THE OXIDATION STATE OF COPPER AND COBALT IN CARROLLITE, CuCo2S4

Pattrick, R. A.D.; Coker, V. S.; Pearce, C. I.; Telling, N. D.; van der Laan, G.

Abstract

Using X-ray absorption spectroscopy (XAS) at the Cu L2,3 and Co L2,3 edges, we demonstrate that the valence state of copper in the thiospinel carrollite (CuCo2S4) is Cu+ with a d count of Cu d9.8. The Co has a d count of d6.4, so that the highly covalent mineral has an electronic formula of Cu1.2+(Co2.4+)2(S1.5−)4. There is half a hole per atom in the S 3p band (per unit formula); the Co L2,3 XAS indicates a covalent low-spin electronic structure. These data dispel the notion of the presence of Cu2+ in carrollite.

Citation

Pattrick, R. A., Coker, V. S., Pearce, C. I., Telling, N. D., & van der Laan, G. (2008). THE OXIDATION STATE OF COPPER AND COBALT IN CARROLLITE, CuCo2S4. Canadian Mineralogist, 46(5), 1317-1322. https://doi.org/10.3749/canmin.46.5.1317

• Journal Article Type: Article
• Online Publication Date: Mar 9, 2017
• Publication Date: Oct 1, 2008
• Deposit Date: May 21, 2024
• Journal: The Canadian Mineralogist
• Print ISSN: 0008-4476
• Electronic ISSN: 1499-1276
• Publisher: Mineralogical Association of Canada
• Peer Reviewed: Peer Reviewed
• Volume: 46
• Issue: 5
• Pages: 1317-1322
• DOI: https://doi.org/10.3749/canmin.46.5.1317
• Public URL: https://keele-repository.worktribe.com/output/830845
• Publisher URL: https://pubs.geoscienceworld.org/canmin/article/46/5/1317/126943/THE-OXIDATION-STATE-OF-COPPER-AND-COBALT-IN