Stability of the crystal structure of L-valine under high pressure
J. Hermínio da Silva
Departamento de Física, Universidade Federal do Ceará, C.P. 6030, CEP 60455-760 Fortaleza, CE, Brazil
Search for more papers by this authorV. Lemos
Departamento de Física, Universidade Federal do Ceará, C.P. 6030, CEP 60455-760 Fortaleza, CE, Brazil
Search for more papers by this authorP. T. C. Freire
Departamento de Física, Universidade Federal do Ceará, C.P. 6030, CEP 60455-760 Fortaleza, CE, Brazil
Search for more papers by this authorF. E. A. Melo
Departamento de Física, Universidade Federal do Ceará, C.P. 6030, CEP 60455-760 Fortaleza, CE, Brazil
Search for more papers by this authorJ. Mendes Filho
Departamento de Física, Universidade Federal do Ceará, C.P. 6030, CEP 60455-760 Fortaleza, CE, Brazil
Search for more papers by this authorJ. A. Lima Jr.
Faculdade de Filosofia Dom Aureliano Matos, Universidade Estadual do Ceará, CEP 62930-000 Limoeiro do Norte, CE, Brazil
Search for more papers by this authorP. S. Pizani
Departamento de Física, Universidade Federal de São Carlos, CEP 13565-905 São Carlos, SP, Brazil
Search for more papers by this authorJ. Hermínio da Silva
Departamento de Física, Universidade Federal do Ceará, C.P. 6030, CEP 60455-760 Fortaleza, CE, Brazil
Search for more papers by this authorV. Lemos
Departamento de Física, Universidade Federal do Ceará, C.P. 6030, CEP 60455-760 Fortaleza, CE, Brazil
Search for more papers by this authorP. T. C. Freire
Departamento de Física, Universidade Federal do Ceará, C.P. 6030, CEP 60455-760 Fortaleza, CE, Brazil
Search for more papers by this authorF. E. A. Melo
Departamento de Física, Universidade Federal do Ceará, C.P. 6030, CEP 60455-760 Fortaleza, CE, Brazil
Search for more papers by this authorJ. Mendes Filho
Departamento de Física, Universidade Federal do Ceará, C.P. 6030, CEP 60455-760 Fortaleza, CE, Brazil
Search for more papers by this authorJ. A. Lima Jr.
Faculdade de Filosofia Dom Aureliano Matos, Universidade Estadual do Ceará, CEP 62930-000 Limoeiro do Norte, CE, Brazil
Search for more papers by this authorP. S. Pizani
Departamento de Física, Universidade Federal de São Carlos, CEP 13565-905 São Carlos, SP, Brazil
Search for more papers by this authorAbstract
Raman scattering measurements were carried out on a single crystal of L-valine with the pressure increasing from the ambient value to 6.9 GPa. Sudden changes in intensity of the bands were observed in the higher energy spectral range at ∼3 GPa and ∼5.3 GPa. Discontinuities observed in the wave number vs. pressure plots occurred in the complete spectrum at those same pressures, suggesting changes in the crystal structure. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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