Abstract: Composites comprising at least one hollow fiber of oxygen-transporting ceramic material, which is a ceramic material which conducts oxygen anions and electrons or a combination of ceramic material which conducts oxygen anions and a ceramic or nonceramic material which conducts electrons, with the outer surface of the hollow fiber being in contact with the outer surface of the same hollow fiber or another hollow fiber and the contact points being joined by sintering, are described. Further composites comprise at least one hollow fiber of oxygen-transporting ceramic material which is a ceramic material which conducts oxygen anions and electrons or a combination of ceramic material which conducts oxygen anions and ceramic or nonceramic material which conducts electrons and a connection element for the introduction or discharge of fluids at at least one end face, with hollow fibers and connection element being joined.

Abstract: Composites comprising at least one hollow fibre of oxygen-transporting ceramic material, which is a ceramic material which conducts oxygen anions and electrons or a combination of ceramic material which conducts oxygen anions and a ceramic or nonceramic material which conducts electrons, with the outer surface of the hollow fibre being in contact with the outer surface of the same hollow fibre or another hollow fibre and the contact points being joined by sintering, are described. Further composites comprise at least one hollow fibre of oxygen-transporting ceramic material which is a ceramic material which conducts oxygen anions and electrons or a combination of ceramic material which conducts oxygen anions and ceramic or nonceramic material which conducts electrons and a connection element for the introduction or discharge of fluids at at least one end face, with hollow fibres and connection element being joined.

Abstract: Composites comprising at least a hollow fiber for the gas- or liquid-transporting ceramic material whose outer surface is in contact with the outer surface of the same or another hollow fiber and the contact sites are joined by sintering are described. Additional composites include at least one hollow fiber from gas- or liquid-transporting ceramic material and at least a connection element for feed or discharge of fluids on at least one of the ends, in which hollow fibers are joined to the connection element by sintering. The composites can be used for recovery of gases from gas mixtures.