HIGH-TEMPERATURE SUPERCONDUCTOR BASED ON LITHIUM PHOSPHIDE AND METHOD FOR ITS MANUFACTURE Russian patent published in 2005 - IPC

FIELD: high-temperature superconductivity and, in particular, methods for manufacture of high-temperature superconducting films, applicable in power industry, radio engineering, electronic engineering, communication systems, etc.

SUBSTANCE: the high-temperature superconduction based on lithium phosphide is made in the form of a multilayer structure including a dielectric substrate, on which a buffer diamond film and a layer of solid solution of lithium nitride in lithium phosphide with the content of lithium nitride within 4 to 7% are successively positioned. The surface of the layer of solid solution is coated with a protective diamond film. The thickness of the layer of solid solution does not exceed 2μm, and the thickness of the buffer and protective diamond films makes up 20-50 nm. A quartz fiber light-emitting diode coated with layer of silicon oxonitride, up to 50 nm thick, may be used as a dielectric substrate. For production of a high-temperature superconductor based on lithium phosphide a method is offered, consisting in the fact that a buffer diamond film is precipitated on a dielectric substrate of steam-gas mixture of methane and hydrogen placed a reactor and heated to a temperature of 500-600 C in the flow of inert gas in a low-pressure microwave plasma, then by a plasmochemical precipitation a layer of a solid solution in lithium phosphide with a content of lithium nitride within 4 to 7% is applied to the film by feeding of dried inert gas and a solid solution of phosphide and lithium nitride of a similar composition and congruently evaporated at a temperature of 450 to 550C to the zone of precipitation, after that a protective diamond film is precipitated on the layer surface.

EFFECT: enhanced critical temperature of transition up to the indoor temperature, preserved superconducting properties in prolonged service, provided formation of high-temperature superconducting thin-film structures, as well as of wire and cable in a combined process of drawing of quartz optical fiber from the respective blank; provided a double-use of optical fiber as a base of high-temperature superconductors for transmission of electric current without any loss, as well as for telecommunications, which opens wide horizons for such optofiber high-temperature superconducting structures.

3 cl, 2 dwg