Microstructure and superconducting properties of hot-pressed Bi--Pb--Sr--Ca--Cu--O thick film

Journal Article · Mon Jul 01 00:00:00 EDT 1991 · Journal of Materials Research; (USA)

DOI:https://doi.org/10.1557/JMR.1991.1425· OSTI ID:5730972

Murayama, N; Kodama, Y; Sakaguchi, S; Wakai, F ^[1]

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1. Government Industrial Research Institute-Naogya, 1-1 Hirate-cho, Kita-ku, Nagoya 462, Japan (JP)

Superconducting Bi{sub 1.84} Pb{sub 0.34} Sr{sub 2.03} Ca{sub 1.9} Cu{sub 3.06} O{sub {ital y}} thick films were prepared on MgO substrates by screen printing with the powder consisting almost entirely of the 110 K phase. The thick film sandwiched between the two MgO substrates was then hot-pressed in air under various conditions. The thickness of the film was 20--40 {mu}m. The degree of grain orientation was quantitatively evaluated through the image analysis on the SEM micrographs for the chemically etched cross sections of the samples. The degree of grain orientation and the critical current density ({ital J}{sub {ital c}}) increased with increasing hot-pressing temperature. When hot-pressed at 855 {degree}C under a constant pressure of 500 kg/cm{sup 2} for 270 min, the {ital J}{sub {ital c}} had a maximum value of 9500 A/cm{sup 2} (77 K, 0 Oe), and the critical temperature was 110 K. When the hot-pressing pressure was higher than 200 kg/cm{sup 2}, the degree of grain orientation was almost independent of hot-pressing pressure. Nevertheless, the {ital J}{sub {ital c}} increased with increasing hot-pressing pressure. The relationship between the magnetic field dependence of {ital J}{sub {ital c}} and hot-pressing conditions was examined.

• OSTI ID: 5730972
• Journal Information: Journal of Materials Research; (USA), Journal Name: Journal of Materials Research; (USA) Vol. 6:7; ISSN JMREE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
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MICROSTRUCTURE
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