Unusual structural phase transition in [N(C2H5)4][N(CH3)4][ZnBr4]. (3rd April 2018)

• Record Type: Journal Article
• Authors: Krawczyk, Monika K.; Ingram, Adam; Cach, Ryszard; Czapla, Zbigniew; Czupiński, Olaf; Dacko, Sławomir; Staniorowski, Piotr
• Is Part Of: Phase transitions. Volume 91:Number 4(2018)
• Page Start: 356
• Page End: 369
• Publication Date: 2018-04-03
• Subjects: Phase transition -- crystal structure -- electric permittivity -- ferroelastic domain structure -- halogenozincates(II); Phase transformations (Statistical physics) -- Periodicals; 530.47405
• DOI: 10.1080/01411594.2017.1402179
• Languages: English
• ISSNs: 0141-1594

Abstract

ABSTRACT: The new hybrid organic–inorganic crystal [N(C2 H5 )4 ][N(CH3 )4 ][ZnBr4 ] was grown and its physical properties and structural phase transition are presented. On the basis of thermal analysis (DSC (differential scanning calorimetry), DTA (differential thermal analysis), DTG), X-ray structural, dilatometric and dielectric studies as well as optical observation, the reversible first-order phase transition at 490/488 K on heating and cooling run, respectively, has been found. An appearance of domain structure of ferroelastic type gives evidence for an untypical lowering of crystal symmetry during the phase transition. At room temperature, the satisfying crystal structure solution was found in the tetragonal system, in the P 4 ¯ 21 m space group.