Grain boundary-free crystalline body of manganese-based composite oxide and method for the preparation thereof
US5665664A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Nov 3, 1995 |
| Grant date | Sep 9, 1997 |
| Priority date | — |
| Expiry date | Nov 3, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B29/22
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Proposed is a grain boundary-free crystalline body of a perovskite structure having a chemical composition of the formula Pr.sub.1-x M.sub.x MnO.sub.3, in which M is calcium or strontium and the subscript x is a number of 0.3 to 0.5, which exhibits a magnetoresistance behavior with a phase transition between an insulator phase and a ferromagnetic metallic phase accompanied by the phenomenon of hysteresis. This grain boundary-free crystalline body can be obtained by subjecting a sintered body of a powder blend consisting of the oxides of praseodymium, manganese and calcium or strontium to a crystal growing treatment by the floating zone-melting method in an atmosphere of oxygen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.