Oxygen-enrichment of YBa2Cu3 YBa2Cu3O7-δ using the fluidization techniqueusing the fluidization technique |
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| Authors: | U V Varadaraju G V Subba Rao K D Chandrasekaran A Baradarajan K Krishnaiah Mukesh Agarwala V S Achutharaman P Venugopal K A Padmanabhan L S Vaidyanathan G Rangarajan |
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| Affiliation: | (1) Materials Science Research Centre, Indian Institute of Technology, 600 036 Madras, India;(2) Department of Chemical Engineering, Indian Institute of Technology, 600 036 Madras, India;(3) Department of Metallurgical Engineering, Indian Institute of Technology, 600 036 Madras, India;(4) Department of Physics, Indian Institute of Technology, 600 036 Madras, India |
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| Abstract: | The oxygen-deficient phase of the highT
c superconductor, YBa2Cu3O7, was oxygen-enriched using the fluidization technique to give good superconducting properties. The normal method of oxygen
treatment at 900°C for 24 h and at 600°C for 24 h has been reduced to just one treatment at 600°C for 12 h by the fluidization
technique to achieve almost the same strength of superconducting signal for the YBa2Cu3O7 powder, which establishes the attractiveness of the latter route for the large-scale preparation of superconducting material.
The particle sizes were in the range 0–90, 90–180 and 180–420 μm. The fluidized particles were crystalline with orthorhombic
distortion.T
c
onset
, estimated using the a.c. magnetic susceptibility method, was 91·3 K. The volume fraction of superconducting material in
the product was 83·7–85·3%, one of the highest values reported so far for YBa2Cu3O7. |
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| Keywords: | High temperature superconductivity YBa2Cu3O7 fluidization |
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