Fortes, A.D. and Wood, I.G. and Alfredsson, M. and Vocaldo, L. and Knight, K.S. and Marshall, W.G. and Tucker, M.G. and Fernandez-Alonso, F. (2007) The high-pressure phase diagram of ammonia dihydrate. High Pressure Research, 27 (2). pp. 201-212. ISSN 0895-7959.
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| Official URL http://dx.doi.org/10.1080/08957950701265029 |
Abstract
We have investigated the P-T phase diagram of ammonia dihydrate (ADH), ND3 center dot 2D(2)O, using powder neutron diffraction methods over the range 0-9 GPa, 170-300 K. In addition to the ambient pressure phase, ADH I, we have identified three high-pressure phases, ADH II, III, and IV, each of which has been reproduced in at least three separate experiments. Another, apparently body-centred-cubic, phase of ADH has been observed on a single occasion above 6 GPa at 170 K. The existence of a dehydration boundary has been confirmed where, upon compression or warming, ADH IV decomposes to a high-pressure ice phase (ice VII or VIII) and a high-pressure phase of ammonia monohydrate (AMH V or VI).
| Item Type: | Article |
|---|---|
| Additional information: | ISI Document Delivery No.: 200GG Times Cited: 0 Cited Reference Count: 38 Fortes, A. D. Wood, I. G. Alfredsson, M. Vocaldo, L. Knight, K. S. Marshall, W. G. Tucker, M. G. Fernandez-Alonso, F. |
| Uncontrolled keywords: | ammonia dihydrate neutron diffraction polymorphism |
| Subjects: | Q Science |
| Divisions: | Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group |
| Depositing User: | Maria Alfredsson |
| Date Deposited: | 03 Jul 2008 13:23 |
| Last Modified: | 14 Jan 2010 14:17 |
| Resource URI: | http://kar.kent.ac.uk/id/eprint/4778 (The current URI for this page, for reference purposes) |
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