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Małuszyńska H, Czarnecki P, Czarnecka A, et al. Structures and phase transitions in a new ferroelectric -- pyridinium chlorochromate -- studied by X-ray diffraction, DSC and dielectric methods. Acta Crystallogr B. 2012;68:128-36doi: 10.1107/S0108768112005782.
Małuszyńska, H., Czarnecki, P., Czarnecka, A., & Pająk, Z. (2012). Structures and phase transitions in a new ferroelectric -- pyridinium chlorochromate -- studied by X-ray diffraction, DSC and dielectric methods. Acta crystallographica. Section B, Structural science, 68128-36. https://doi.org/10.1107/S0108768112005782
Małuszyńska, Hanna, et al. "Structures and phase transitions in a new ferroelectric -- pyridinium chlorochromate -- studied by X-ray diffraction, DSC and dielectric methods." Acta crystallographica. Section B, Structural science vol. 68 (2012): 128-36. doi: https://doi.org/10.1107/S0108768112005782
Małuszyńska H, Czarnecki P, Czarnecka A, Pająk Z. Structures and phase transitions in a new ferroelectric -- pyridinium chlorochromate -- studied by X-ray diffraction, DSC and dielectric methods. Acta Crystallogr B. 2012 Apr;68:128-36. doi: 10.1107/S0108768112005782. Epub 2012 Mar 20. PMID: 22436911.
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Acta Crystallogr B. 2012 Apr;68:128-36. doi: 10.1107/S0108768112005782. Epub 2012 Mar 20.

Structures and phase transitions in a new ferroelectric -- pyridinium chlorochromate -- studied by X-ray diffraction, DSC and dielectric methods.

Acta crystallographica. Section B, Structural science

Hanna Małuszyńska, Piotr Czarnecki, Anna Czarnecka, Zdzisław Pająk

Affiliations

  1. Physics Department, A. Mickiewicz University, Umultowska 85, 61-614 Pozna?, Poland. [email protected]

PMID: 22436911 DOI: 10.1107/S0108768112005782

Abstract

Pyridinium chlorochromate, [C(5)H(5)NH](+)[ClCrO(3)](-) (hereafter referred to as PyClCrO(3)), was studied by X-ray diffraction, differential scanning calorimetry (DSC) and dielectric methods. Studies reveal three reversible phase transitions at 346, 316 and 170 K with the following phase sequence: R ̅3m (I) → R3m (II) → Cm (III) → Cc (IV), c' = 2c. PyClCrO(3) is the first pyridinium salt in which all four phases have been successfully characterized by a single-crystal X-ray diffraction method. Structural results together with dielectric and calorimetric studies allow the classification of the two intermediate phases (II) and (III) as ferroelectric with the Curie point at 346 K, and the lowest phase (IV) as most probably ferroelectric. The ferroelectric hysteresis loop was observed only in phase (III). The high ionic conductivity hindered its observation in phase (II).

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