Calorimetric Study of Nickel Molybdate: Heat Capacity, Enthalpy, and Gibbs Energy of Formation

Masao Morishita, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

The thermodynamic properties of the α and β polymorphs of NiMoO4 were directly investigated by calorimetry. The standard entropies of formation, ΔfT, 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, ΔfT, of α and β were determined by combining Cp,m with the standard enthalpy of formation, Δf298,n at 298 K obtained from drop solution calorimetry in molten sodium molybdate at 973 K. The standard Gibbs energies of formation, ΔfT, of α and β were determined from their ΔfT and Δ fT values. The ΔfT values indicate that the polymorphic transformation from α to β occurs at 1000 K, consistent with the observed phase transformation at 1000 K.

Original languageEnglish (US)
Pages (from-to)1927-1932
Number of pages6
JournalJournal of the American Ceramic Society
Volume86
Issue number11
DOIs
StatePublished - Nov 2003
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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