Molar heat capacity and thermodynamic functions for CaTiO3

Brian F. Woodfield, Jennifer L. Shapiro, Rebecca Stevens, Juliana Boerio-Goates, Robert L. Putnam, Katheryn B. Helean, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

Calcium titanate, CaTiO3, has appeared as a significant impurity in the synthesis of several ceramic host materials for the disposal of excess weapons grade plutonium and uranium. Previously reported heat capacities on CaTiO3 extend only to T = 50 K. Also, the agreement of the low-temperature heat capacity results with those used to calculate the currently accepted values of the thermodynamic functions at elevated temperatures is poor near their intersection. To resolve these problems, the heat capacity of CaTiO3 was measured from T ≈ 14 K to T ≈ 400 K using an adiabatic calorimeter. A nine-term fitting equation was found to represent adequately the low-temperature experimental heat capacities from this study and high-temperature results from the literature. It is used to extrapolate the thermodynamic data for CaTiO3 to T = 1900 K. New values for ΔfGom and ΔfHom as a function of temperature are also tabulated.

Original languageEnglish (US)
Pages (from-to)1573-1583
Number of pages11
JournalJournal of Chemical Thermodynamics
Volume31
Issue number12
DOIs
StatePublished - Dec 1999
Externally publishedYes

Keywords

  • CaTiO
  • Enthalpy of formation
  • Entropy
  • Heat capacity
  • Thermodynamics

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Physical and Theoretical Chemistry

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