Sooryanarayana, K. ; Guru Row, T. N. (1996) Phase transitions in triammonium hydrogen disulphate. Crystal structures at -110° c and 140° c Phase Transitions, 58 (4). pp. 263-271. ISSN 0141-1594
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Related URL: http://dx.doi.org/10.1080/01411599608241823
Abstract
Structural phase transitions in triammonium hydrogen disulphate have been characterised by determining the crystaI structures at -110°C by single crystal X-ray diffraction studies and at +140°C by X-ray powder diffraction studies. The structure at -110°C is monoclinic C2/c (a=15.578(4), b=5.816(1), c=10.050(4) Å, β= 101.58(3)° and volume= 892.0(4) Å3), whereas the structure at the higher temperature (+140°C) is rhombohedral R3m (a=5.906(1), c=22.602(1) Å, volume = 682.75 Å3 and Z=3). The starting model for Rietveld refinement was derived from that of the corresponding selenium analogue. The effect of reorientation of SO4 groups in terms of intra and intermolecular interactions is analysed.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Taylor and Francis Ltd. |
| Keywords: | Structural Phase Transition; (NH4)3H(SO4)2; Low Temperature X-Ray Crystallography; High Temperature Powder Diffraction; Rietveld Refinement |
| ID Code: | 11766 |
| Deposited On: | 13 Nov 2010 13:55 |
| Last Modified: | 03 Jun 2011 04:33 |
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