Application of calorimetry on a chip to high-pressure materials

Alexandra Navrotsky, Maria Dorogova, Frances Hellman, David W. Cooke, Barry L. Zink, Charles E. Lesher, Juliana Boerio-Goates, Brian F. Woodfield, Brian Lang

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Silicon micromachined calorimeters ("calorimeter on a chip") are used to measure heat capacities and phase transition enthalpies for thin film, single crystal, and powder samples (5-500 μg). The technology is thus compatible with the small samples produced in multianvil and large diamond anvil cells. Techniques for handling small samples and attaching them to the calorimetric devices have been developed. Initial data illustrate application to CoO and to Fe2SiO4 olivine and spinel, a quenched high pressure phase metastable at ambient conditions. The calorimetric entropy of the olivine - spinel transition in Fe2SiO4 (-16 ± 5 J/mol·K) is in good agreement with that calculated from phase equilibrium data (-14 ± 3 J/mol·K). A magnetic transition in iron silicate spinel, detected previously by Mossbauer spectroscopy, is seen in the calorimetric signal.

Original languageEnglish (US)
Pages (from-to)9187-9191
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume104
Issue number22
DOIs
StatePublished - May 29 2007
Externally publishedYes

Keywords

  • Fayalite
  • FeSiO spinel

ASJC Scopus subject areas

  • General

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