Hot pressing of YBCO-type superconductors

Compounds of YBa1.95K0.05Cu3Oz, YBa1.95K0.05Cu2.97Zn0.03Oyand YBa1.95K0.05Cu2.97Co0.03Oxcomposition were prepared sintering at 950°C in oxygen atmosphere. It has been established that more non-superconductive phase is formed when replacing copper ions with cobalt or zinc ions. These ions increase th...

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Bibliographic Details
Published in:Superlattices and microstructures 1997-04, Vol.21 (3), p.435-446
Main Authors: Kotsis, I., Enisz, M., Korim, T.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Electrotechnical and electronic ceramics
Exact sciences and technology
hot pressing
superconductors
Technical ceramics
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Summary:Compounds of YBa1.95K0.05Cu3Oz, YBa1.95K0.05Cu2.97Zn0.03Oyand YBa1.95K0.05Cu2.97Co0.03Oxcomposition were prepared sintering at 950°C in oxygen atmosphere. It has been established that more non-superconductive phase is formed when replacing copper ions with cobalt or zinc ions. These ions increase the amount of amorphous phase too. The effects of Co2+ions is stronger than that of Zn2+ions. These compounds first peritectically melt, then crystallization takes place from the melt when hot pressed between 900°C and $920°C at 12 MPa pressure for 2 hours in oxygen atmosphere. The pores larger than 2.5 μm disappear when the liquid phase appears, while microporosity does not change significantly. The size of the largest crystalline particles in hot pressed samples is 5 μm, which is about the 4th can be produced by atmospheric sintering. Among physical properties current density at 77 K was influenced most disadvantageously by hot pressing.
ISSN:0749-6036
1096-3677
DOI:10.1006/spmi.1996.0414