Ferroelectric properties of pyridinium perchlorate

Czarnecki, P.; Nawrocik, W.; Paja̢k, Z.; Wąsicki, J.

doi:10.1088/0953-8984/6/26/017

Cited by 93 publications

(78 citation statements)

References 9 publications

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“…Recently discovered ferroelectric properties of pyridinium tetrafluoroborate C 5 H 6 N BF À 4 abbreviated as PyBF 4 [1] were also detected in other pyridinium salts [2,3]. A characteristic feature of this new ferroelectric family is the occurrence of a sequence of two-phase transitions; in PyBF 4 there are the ferroelectric phase transition at T 1 238X7 K and another transition at T 2 204 K. Earlier NMR studies of pyridinium salts [4 to 7] proved the occurrence of reorientation of both pyridinium cation and BF 4 anion in the symmetric high-temperature phases.…”

Section: Introductionmentioning

confidence: 93%

Critical Slowing Down in Ferroelectric Pyridinium Tetrafluoroborate

Czarnecki

Szafraniak

1998

phys. stat. sol. (b)

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Complex permittivity of a ferroelectric single crystal of PyBF 4 was measured in the frequency range from 1 kHz to 13 MHz. In the vicinity of ferroelectric phase transition, the phenomenon of critical slowing down was detected. The dielectric relaxation in that crystal can be described by the Debye relaxation equation with a single relaxation time. The results suggest the order±disorder nature of the continuous ferroelectric phase transition.

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Section: Introductionmentioning

confidence: 93%

Critical Slowing Down in Ferroelectric Pyridinium Tetrafluoroborate

Czarnecki

Szafraniak

1998

phys. stat. sol. (b)

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“…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.…”

Section: Introductionmentioning

confidence: 99%

Structural phase transitions in pyridinium perrhenate at high pressure

Кичанов¹,

Козленко²,

Wąsicki³

et al. 2008

Journal of Molecular Structure

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-The structure of deuterated pyridinium perrhenate (d 5 PyH)ReO 4 ( C 5 D 5 NHReO 4 ) is studied by X-ray diffraction at room temperature and pressures up to 3.5 GPa and by neutron diffraction in the temperature range 10-293 K and at pressures up to 2.0 GPa. Under normal conditions, this compound belongs to the orthorhombic space group Cmc 2 1 (ferroelectric phase II). At room temperature and pressures above P > 0.7 GPa, a transition to an orthorhombic phase (paraelectric phase II) is observed. This paraelectric phase is described by the space group Cmcm . At a pressure as high as P = 2.0 GPa, phase I remains stable at temperatures down to 10 K. This fact indicates that the high pressure suppresses the ferroelectric state in deuterated pyridinium perrhenate (d 5 PyH)ReO 4 .

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“…Pyridinium perchlorate (PClO) and pyridinium fluoroborate (PFB) are particularly interesting as they exhibit successive structural phase transitions. Single crystals studies revealed two successive phase transitions at 248 K, 232 K for PClO [6] and 240 K, 205 K for PFB [7], respectively. On descending temperature the successive phases can be numbered as I, II, and III.…”

Section: Introductionmentioning

confidence: 99%

Domain Structure and Birefringence in Pyridinium Perchlorate and Pyridinium Fluoroborate Single Crystal

Kosturek

Czapla

2004

Acta Phys. Pol. A

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Pyridinium perchlorate and pyridinium fluoroborate were grown and their successive phase transitions were studied by means of polarized microscopic observations and measurements of linear birefringence temperature changes. The microscopic observations revealed domain structure appearance at 245 K and 238.7 K for pyridinium perchlorate and pyridinium fluoroborate, respectively. This domain structure exists also in lower phases. Birefringence measurements confirmed two first-order phase transitions at 245.3 K and 231.5 K for pyridinium perchlorate and two continuous phase transitions at 238.7 K and 205.4 K for pyridinium fluoroborate.

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Ferroelectric properties of pyridinium perchlorate

Cited by 93 publications

References 9 publications

Critical Slowing Down in Ferroelectric Pyridinium Tetrafluoroborate

Critical Slowing Down in Ferroelectric Pyridinium Tetrafluoroborate

Structural phase transitions in pyridinium perrhenate at high pressure

Domain Structure and Birefringence in Pyridinium Perchlorate and Pyridinium Fluoroborate Single Crystal

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