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The solid solution between platinum and palladium in nature

Published online by Cambridge University Press:  05 July 2018

L. Bindi
Affiliation:
Dipartimento di Scienze della Terra, Università degli Studi di Firenze, via La Pira 4, I-50121 Firenze, Italy
F. Zaccarini
Affiliation:
Department of Applied Geosciences and Geophysics, University of Leoben, Peter Tunner str. 5, A-8700 Leoben, Austria
G. Garuti
Affiliation:
Department of Applied Geosciences and Geophysics, University of Leoben, Peter Tunner str. 5, A-8700 Leoben, Austria
N. Angeli
Affiliation:
UNESP-IGCE, Departamento de Petrologia e Metalogenia, Universidade Estadual Paulista, Av. 24-A, nº 1515, 13506-900, Rio Claro 13500, SP, Brazil
Corresponding
E-mail address:

Abstract

Chemical and structural data are reported for platinum–palladium intermediates from two nuggets found at Córrego Bom Sucesso, Minas Gerais, Brazil. Three grains with simple stoichiometries (i.e. PtxPd1−x with x ∼0.67, ∼0.5 and ∼0.33, which correspond to Pt2Pd, PtPd and PtPd2, respectively) were characterized by single-crystal X-ray diffraction and electron-probe microanalysis. In the absence of single-crystal data it might be tempting to hypothesize that such simple stoichiometries represent distinct mineral species, however structural analyses show that all of the phases are cubic and crystallize in space group Fm m. They are, therefore, natural intermediates in the palladium–platinum solid solution. Reflectance and micro-hardness values are reported for the samples and a comparison with the pure metallic elements made. On the basis of information gained from the chemical and structural characterization it can be concluded that there is a complete solid solution between Pt and Pd in nature. These findings corroborate results from experiments on synthetic compounds.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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