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Abstract

The present invention relates to solid materials for use as solid electrolytes for a fuel cell. Specifically, the invention relates to a solid O.sup.2- conducting material for use as an electrolyte for a fuel cell, comprising: a monocrystal or polycrystal structure of the formula: A.sub.1-x B.sub.x Z, wherein A is independently selected from lanthanum, cerium, neodymium, praseodymium, scandium or mixtures thereof; B is independently selected from strontium, calcium, barium or magnesium, and x is between about 0 and 0.9999, Z is selected from the group consisting of F.sub.3-x and O.sub.c F.sub.d where F is fluorine, O is oxygen, x is between about 0 and 0.9999 and 2c+d=3-x, wherein c is between 0.0001 and 1.5 and d is between 0.0001 and less than or equal to 3, with the proviso when A is lanthanum, Z is F.sub.3-x and x is 0, the solid material is only a monocrystal. In another aspect the present invention relates to a composite fuel cell of thin lanthanum strontium fluoride having a laminate (composite)-type structure. In another aspect, the solid electrolyte for a fuel cell is a monocrystal or polycrystal structure of Pb.sub.e Sn.sub.f F.sub.g, where Pb is lead and Sn is tin. The invention also includes the use of the solid electrolyte fuel cells disclosed to generate electricity.

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First Claim