Process for producing a high-temperature superconductor

Details Process for producing a high-temperature superconductor Process for producing a high-temperature superconductor

H - Electricity

01

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31/167, 23/224,

H01L 39/12 (2006.01) C04B 35/45 (2006.01) C04B 35/64 (2006.01) H01L 39/24 (2006.01)

Patent

CA 2015168

ABSTRACT OF THE DISCLOSURE Conventionally produced sintered ceramics of high-temperature superconductors having critical tempera- tures up to 125 K based on An1Bn2-.epsilon.1Can3+.epsilon.1Cun4On5+.epsilon.2, where A - Tl or Bi or Pb or a mixture of these three metals, B = Be or Mg or Sr or Ba or Ra or a mixture of these elements, n1 = 1 or 2, n2 = 1 or 2 or 3, n3 = 2, n4 = 2 or 3 or 4, n5 - 8 or 9 or 10 or 11, ¦.epsilon.1¦ ? 1, ¦.epsilon.2¦ < 1 have a critical current density of up to approximately 250 A/cm2 which is too low for applications of superconductors, for example, for high-power magnetic coils. In order to achieve a critical current density of > 1750 A/cm2 in such superconductors, the superconductor synthesis is carried out in a main process at a temperature in the region of 650 °C - 900 °C for a time in the region of 1 h - 100 h. Prior to this, a presynthesis heat treatment can be carried out at a temperature in the region of 650 °C - 900 °C for a time in the region of 0.5 h - 10 h for the purpose of degassing and a grain melting can be carried out at >900 °C for 1 min - 1 h for the purpose of material compaction. To establish the desired oxygen stoichiometry, a posttreatment at 300 °C - 750 °C for 0.5 h - 5 h in an oxygen atmosphere of ? 0.1 bar partial pressure can be provided after the main process.

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