| abstract |
The material according to the invention is based on a substance having the composition Ln 6 WO 12 with a defect fluorite structure, in which at least some of the cations have been substituted in a defined manner in the A and/or B positions. Said material has the following composition: Ln 1-x A x ) 6 (W 1-y B y ) z O 12- n δ where Ln = an element from the group (La, Pr, Nd, Sm), A = at least one element from the group (La, Ce, Pr, Nd, Eu, Gd, Tb, Er, Yb, Ca, Mg, Sr, Ba, Th, In, Pb), B = at least one element from the group (Mo, Re, U, Cr, Nb), 0 ≤ x ≤ 0.7 and 0 ≤ y ≤ 0.5, where, however, either x or y > 0, 1.00 ≤ z ≤ 1.25 and 0 ≤ δ ≤ 0.3. The material which conducts a mixture of protons and electrons has improved mixed conductivity, good chemical stability as well as good sintering properties, and it can be used in particular as a substance for a hydrogen-separating membrane, or as electrolyte at higher temperatures. |