منابع مشابه
Electronic Structures of Iron and Manganese Oxides with Applications to Their Mineralogy
The electronic structures of iron and manganese oxide and related minerals are investigated using Self-Consistent Field Xa Scattered Wave molecular orbital calculations on finite atomic clusters. Calculations on Fe0 6, FeO4, MnO6 and Fe04(OH)2 coordination polyhedra are used to investigate the nature of chemical bonds, electronic spectra, magnetism, and mechanisms of electron transport in these...
متن کاملMicrobial formation of manganese oxides.
Microbial manganese oxidation was demonstrated at high Mn concentrations (5 g/liter) in bacterial cultures in the presence of a microalga. The structure of the oxide produced varied depending on the bacterial strain and mode of culture. A nonaxenic, acid-tolerant microalga, a Chlamydomonas sp., was found to mediate formation of manganite (gamma-MnOOH). Bacteria isolated from associations with c...
متن کاملMineralogy and geochemistry of the Hajiabad manganese deposit, Hormozgan province
The Hajiabad manganese deposit is located about 40 km northeast of Hajiabad, Hormozgan Province. This deposit is structurally located in the southeastern border of the Sanandaj-Sirjan zone. The manganese mineralization in the study area is hosted by calcite-dolomitic marbles and mica schists of Devonian age, as layers, veins and massive ores. Based on microscopic investigations, the ores are do...
متن کاملThe association of cobalt with iron and manganese (oxyhydr)oxides in marine sediment
Formation and dissolution of authigenic Fe and Mn (oxyhydr)oxides influence cycling of trace metals in oxic/suboxic surface sediments. We used the diffusive gradients in thin films technique (DGT) to estimate the association of cobalt with iron and manganese oxides. We compared Co, Fe and Mn maxima measured by DGT in the pore waters of fresh and aged marine sediment cores and estimated the Co/F...
متن کاملStructural stability of lithium manganese oxides
We have studied stability of lithium-manganese oxides using density functional theory in the local density and generalized gradient approximation ~GGA!. In particular, the effect of spin-polarization and magnetic ordering on the relative stability of various structures is investigated. At all lithium compositions the effect of spin polarization is large, although it does not affect different st...
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ژورنال
عنوان ژورنال: Oceanography in Japan
سال: 1995
ISSN: 0916-8362,2186-3105
DOI: 10.5928/kaiyou.4.269