Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1252174 | Vibrational Spectroscopy | 2007 | 10 Pages |
Abstract
Infrared spectra of powdered 4-aminopyridinium tetrachloroantimonate(III) [4-NH2C5H4NH][SbCl4] (abbreviation: 4-APCA) in the region of the internal vibrations of the 4-aminopyridinium cation (3600 and 400Â cmâ1) and in the temperature interval 10-300Â K covering three structural phase transitions are presented and discussed. The results confirm the order-disorder mechanism of the phase transition at 245Â K. The paraelectric-ferroelectric phase transition at 271Â K is hardly visible in the infrared spectra, which is in agreement with its “displacive” nature of the transition suggested by the single crystal X-ray and ac calorimetric studies.
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Authors
G. Bator, R. Jakubas, J. Baran,