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Oxidation of pyrite grains: A Mossbauer spectroscopy and mineral magnetism study

Ferrow, Embaie LU and Sjoberg, BA (2005) In Hyperfine Interactions 163(1-4). p.95-108
Abstract
Fe2+ in pyrite is found in a low-spin d(6) 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 Mossbauer spectroscopy with mineral magnetic methods provides enough information to monitor the oxidation of pyrite in air and identify... (More)
Fe2+ in pyrite is found in a low-spin d(6) 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 Mossbauer 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 degrees C and 650 degrees C five different mineral assemblages are identified. FeS2 is oxidized to alpha-Fe2O3 along two separate routes: FeS2 -> FeSO4 -> epsilon-Fe2O3 -> alpha-Fe2O3; and FeS2 -> FeSO4 -> Fe-2 (SO4)(3) -> ss-Fe2O3 -> alpha-Fe2O3. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Mossbauer spectroscopy, hysteresis, magnetization, pyrite, susceptibility
in
Hyperfine Interactions
volume
163
issue
1-4
pages
95 - 108
publisher
Springer
external identifiers
  • wos:000238519200007
  • scopus:33745508149
ISSN
1572-9540
DOI
10.1007/s10751-005-9199-8
language
English
LU publication?
yes
id
b9f6c730-9f5f-4f8c-9b30-fc12c4ecd2e7 (old id 404942)
date added to LUP
2007-08-20 16:43:44
date last changed
2017-01-01 05:04:12
@article{b9f6c730-9f5f-4f8c-9b30-fc12c4ecd2e7,
  abstract     = {Fe2+ in pyrite is found in a low-spin d(6) 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 Mossbauer 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 degrees C and 650 degrees C five different mineral assemblages are identified. FeS2 is oxidized to alpha-Fe2O3 along two separate routes: FeS2 -> FeSO4 -> epsilon-Fe2O3 -> alpha-Fe2O3; and FeS2 -> FeSO4 -> Fe-2 (SO4)(3) -> ss-Fe2O3 -> alpha-Fe2O3.},
  author       = {Ferrow, Embaie and Sjoberg, BA},
  issn         = {1572-9540},
  keyword      = {Mossbauer spectroscopy,hysteresis,magnetization,pyrite,susceptibility},
  language     = {eng},
  number       = {1-4},
  pages        = {95--108},
  publisher    = {Springer},
  series       = {Hyperfine Interactions},
  title        = {Oxidation of pyrite grains: A Mossbauer spectroscopy and mineral magnetism study},
  url          = {http://dx.doi.org/10.1007/s10751-005-9199-8},
  volume       = {163},
  year         = {2005},
}