The high-pressure phase diagram of ammonia dihydrate

Fortes, Andrew D. and Wood, Ian Geoffrey and Alfredsson, Maria and Vocadlo, Lidunka and Knight, Kevin 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. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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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: 28 Jul 2014 08:05
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