Next Article in Journal
Handling of Human-Geosphere Intersections
Previous Article in Journal
Evaluation of VIIRS Land Surface Temperature Using CREST-SAFE Air, Snow Surface, and Soil Temperature Data
Article Menu

Export Article

Open AccessArticle

Gibbs Free Energy of Formation for Selected Platinum Group Minerals (PGM)

Department of Geology and Geoenvironment, National University of Athens, Panepistimiopolis, Athens 15784, Greece
Author to whom correspondence should be addressed.
Geosciences 2016, 6(1), 2;
Received: 6 October 2015 / Revised: 11 December 2015 / Accepted: 14 December 2015 / Published: 6 January 2016
PDF [3861 KB, uploaded 13 January 2016]


Thermodynamic data for platinum group (Os, Ir, Ru, Rh, Pd and Pt) minerals are very limited. The present study is focused on the calculation of the Gibbs free energy of formation (ΔfG°) for selected PGM occurring in layered intrusions and ophiolite complexes worldwide, applying available experimental data on their constituent elements at their standard state (ΔG = G(species) − ΔG(elements)), using the computer program HSC Chemistry software 6.0. The evaluation of the accuracy of the calculation method was made by the calculation of (ΔGf) of rhodium sulfide phases. The calculated values were found to be ingood agreement with those measured in the binary system (Rh + S) as a function of temperature by previous authors (Jacob and Gupta (2014). The calculated Gibbs free energy (ΔfG°) followed the order RuS2 < (Ir,Os)S2 < (Pt, Pd)S < (Pd, Pt)Te2, increasing from compatible to incompatible noble metals and from sulfides to tellurides. View Full-Text
Keywords: platinumgroup minerals; standard Gibbs free energy; thermodynamics platinumgroup minerals; standard Gibbs free energy; thermodynamics

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Olivotos, S.; Economou-Eliopoulos, M. Gibbs Free Energy of Formation for Selected Platinum Group Minerals (PGM). Geosciences 2016, 6, 2.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Geosciences EISSN 2076-3263 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top