Method of making lead-rich and bismuth-rich pyrochlore compounds using an alkaline medium and a reaction enhancing anodic potential
US4192780A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1978 |
| Grant date | Mar 11, 1980 |
| Priority date | — |
| Expiry date | Nov 1, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01M12/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A liquid solution method of preparing electrically conductive pyrochlore compounds of high surface area, having the formula: EQU A.sub.2 [B.sub.2-x A.sub.x ]O.sub.7-y is disclosed wherein A is selected from lead, bismuth and mixtures thereof, B is selected from ruthenium, iridium and mixtures thereof, 0<.times..ltoreq.1.0 and 0.ltoreq.y.ltoreq.1. The method involves reacting A and B cations to yield a pyrochlore oxide by precipitation of A and B cations from an aqueous solution source of these cations in a liquid alkaline medium having a pH of at least about 10.0 in the presence of an oxygen source, and in the presence of a reaction-enhancing anodic potential, at a temperature below about 200.degree. C. for a sufficient time for reaction to occur.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.