Method of preparing di and poly chalcogenides of group VIIb by low temperature precipitation from nonaqueous solution and small crystallite size stoichiometric layered dichalcogenides of rhenium and technetium
US4308171A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1980 |
| Grant date | Dec 29, 1981 |
| Priority date | — |
| Expiry date | Jul 16, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S65/15
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Finely divided, small particle (0.1 micron or less) small crystallite (about 50 A.times.100 A or less) chalcogenides of manganese, rhenium and technetium are described. These compositions are prepared by mixing the absence of an aqueous solvent, a manganese, rhenium or technetium salt with a source of chalcogenide yielding a precipitate. The manganese, rhenium or technetium salt and the source of chalcogen can be mixed either neat or in the presence of a nonaqueous aprotic solvent. The precipitate which results before removal of the anion salt is a finely divided product. In the case of rhenium dichalcogenide the product possesses a layered structure. The anion salt may be removed by any technique common to the art, pumping under vacuum being one such technique, washing with a suitable solvent being another. A method is described for the preparation of di- and poly-chalcogenides of the formula MX.sub.y wherein M is a metal selected from the group consisting of mangangese, rhenium and technetium, X is a chalcogen selected from the group consisting of sulfur, selenium, tellurium and mixtures thereof, and y is a number ranging from about 1.5 to about 4, preferably about 2, comprising …
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