US 4,369,105 AGranted

Substituted cobalt oxide spinels

AssigneeThe Dow Chemical Company

InventorsDonald L. Caldwell, Mark J. Hazelrigg, Jr.

Life of this patent

Estimating the term…

Loading patent…

Abstract

Electroconductive substrates are coated with an interface layer and then with cobalt oxide spinels conforming substantially to the empirical formula M.sub.x Z.sub.y Co.sub.3-(x+y) O.sub.4 where M represents at least one metal from the Groups IB, IIA, IIB, where Z represents at least one metal from Group IA where x is equal to or greater than zero but not greater than 1, where y is equal to or greater than zero but not greater than 0.5, and where (x plus 2y) is equal to or greater than zero but not greater than 1. The composites are prepared by thermally oxidizing metal oxide precursors in-situ on the substrate, including, optionally, modifier metal oxide materials as a separate dispersed phase in the contiguous spinel structure. The interface layer comprises at least one oxide of Pb, Sn, Sb, Al, In, or mixtures of these.

Claims20

Dependent claims

An electrically-conductive composite comprising an electrically-conductive substrate, an interface coating, and a monometal or polymetal cobalt spinel outer coating,

said interface coating comprising a layer of at least one metal oxide of the group consisting of lead oxide, tin oxide, antimony oxide, aluminum oxide, and indium oxide,
said monometal or polymetal cobalt spinel comprising at least one substituted cobalt oxide spinel conforming substantially to the empirical formula M.sub.x Z.sub.y Co.sub.3-(x+y) O.sub.4,
where M is at least one metal of the Groups IB, IIA, and IIB,
where Z is at least one metal of Group IA,
where x is greater than or equal to zero, but not greater than 1,
where y is greater than or equal to zero, but not greater than 0.5,
where (x+2y) is greater than or equal to zero, but not greater than 1, and where the amounts of M, Z, and Co are sufficient to substantially satisfy the valence requirements of oxygen in the spinel structure.

4 more elements

Dependencies are inferred from the claim text.