Author： Czarnecki P.
Publisher： Taylor & Francis Ltd
ISSN： 0141-1594
Source： Phase Transitions: A Multinational Journal, Vol.76, Iss.9-10, 2003-01, pp. : 801-805
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Abstract
The phase transitions in ferroelectric pyridinium tetrafluoroborate (PyBF4) and pyridinium perchlorate (PyClO4) have been characterized by structural studies. The continuous ferroelectric phase transition at 238.7 K in PyBF4 appears to be a unique case for multiaxial ferroelectrics, while the first order phase transition in PyClO4 at 248 K is consistent with the Landau theorem for deducing the character of phase transitions from symmetry considerations. The phase transition in both materials is caused by ordering of the pyridinium cation as well as tetrahedral anions.
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