Pressure-induced phase transformations in L-alanine crystals

J. Staun Olsen, Leif Gerward, P.T.C. Freire, J. Filho Mendes, F.E.A. Melo, A.G. Souza Filho

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Raman scattering and synchrotron X-ray diffraction have been used to investigate the high-pressure behavior of L-alanine. This study has confirmed a structural phase transition observed by Raman scattering at 2.3 GPa and identified it as a change from orthorhombic to tetragonal structure. Another phase transformation from tetragonal to monoclinic structure has been observed at about 9 GPa. From the equation of state, the zero-pressure bulk modulus and its pressure derivative have been determined as (31.5 +/- 1.4) GPa and 4.4 +/- 0.4, respectively.
Original languageEnglish
JournalJournal of Physics and Chemistry of Solids
Issue number7
Pages (from-to)1641-1645
Publication statusPublished - 2008


  • Raman spectroscopy
  • organic compounds
  • phase transitions
  • X-ray diffraction
  • high pressure


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