Magnesium Insertion and Related Structural Changes in Spinel-Type Manganese Oxides

Intercalation and Push‐Out Process with Spinel‐to‐Rocksalt Transition on Mg Insertion into Spinel Oxides in Magnesium Batteries

On the basis of the similarity between spinel and rocksalt structures, it is shown that some spinel oxides (e.g., MgCo2O4, etc) can be cathode materials for Mg rechargeable batteries around 150 °C. The Mg insertion into spinel lattices occurs via "intercalation and push-out" process to form a rocksalt phase in the spinel mother phase. For example, by utilizing the valence change from Co(III) to...

Structural 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...

Lecture notes on Manganese Oxides and Related Compounds

Microbial 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...

X-ray Diffraction and IR Spectroscopic Characterization of AgLnTiO4 Oxides Related to the K2NiF4 Structural Type

Uma série de óxidos ternários do tipo AgLnTiO 4 (com Ln = La, Nd, Sm, Eu, Gd, Dy, Y) foi preparada e os seus parâmetros de cela unitária foram determinados por difratometria de raios X. Esses compostos são relacionados com os do tipo estrutural K 2 NiF 4 , com os cátions Ag e Ln distribuídos de uma maneira ordenada no sub-retículo dos íons potássio. Os espectros de absorção no infravermelho des...