Low temperature heat capacity study of Ba2TiSi2O 8 and Sr2TiSi2O8

Quan Shi, Tae Jin Park, Jacob Schliesser, Alexandra Navrotsky, Brian F. Woodfield

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

The heat capacities of powdered Ba2TiSi2O8 and Sr2TiSi2O8 have been measured over the temperature range from (2 to 300) K using a Quantum Design Physical Property Measurement System (PPMS). These two compounds have similar heat capacity values over the experimental temperature range because of their analogous structures. However, the heat capacities do display a crossover at T = 112.6 K, below which the heat capacity of Ba2TiSi2O8 becomes larger than that of Sr2TiSi2O8. The experimental data have been fitted to a series of theoretical functions from which the thermodynamic functions have been calculated. The standard molar entropies at T = 298.15 K have been determined to be (254.67 ± 2.55) and (252.61 ± 2.78) J·K-1·mol-1 for Ba 2TiSi2O8 and Sr2TiSi 2O8, respectively.

Original languageEnglish (US)
Pages (from-to)77-84
Number of pages8
JournalJournal of Chemical Thermodynamics
Volume72
DOIs
StatePublished - May 2014
Externally publishedYes

Keywords

  • BaTiSiO
  • Ferroelectric
  • Fresnoite
  • Heat capacity
  • PPMS
  • SrTiSi O

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Low temperature heat capacity study of Ba<sub>2</sub>TiSi<sub>2</sub>O <sub>8</sub> and Sr<sub>2</sub>TiSi<sub>2</sub>O<sub>8</sub>'. Together they form a unique fingerprint.

Cite this