Journal of


  (Formerly Journal of the Czech Geological Society)

Original paper

František Laufek, Anna Vymazalová, Marek Tuhý

Ag, Cu, Hg, Pt, Sb and Te substitutions in the synthetic analogue of palladseite, Pd17Se15: an experimental mineralogical study

Journal of Geosciences, volume 66 (2021), issue 4, 205 - 213


The solubility of Ag, Cu, Hg, Pt, Sb and Te in the synthetic analogue of palladseite was experimentally studied at 350 °C. To document the impact of these elements on the palladseite crystal structure, Rietveld refinement analysis of experimental products was performed. The synthetic Pd17Se15 dissolves at 400 °C 3.6, 6.4, 8.8, 9.7, 6.1 wt. % of Cu, Ag, Hg, Pt and Te, respectively. The solubility of Sb in synthetic Pd17Se15 is less than 0.03 wt. %. Three different types of incorporation of the above-mentioned elements to the palladseite structure have been observed. Ag, Cu and Hg occupy a position 3d of the Pm-3m space group, which was empty in the unsubstituted Pd17Se15. Consequently, Pd occupancy of adjacent [Pd(4)Se6] octahedron is reduced to 0.46 and 0.51 for Cu and Ag-bearing palladseite, respectively. Incorporation of Hg to the palladseite structure causes vacancy of this Pd(4) position. Pt partially substitutes Pd at the Pd(2) position (6f ), forming Pd0.41/Pt0.59 mix site showing square-planar coordination by Se atoms. Te atoms substitute for Se. The refined unit-cell parameter increased from the initial value of a = 10.6074(1) Å for Pd17Se15 to 10.6680(1) Å for Te-bearing palladseite. Incorporation of Cu, Ag and Hg to the palladseite causes significant changes of its powder X-ray diffraction pattern and hence can be detected by PXRD.

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ISSN: 1802-6222

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