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Pressure-induced phase transformations in l-alanine crystals |
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| Authors: | J. Staun Olsen P.T.C. Freire F.E.A. Melo |
| Affiliation: | a Oersted Laboratory, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark b Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark c Departamento de Fisica, Universidade Federal do Ceará, Caixa Postal 6030, CEP 60455-900 Fortaleza-CE, Brazil |
| Abstract: | 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. |
| Keywords: | A. Organic compounds C. High pressure C. Raman spectroscopy C. X-ray diffraction D. Phase transitions |
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