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 |
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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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