Preparation and crystal structure refinement of Li{sub 4}Mn{sub 5}O{sub 12} by the Rietveld method
- National Institute of Materials and Chemical Research, Ibaraki (Japan)
Well-crystallized Li{sub 4}Mn{sub 5}O{sub 12} powder has been prepared by heating a eutectic mixture of lithium acetate LiOAc and manganese nitrate Mn(NO{sub 3}){sub 2} at 700{degrees}C for 1-3 days in an O{sub 2} atmosphere. The Li and Mn content in the final products was determined from atomic absorption spectroscopy. The tetravalent manganese in the final product was found to be 95% based on the active oxygen content determined by KMnO{sub 4} titration. The structure of Li{sub 4}Mn{sub 5}O{sub 12} crystallites was refined by the Rietveld method from powder X-ray diffraction data as a cubic spinel, a = 8.1616(5) {angstrom}, space group Fd{bar 3}m. Li{sub 4}Mn{sub 5}O{sub 12} crystallites are stable at temperatures up to 600{degrees}C in oxygen but decompose to spinel LiMn{sub 2}O{sub 4} and monoclinic Li{sub 2}MnO{sub 3} at temperatures higher than 530{degrees}C in N{sub 2}.
- OSTI ID:
- 75768
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 115; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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