Ferroelectric properties of pyridinium periodate

Abstract

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Structural phase transitions in pyridinium perrhenate at high pressure

“…Depending on their symmetry and the size of anions, these compounds exhibit a large variety of interesting phenomena: phase transitions, ferroelectricity, dynamic orientational disorder of pyridinium cations, etc., [1][2][3][4]. The ferroelectric state was observed in pyridinium tetrafluoroborate PyHBF 4 (C 5 H 5 NHBF 4 ) [1], pyridinium perchlorate PyHClO 4 [2], pyridinium perrhenate PyHReO 4 [3], and pyridinium periodate PyHIO 4 [4]. Interest in studying the latter two compounds listed above is connected with the fact that their Curie temperatures are close to room temperature.…”

Structural phase transitions and Raman spectra of pyridinium perrhenate at high pressures

“…The existence of ferroelectricity was discovered in pyridinium tetrafluoroborate PyHBF 4 (C 5 H 5 NHBF 4 ) [1], pyridinium perchlorate PyHClO 4 [2], pyridinium perrhenate PyHReO 4 [3] and pyridinium periodide PyHIO 4 [4]. Two latter compounds are of special interest because their Curie temperatures are above room temperature.…”

“…Pyridinium salts exhibit a rich variety of interesting phenomena, such as ferroelectricity, polymorphic phase transformations and orientational dynamical disorder [1][2][3][4]. The existence of ferroelectricity was discovered in pyridinium tetrafluoroborate PyHBF 4 (C 5 H 5 NHBF 4 ) [1], pyridinium perchlorate PyHClO 4 [2], pyridinium perrhenate PyHReO 4 [3] and pyridinium periodide PyHIO 4 [4].…”

Temperature Dependence of Spontaneous Polarization in Order−Disorder Pyridinium Periodate Extracted from 2H NMR Data

“…[13][14][15][16] In PyHBF 4 and PyHClO 4 , in their high-temperature phases (I), the reorientations take place between the equivalent minima of potential energy, while in the intermediate phases (II) and the low-temperature phases (III), the reorientations take place between the minima of different values. The 1 H NMR measurements performed as a function of temperature and pressure for PyHIO 4 have shown that in the ferroelectric phases (the intermediate (II) and low-temperature (III)), the cation reorientations take place between the potential energy minima of different values and have suggested that in the paraelectric phase (the high-temperature phase (I)), the pyridinium cation undergoes reorientations through equivalent potential barriers.…”