In:
Acta Crystallographica Section B Structural Science, International Union of Crystallography (IUCr), Vol. 68, No. 2 ( 2012-04-01), p. 128-136
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\bar 3m (I) → R 3 m (II) → Cm (III) → Cc (IV), c ′ = 2 c . 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).
Type of Medium:
Online Resource
ISSN:
0108-7681
DOI:
10.1107/S0108768112005782
DOI:
10.1107/S0108768112005782/eb5013sup1.cif
DOI:
10.1107/S0108768112005782/eb5013r-3msup2.hkl
DOI:
10.1107/S0108768112005782/eb5013r3msup3.hkl
DOI:
10.1107/S0108768112005782/eb5013exp_181sup4.hkl
DOI:
10.1107/S0108768112005782/eb5013120_enansup5.hkl
Language:
Unknown
Publisher:
International Union of Crystallography (IUCr)
Publication Date:
2012
detail.hit.zdb_id:
2020841-8
SSG:
13
Bookmarklink
