The solid solutions of rebulite and jankovićite in the phase system Tl2S-As2S3-Sb2S3

Authors

  • Tonci Balic-Zunic Natural History Museum, University of Copenhagen, Øster voldgade 5-7, 1350 Copenhagen K
  • Yves Moëlo bInstitut des Matériaux Jean Rouxel, UMR 6502, CNRS, Université de Nantes, 2, rue de la Houssinière, 44 322 Nantes Cedex 3
  • Ljiljana Karanović University of Belgrade, Faculty of Mining and Geology, Laboratory of Crystallography, Ðušina 7, 11000 Belgrade
  • Peter Berlepsch CH-4055 Basel

DOI:

https://doi.org/10.20450/mjcce.2015.676

Keywords:

rebulite, jankovićite, As/Sb solid solution, Tl2S-As2S3-Sb2S3 phase system

Abstract

Syntheses along the Tl5(As,Sb)13S22 compositional line in the Tl2S-As2S3-Sb2S3 phase system showed that the compositional range of rebulite extends from  Tl5As9.5Sb3.5S22 to Tl5As7.75Sb5.25S22. The Sb-rich end-member is in equilibrium with jankovićite of ideal composition Tl5Sb7.5As5.5S22. It is considered to be the As-rich end-member of the jankovićite solid solution. The crystal structure analyses of crystals from the As and Sb end-members of rebulite show that the Sb/As substitution is present in Sb3, Sb4, Sb5, As1 and As2 structural sites. Of them, Sb3 is always Sb dominated whereas other four vary from As- to Sb-dominated over the range of the solid solution. The change of the structural topology from jankovićite to rebulite, the closely related but not identical structures, is explained through necessity to accommodate the smaller volumes of the As coordination polyhedra and is accomplished through unit-cell twinning over the periodic (001)reb twin boundaries. The As end-member of the rebulite solid solution is in equilibrium with the phase of Tl2.4Sb0.68As7.18S13 ideal composition, interpreted as imhofite.

Author Biography

Tonci Balic-Zunic, Natural History Museum, University of Copenhagen, Øster voldgade 5-7, 1350 Copenhagen K

Section of Geobiology and Mineralogy

Associate Professor

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Published

2015-06-02

How to Cite

Balic-Zunic, T., Moëlo, Y., Karanović, L., & Berlepsch, P. (2015). The solid solutions of rebulite and jankovićite in the phase system Tl2S-As2S3-Sb2S3. Macedonian Journal of Chemistry and Chemical Engineering, 34(1), 125–132. https://doi.org/10.20450/mjcce.2015.676

Issue

Vol. 34 No. 1 (2015)

Section

Inorganic Chemistry

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