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Solid‐phase transitions in TlHSO 4 crystal
Author(s) -
Le Calve N.,
Pasquier B.,
Romain F.,
Taffin A.
Publication year - 1994
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.1250250603
Subject(s) - raman spectroscopy , metastability , crystallite , phase (matter) , plastic crystal , crystallography , infrared spectroscopy , hydrogen bond , phase transition , ion , chemistry , crystal (programming language) , crystal structure , spectroscopy , materials science , analytical chemistry (journal) , molecule , thermodynamics , physics , organic chemistry , optics , programming language , computer science , quantum mechanics
Abstract Polycrystalline TlHSO 4 was investigated by calorimetry (253–423 K) and by infrared (10–300 K) and Raman (10–420 K) spectroscopy. Two phase transitions are detected at 320 and 388 K. A complete assignment of the spectra of the room‐temperature phase (III) is given and the spectroscopic results are consistent with infinite chains of hydrogen bonds. This structure appears disordered above 320 K (phase II). The high‐temperature phase (I) presents the characteristic features of a plastic phase according to the spectroscopic manifestations of an increasing orientational disorder of sulphate ions. Above 360 K, a metastable phase (I′) showing a complex hydrogen‐bonded framework is identified.