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Raman phonon spectroscopic study of phase transition in o ‐aminobenzoic acid crystal (II)
Author(s) -
Chakrabarti Subhasis,
Sarkar Uttam K.,
Misra T. N.
Publication year - 1991
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250220710
Subject(s) - phonon , raman spectroscopy , phase transition , crystal (programming language) , chemistry , atmospheric temperature range , phase (matter) , crystallography , crystal structure , condensed matter physics , materials science , optics , physics , thermodynamics , organic chemistry , computer science , programming language
Raman phonon spectroscopy in the 10–150 cm −1 shift range was used to study the phase transition in an o ‐aminobenzoic acid crystal (II). At 77 K, twelve distinct phonon modes are observed whereas at 300 K the spectrum shows ten phonon bands. The temperature dependence of the phonon frequencies and band widths suggests that the crystal goes through a phase transition at ca. 200 K. The temperature dependence of the internal modes predicts that the phase transition is associated with some structural change in the phenyl ring.