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Phase transitions of K2TaF7 within 680-800 degrees C
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2008 (English)In: Central European Journal of Chemistry, ISSN 1895-1066, Vol. 6, no 1, 27-32 p.Article in journal (Refereed) Published
Abstract [en]

Three thermal effects on heating/cooling of K2TaF7 in the temperature interval of 680-800 degrees C were investigated by the DSC method. The values determined for the enthalpy change of the individual processes are: Delta H-transII(m)(K2TaF7; 703 degrees C) = 1.7(2) kJ mol(-1), Delta H-transI(m)(K2TaF7; 746 degrees C) = 19(1) kJ mol(-1) and Delta H-transIII(m)(K2TaF7; 771 degrees C) = 13(1) kJ mol(-1). The first thermal effect was attributed to a solid-solid phase transition; the second to the incongruent melting of K2TaF7 and the third to mixing of two liquids. These findings are supported by in situ neutron powder diffraction experiments performed in the temperature interval of 654-794 degrees C.

Place, publisher, year, edition, pages
2008. Vol. 6, no 1, 27-32 p.
Keyword [en]
K2TaF7, phase transition, enthalpy changes, DSC, neutron powder diffraction
National Category
Chemical Sciences
URN: urn:nbn:se:uu:diva-113018DOI: 10.2478/s11532-007-0056-2ISI: 000252467300004OAI: oai:DiVA.org:uu-113018DiVA: diva2:289668
Available from: 2010-01-25 Created: 2010-01-25 Last updated: 2010-06-03Bibliographically approved

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