Method of making lead and bismuth pyrochlore compounds using an alkaline medium and at least one solid reactant source
AssigneeExxon Research & Engineering Co.
InventorsHarold S. Horowitz, John M. Longo, Joseph T. Lewandowski
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Abstract
A method of preparing electrically conductive pyrochlore compounds having the formula: A.sub.2 [B.sub.2-x A.sub.x ]0.sub.7-y is disclosed wherein A is selected from lead, bismuth and mixtures thereof, B is selected from ruthenium, iridium and mixtures thereof, O.ltoreq.x.ltoreq.1.0 and 0.ltoreq.y.ltoreq.1. The method involves reacting A and B cations using at least one solid reactant source of these cations in a liquid alkaline medium having a pH of at least about 13.5 in the presence of an oxygen source at a temperature below about 200.degree. C. for a sufficient time for reaction to occur.
Claims42
A method of preparing compounds having the formula:
- ti A.sub.2 [B.sub.2-x A.sub.x ]O.sub.7-y
- wherein A is selected from the group consisting of lead, bismuth and mixtures thereof, wherein B is selected from the group consisting of ruthenium, iridium and mixtures thereof, wherein x is a value such that 0.ltoreq.x.ltoreq.1.0 and y is a value such that 0.ltoreq.y.ltoreq..ltoreq.1, comprising:
- reacting A cations and B cations from at least one solid cation reactant source in a liquid alkaline medium having a pH of at least about 13.5 in the presence of an oxygen source at a temperature below about 200.degree. C. for a sufficient time for reaction to occur.
Dependencies are inferred from the claim text.