard Gibbs energies of formation at ΔG0f (Na4UO5, cr,298:15K) = -(2301.7±3.1) kJ.mol-1 and ΔG0f (Na4NpO5,cr,298.15K) = -(2160.0±6:1) kJ.mol-1.
JRC Directorate:Nuclear Safety and Security

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