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The phase diagram o...
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Andersson, PerUmeå universitet,Institutionen för fysik
(författare)
The phase diagram of ammonium iodide (NH4I) under pressure, and a comparison with NH4Cl and NH4Br
- Artikel/kapitelEngelska1987
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2000-11-22
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Institute of Physics (IOP),1987
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LIBRIS-ID:oai:DiVA.org:umu-222909
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-222909URI
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https://doi.org/10.1088/0022-3719/20/29/011DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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During recent measurements of thermal conductivity using the transient hot-wire method, data were obtained for pressure-temperature coordinates corresponding to transitions amongst phases I, II, III and IV of NH4I which extended reliable knowledge of the phase diagram to pressures of 2 GPa. Comparison of the phase diagrams of NH4Cl, NH4Br and NH4I showed that a generalised phase diagram covering these substances was a poor approximation if the higher-order critical points or triple points (as appropriate) were made coincident. However, the ferro-ordered-to-disordered phase transition boundaries of these substances could be made to follow a common curve with an alternative empirical adjustment of pressure and temperature. When this was done, the adjustments of temperature required were correlated with differences in barrier height opposing re-orientational motion of the ammonium species.
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Ross, Russell G.Umeå universitet,Institutionen för fysik
(författare)
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Umeå universitetInstitutionen för fysik
(creator_code:org_t)
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Ingår i:Journal of Physics C: Solid State Physics: Institute of Physics (IOP)20:29, s. 4737-47430022-3719
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