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Ceramic high-temperature superconductors have been known to the general public since the mid-1980s.

They are technically interesting on account of their high current carrying capacity and high transition temperature, for example 92 K for YBa2Cu3O7 or 110 K for Bi2Sr2Ca2Cu3O10, which permits the use of liquid nitrogen as low-cost coolant and therefore simplifies the cryotechnical requirements.

As ceramic materials are brittle, shaped parts like flexible wires cannot be produced monolithically. This principal problem has been solved according to the state of the art with the filling of the powder ceramic material into a metal tube with subsequent rolling to wire. In this way, underground cables in a length of 1 000 m can be produced as tested for around two years as part of a project in Essen.

Further applications for such superconductors are for instance: motors, transformers, SMES for energy storage, SQID sensors for detection of weak magnetic fields, MRT systems for medical diagnostics or sender and receiver stages in telecommunications.

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