Synthesis and stability of single-phase chalcopyrite - a potential reference material for key investigations in chemistry and metallurgical engineering.

Autor: Frenzel N; TU Bergakademie Freiberg, Institute of Inorganic Chemistry Leipziger Str. 29 09599 Freiberg Germany frisch@tu-freiberg.de., Mehne M; TU Bergakademie Freiberg, Institute of Energy Process Engineering and Chemical Engineering, Chair of Reaction Engineering Fuchsmühlenweg 9 09599 Freiberg Germany., Bette S; Max-Planck-Institute for Solid State Research Heisenbergstr. 1 70569 Stuttgart Germany., Kureti S; TU Bergakademie Freiberg, Institute of Energy Process Engineering and Chemical Engineering, Chair of Reaction Engineering Fuchsmühlenweg 9 09599 Freiberg Germany., Frisch G; TU Bergakademie Freiberg, Institute of Inorganic Chemistry Leipziger Str. 29 09599 Freiberg Germany frisch@tu-freiberg.de.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2021 Jan 15; Vol. 11 (5), pp. 3153-3161. Date of Electronic Publication: 2021 Jan 15 (Print Publication: 2021).
DOI: 10.1039/d0ra09700d
Abstrakt: Single-phase chalcopyrite (CuFeS 2 ) is a key reference material in the development of new metallurgical processes to ensure a reliable copper supply. Here, we report on the successful synthesis of single-phase chalcopyrite and its phase behaviour. We further rationalise different opinions previously expressed in the literature. Chalcopyrite synthesis has been studied at 450 °C with varying sulfur contents and analysed using X-ray powder diffraction (XRPD) and 57 Fe-Mössbauer spectroscopy. With stoichiometric amounts (Cu : Fe : S = 25 : 25 : 50) the main chalcopyrite phase is contaminated with pyrite (FeS 2 ) and bornite (Cu 5 FeS 4 ). Single-phase chalcopyrite was only found in samples containing around 49.7 at% sulfur in the reactant mixture. Mößbauer spectroscopy confirmed that chalcopyrite contains trivalent iron. Temperature dependent XRPD measurements detected an order-disorder phase transition starting at 485 °C. At temperatures above 535 °C, samples only contained intermediate solid solutions. These adopt the sphalerite structure with the lattice constant slightly varying with Cu : Fe ratio.
Competing Interests: There are no conflicts of interest to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
Externí odkaz: