Thermodynamics of manganese oxides: Sodium, potassium, and calcium birnessite and cryptomelane
Journal Article
·
· Proceedings of the National Academy of Sciences of the United States of America
- Peter A. Rock Thermochemistry Laboratory, University of California, Davis, CA 95616,, Nanomaterials in the Environment, Agriculture, and Technology, University of California, Davis, CA 95616,, Pratt School of Engineering, Duke University, Durham NC 27708
- Peter A. Rock Thermochemistry Laboratory, University of California, Davis, CA 95616,, Nanomaterials in the Environment, Agriculture, and Technology, University of California, Davis, CA 95616,
Significance Manganese oxides with layer and tunnel structures occur widely in the natural environment and inspire technological applications. In addition to having variable compositions, these structures often are found as small particles (nanophases). This study explores, using experimental thermochemistry, the role of composition, oxidation state, structure, and surface energy in the thermodynamic stability of synthetic birnessites and cryptomelane. These quantitative thermodynamic findings help explain and support qualitative observations of phase-transformation patterns gathered over the past five decades.
- Research Organization:
- Univ. of California, Davis, CA (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- FG02-97ER14749
- OSTI ID:
- 1341471
- Journal Information:
- Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 7 Vol. 114; ISSN 0027-8424
- Publisher:
- Proceedings of the National Academy of SciencesCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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