Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Coating
Patent
1998-02-03
2000-10-31
Derrington, James
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Coating
505239, 505470, 505701, H01L 3900
Patent
active
061402753
ABSTRACT:
A novel ceramic substrate useful for the preparation of superconductors, said substrate having the formula Ba.sub.2 DyMO.sub.5.5 where M represents at least one of the metals Zr, Sn and Hf and a process for the preparation of said ceramic substrate, which comprises (i) Reacting salts of dysprosium, barium and Zr, Sn or Hf in an organic medium, (ii) Pressing the resultant mixture in the form of pellets, (iii) Calcining the pellets by heating at a temperature in the range of 1000 to 1200.degree. C., (iv) Repeating the calcination process for 30-45 h at temperature in the range of 1000-1200.degree. C. until a highly homogenous mixture is formed. (v) Grinding the calcined material and pelletising at a pressure in the range of 3 to 4 tons/cm.sup.2, (vi) Sintering the resultant product at a temperature in the range of 1200 to 1600.degree. C. for a period of 10 to 30 h, and then furnace cooled to room temperature.
REFERENCES:
patent: 5314871 (1994-05-01), Nakamura
patent: 5635453 (1997-06-01), Pique et al.
patent: 5741947 (1998-04-01), Koshy
patent: 5856276 (1999-01-01), Koshy
Damodaran Alathur Damodaran
John Asha Mary
Jose Rajan
Koshy Jacob
Kumar Krishnan Sudersan
Council of Scientific & Industrial Research
Derrington James
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