Oxidhydroxide von Mangan (IV) mit Schichtengitter: Einbau von Co, Ni, Cu in Lithiophorit

Abstract

Lithiophorite was synthesized by hydrothermal methods at 200-400°C and 90-130 bar in order to determine the limit for insertion of Co, Ni, and Cu into the lattice. Analyses, X-ray diffraction, and electron microscopy have shown that 0.6 Co (per unit LiAl₂Mn₃O₉∙3H₂O) may be inserted into the Mn₃O₆^⊖ layers while 0.5 Ni and Cu, respectively, could be inserted into the Li,Al layers. Authors assume the formation of clusters of Co-O octahedra whereas Ni sits in Li positions. The ion exchange properties of lithiophorite are poor and in acid suspensions the hydrogen bonds are attacked which leads to the disruption of the lattice and the nucleation of γ-MnO₂.