Layered manganese compound of the formula CA.sub.2 MN.sub.3 O.sub.8
US4049790A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1976 |
| Grant date | Sep 20, 1977 |
| Priority date | — |
| Expiry date | Jun 3, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A new low temperature layered manganese compound of the formula Ca.sub.2 Mn.sub.3 O.sub.8 has unexpectedly been synthesized in pure form. The unit cell dimensions of this new compound have been determined by X-ray diffraction and reveal that the compound is monoclinic with lattice parameters of a=11.02 A, b=5.85 A, c=4.94 A, .alpha.=90.degree., .beta.=109.80.degree., .gamma.=90.degree.. The structure consists of pseudohexagonal Mn.sup.4+ sheets with similar oxygen sheets on either side, giving a distorted octahedral coordination to the Mn.sup.4+. Every fourth Mn.sup.4+ is missing in these layers, so their composition is Mn.sub.3 O.sub.8 with chains of coordination octahedra linked by common edges (rutile type arrangement). The Ca ions are situated between the Mn.sub.3 O.sub.8 layers. This new Ca.sub.2 Mn.sub.3 O.sub.8 compound is prepared in pure form by means of the solid solution precursor technique whereby solid solution, mixed metal carbonates of the desired metals (Ca and Mn) having the calcite structure are precipitated from mixtures of the solutions of the salts of calcium and manganese, said salts being selected from the group consisting of carbonates, nitrates, sulfates, o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.