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Determination of the melting temperature of kaolinite by means of the Z-method
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.ORCID iD: 0000-0001-7531-3210
2013 (English)In: American Mineralogist, ISSN 0003-004X, Vol. 98, no 10, 1881-1885 p.Article in journal (Refereed) Published
Abstract [en]

The melting temperature of materials is an important thermodynamic property. Despite the importance of kaolinite, one of the most common clay minerals on the Earth's surface, its thermal and melting behavior is poorly understood. We apply here the Z-method to determine the melting temperature (T-m) and the limit of superheating (T-LS) of kaolinite. The T-m is found at 1818 K (8.85 GPa), and T-LS at 1971 K (6.8 GPa). The diffusion coefficient for all atoms has been calculated in a broad temperature range. The calculated characteristics and, in particular, their dependence on temperature have confirmed the solid-liquid transition and strongly support the calculated melting point. In addition, some computed quantities, such as the radial distribution function, coordination numbers and mean-square displacement, were used to confirm the liquid state of kaolinite from the melting temperature as well as at other temperatures in the liquid branch. The diffusion coefficient for different atoms has been calculated throughout the isochore. These quantities and in particular their evolution under temperature have confirmed the solid-liquid states of kaolinite and the presence of the melting point. The latter quantity constitutes the first ever melting simulation of a clay mineral with close agreement to the experimental one.

Place, publisher, year, edition, pages
2013. Vol. 98, no 10, 1881-1885 p.
Keyword [en]
Kaolinite, melting, molecular dynamics, Z-method
National Category
URN: urn:nbn:se:kth:diva-134743DOI: 10.2138/am.2013.4379ISI: 000326357400025ScopusID: 2-s2.0-84885055993OAI: diva2:669201
Swedish Research Council

QC 20131203

Available from: 2013-12-03 Created: 2013-11-28 Last updated: 2013-12-03Bibliographically approved

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Belonoshko, Anatoly B.
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Condensed Matter Theory
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