Ductile ceramic composite electrolyte

A non-brittle solid electrolyte composite comprising:

• an ionically conductive ceramic matrix of one of the following groups of solid oxide electrolytes:
• zirconia oxide, bismuth oxide, ceria oxide, hafnia oxide, titania oxide, samaria oxide, yttria oxide, cerbia oxide, scandia oxide, calia oxide, magnesia oxide, or gadolinia oxide;
• and a ductile metallic phase of one of the following groups of metals:
• stainless steels, iron based alloys, cobalt based alloys or nickel based alloys or superalloys, said ductile metallic phase extending throughout the body of said ceramic matrix, said ductile metallic phase of said composite comprising a continuous, interconnected, ordered, repeating ductile metallic array forming a repeating pattern structure, said ductile metallic array having thickness of 0.003 inches or less and which is embedded within, surrounded by, supporting and in intimate contact with said ceramic body substantially throughout the composite body so as to provide a high degree of interface between the ceramic and metallic array resulting in a ceramic composite which is non-brittle in practical use and which has a thickness of 0.01 inches or less.