Spinodal equation of state for rutile TiO2

E. Francisco, M. Bermejo, V. Garcia Baonza, Leif Gerward, J. M. Recio

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Abstract

We present a general computational scheme to extend the spinodal equation of state [Garcia Baonza , Phys. Rev. B 51, 28 (1995)] to the interpretation of the cell parameters response to hydrostatic pressure in orthogonal lattices. As an important example, we analyze the pressure (p)-volume (V)-temperature (T) data of the rutile phase of TiO2. We show that results of ab initio perturbed ion calculations and very recent x-ray-diffraction experiments of isothermal compression on this system closely follow the spinodal conduct. The computational scheme permits the incorporation of temperature effects in the static calculation as well as in the room-temperature experimental data. Overall, we find highly consistent results and good theory-experiment agreement for a significant series of observables, including structural parameters, p-V diagram, bulk modulus, linear compressibilities, and thermal-expansion coefficient. The observed discrepancies in the pressure first derivative of the bulk modulus can be traced back to the difference between the theoretical and the experimental spinodal pressure.
Original languageEnglish
JournalPhysical Review B Condensed Matter
Volume67
Issue number6
Pages (from-to)064110
ISSN0163-1829
DOIs
Publication statusPublished - 2003

Bibliographical note

Copyright (2003) American Physical Society

Keywords

  • INITIO PERTURBED ION
  • HIGH-PRESSURE
  • MECHANICAL CLUSTER CALCULATIONS
  • PROGRAM
  • SOLIDS
  • PHASES
  • POLYMORPHS
  • SIMULATION
  • TITANIUM-DIOXIDE
  • ANATASE

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