TY - JOUR
T1 - Calorimetric Study of Nickel Molybdate
T2 - Heat Capacity, Enthalpy, and Gibbs Energy of Formation
AU - Morishita, Masao
AU - Navrotsky, Alexandra
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2003/11
Y1 - 2003/11
N2 - The thermodynamic properties of the α and β polymorphs of NiMoO4 were directly investigated by calorimetry. The standard entropies of formation, ΔfS°T, of α and β were determined from measuring the molar heat capacity, Cp,m, from near absolute zero (2 K) to high temperature (1380 K) by a relaxation method and differential scanning calorimetry. The standard enthalpies of formation, ΔfH°T, of α and β were determined by combining Cp,m with the standard enthalpy of formation, ΔfH°298,n at 298 K obtained from drop solution calorimetry in molten sodium molybdate at 973 K. The standard Gibbs energies of formation, ΔfG°T, of α and β were determined from their ΔfS°T and Δ fH°T values. The ΔfG° T values indicate that the polymorphic transformation from α to β occurs at 1000 K, consistent with the observed phase transformation at 1000 K.
AB - The thermodynamic properties of the α and β polymorphs of NiMoO4 were directly investigated by calorimetry. The standard entropies of formation, ΔfS°T, of α and β were determined from measuring the molar heat capacity, Cp,m, from near absolute zero (2 K) to high temperature (1380 K) by a relaxation method and differential scanning calorimetry. The standard enthalpies of formation, ΔfH°T, of α and β were determined by combining Cp,m with the standard enthalpy of formation, ΔfH°298,n at 298 K obtained from drop solution calorimetry in molten sodium molybdate at 973 K. The standard Gibbs energies of formation, ΔfG°T, of α and β were determined from their ΔfS°T and Δ fH°T values. The ΔfG° T values indicate that the polymorphic transformation from α to β occurs at 1000 K, consistent with the observed phase transformation at 1000 K.
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U2 - 10.1111/j.1151-2916.2003.tb03583.x
DO - 10.1111/j.1151-2916.2003.tb03583.x
M3 - Article
AN - SCOPUS:0344443405
SN - 0002-7820
VL - 86
SP - 1927
EP - 1932
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 11
ER -