Structure and mechanism of ferroelectric phase transition in tris (dimethylammonium)-nonachlorodiantimonate (III)
- 1 January 1988
- journal article
- research article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 77 (1), 31-37
- https://doi.org/10.1080/00150198808223224
Abstract
The X-ray diffraction studies were carried out for the crystals of [NH2(CH3)2]3Sb2Cl9 at 293 K in paraelectric phase. The crystals are monoclinic, space group P21/a, with the unit cell parameters: a = 14.045(4), b = 9.018(3), c = 9.670(2) Å, β = 95.47(2)° and Z = 2. The SbCl6 distorted octahedra form infinite polyanion layers via chlorine bridges. The cavities in a twelve-membered (‒Sb‒Cl‒)6 rings are occupied by disordered dimethylammonium cations. The IR spectra and dielectric relaxation studies confirm the mechanism of para-ferroelectric phase transition in which the main role play the reorientations of dimethylammonium cations around 180° and their freezing below Tc = 242 K.Keywords
This publication has 4 references indexed in Scilit:
- Ferroelectric phase transition in tris (dimethylammonium) nonachlorodiantimonate (III), [NH2(CH3)2]3Sb2Cl9Solid State Communications, 1986
- Ferroelectric phase transition in [(CH3)3NH]3Sb2Cl9(TMACA)Ferroelectrics Letters Section, 1986
- Tri‐ und TetraMethylammonium‐chloroantimonate(III)Zeitschrift für anorganische und allgemeine Chemie, 1979
- A method for location of the peaks in step-scan measured Bragg reflexionsActa Crystallographica Section A, 1974