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The high-pressure phase diagram of ammonia dihydrate

Fortes, Andrew D., Wood, Ian Geoffrey, Alfredsson, Maria, Vocadlo, Lidunka, Knight, Kevin S., Marshall, W.G., Tucker, M.G., Fernandez-Alonso, F. (2007) The high-pressure phase diagram of ammonia dihydrate. High Pressure Research, 27 (2). pp. 201-212. ISSN 0895-7959. (doi:10.1080/08957950701265029) (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)

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. (Contact us about this Publication)
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
DOI/Identification number: 10.1080/08957950701265029
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 > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Maria Alfredsson
Date Deposited: 03 Jul 2008 13:23 UTC
Last Modified: 28 May 2019 13:40 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/4778 (The current URI for this page, for reference purposes)
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