Computational investigations of symmetry and coupled substitutions in natrolite group minerals

Váczi Tamás and Warren Michele C.: Computational investigations of symmetry and coupled substitutions in natrolite group minerals. In: Acta mineralogica-petrographica, (45) 1. pp. 113-117. (2004)

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Abstract

Empirical interatomic potentials and energy minimisation techniques were used to test atomic configurations of two minerals of the NAT zeolite topology, natrolite and gonnardite. The natrolite structure (Artioli et al., 1984) was found not to be stable in the empirical Fddl space group. With symmetry constraints released during minimisation, the structure relaxed either with a slight triclinic distortion or to an unphysical configuration, though intermediate steps during minimisation showed first monoclinic and later triclinic symmetry. In the gonnardite structure (Artioli and Torres Salvador, 1991), simulations with full cation disorder but only some of the extraframework water molecules included showed a positive correlation between the cell parameters and Ca content. Since the averaging of potentials does not properly represent disorder in extraframework and coupled sites, we instead built a model structure with full order in extraframework cation sites and the proper number of water molecules. Energetically favourable locations for H2 0 molecules relative to Ca atoms were found only in the latter model.

Item Type: Article
Journal or Publication Title: Acta mineralogica-petrographica
Date: 2004
Volume: 45
Number: 1
ISSN: 0365-8066
Page Range: pp. 113-117
Language: English
Publisher: Department of Mineralogy, Geochemistry and Petrology, University of Szeged
Place of Publication: Szeged
Related URLs: http://acta.bibl.u-szeged.hu/39426/
Uncontrolled Keywords: Földtan, Ásványtan, Kőzettan
Additional Information: Bibliogr.: 117. p. ; ill. ; összefoglalás angol nyelven
Subjects: 01. Natural sciences
01. Natural sciences > 01.05. Earth and related environmental sciences
Date Deposited: 2016. Oct. 17. 09:24
Last Modified: 2022. Aug. 24. 14:54
URI: http://acta.bibl.u-szeged.hu/id/eprint/25122

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