NDLI: Oxidation of Pyrite Grains: A Mössbauer Spectroscopy and Mineral Magnetism Study

Content Provider	Springer Nature Link
Author	Ferrow, E. A. Sjöberg, B. A.
Copyright Year	2006
Abstract	Fe2+ in pyrite is found in a low-spin d6 configuration, a necessary condition for diamagnetic and semi-conducting properties of material. The semi-conducting property of pyrite has been studied since the time when pyrite was used as a rectifier in early radios. Pyrite posses the highest possible crystal field stabilisation energy and offers a better altemative as solar material compared to Si-based materials. Unfortunately, pyrite is difficult to study due to its inherent deviation from stoichiometry and its ease of oxidation. Since pyrite and its oxidation products are all Fe-bearing phases, combining Mössbauer spectroscopy with mineral magnetic methods provides enough information to monitor the oxidation of pyrite in air and identify the different phases produced and their relation to different experimental parameters. For mm-sized grain samples, heating FeS2 at temperatures between 450 °C and 650 °C five different mineral assemblages are identified. FeS2 is oxidized to α-Fe2O3 along two separate routes: $${\text{FeS}}_{2} \to {\text{FeSO}}_{4} \to \varepsilon {\text{ - Fe}}_{2} {\text{O}}_{3} \to \alpha {\text{ - Fe}}_{2} {\text{O}}_{3} ;\;{\text{and}}$$ $${\text{FeS}}_{2} \to {\text{FeSO}}_{4} \to {\text{Fe}}_{2} {\left( {{\text{SO}}4} \right)}_{3} \to \beta {\text{ - Fe}}_{2} {\text{O}}_{3} \to \alpha {\text{ - Fe}}_{2} {\text{O}}_{3} $$
Starting Page	95
Ending Page	108
Page Count	14
File Format	PDF
ISSN	03043843
Journal	Hyperfine Interactions
Volume Number	163
Issue Number	1-4
e-ISSN	15729540
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-03-28
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	hysteresis magnetization Mössbauer spectroscopy pyrite susceptibility Condensed Matter Atoms, Molecules, Clusters and Plasmas Nuclear Physics, Heavy Ions, Hadrons Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry Condensed Matter Physics

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