Crystal structure and phase transition of the quinolinium tetrabromothallate(III)

The salt quinolinium tetrabromothallate(III) is orthorhombic Pna2 1 with the following unit cell dimensions: a = 9.582(2), b = 10.0210(19), c = 14.916(2) Å, Z = 4. The structure was solved by Patterson methods and refined to a final R-value of 0.0452 for 2043 observed reflections. The examination of...

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Bibliographic Details
Published in:Phase transitions 2008-01, Vol.81 (1), p.101-111
Main Authors: Chaari, N., Abdelkefi, Z., Chaabouni, S., Chniba-Boudjada, N., Bordet, P.
Format: Article
Language:English
Subjects:
Chemical Sciences
Cristallography
Dielectric, Bromothallate(III)
DSC
Structure
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Summary:The salt quinolinium tetrabromothallate(III) is orthorhombic Pna2 1 with the following unit cell dimensions: a = 9.582(2), b = 10.0210(19), c = 14.916(2) Å, Z = 4. The structure was solved by Patterson methods and refined to a final R-value of 0.0452 for 2043 observed reflections. The examination of the structure shows quinolinium cations separating chains of tetrahedral , these chains are perpendicular to the c axis. Infrared spectra confirms the presence of the organic cations, differential scanning calorimetry reveals a transition at T = 406 K. Electrical measurements and X-ray powder diffraction were performed to discuss the mechanism of the phase transition.
ISSN:0141-1594
1029-0338
DOI:10.1080/01411590701517170