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Does metallic ammonium exist?

Stevenson, D. J. (1975) Does metallic ammonium exist? Nature, 258 (5532). pp. 222-223. ISSN 0028-0836. http://resolver.caltech.edu/CaltechAUTHORS:20131029-134126730

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Abstract

The ammonium ion NH_4^+ behaves in many ways like an alkali metal ion. This led Ramsey to propose that monovalent ammonium metal (NH_4^+ ions immersed in an almost uniform, degenerate sea of electrons) is stable at pressures much lower than typical insulator–metal transition pressures of megabars ~10^(11) Pa (10^5 Pa = 1 bar). Subsequently, it was estimated that the transition from a mixture of NH_3 and H_2 molecules to metallic ammonium, occurs at a pressure of less than 2.5×10^(10) Pa. If this estimate were correct, metallic ammonium would be of great interest to experimental high pressure physicists, and to planetary physicists. Indeed, metallic ammonium has been invoked in some but not all models for the interiors of Uranus and Neptune; and its existence could be of importance for calculations of the interior magnetic fields of these planets.


Item Type:Article
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http://dx.doi.org/10.1038/258222a0DOIArticle
http://www.nature.com/nature/journal/v258/n5532/abs/258222a0.htmlPublisherArticle
ORCID:
AuthorORCID
Stevenson, D. J.0000-0001-9432-7159
Additional Information:© 1975 Nature Publishing Group. Received August 4; accepted September 30, 1975. Discussions with N. W. Ashcroft and J. A. Krumhansl are acknowledged, as is the support by grants from the US National Science Foundation and NASA.
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Record Number:CaltechAUTHORS:20131029-134126730
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20131029-134126730
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ID Code:42115
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:01 Nov 2013 21:49
Last Modified:24 Nov 2015 21:15

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