Structural and superconducting properties of melt grown Y{endash}Ba{endash}Cu{endash}O superconductors
- Defence Metallurgical Research Laboratory, Hyderabad 500 258 (India)
- Department of Physics, Indian Institute of Technology, Madras 600 036 (India)
- Inter University Consortium for DAE facilities, University Campus, Khandwa Road, Indore 452001 (India)
YBa{sub 2}Cu{sub 3}O{sub 7} (123) samples with varying Y{sub 2}BaCuO{sub 5} (211) concentrations (0 mol{percent}, 20 mol{percent}, 28 mol{percent}, and 50 mol{percent}) were synthesized by melt growth process. Microstructural characterizations were done using x-ray diffraction (XRD), optical microscopy, sanning electron microscopy, and transmission electron microscopy (TEM). It was found that 123 platelet width, crack width between the platelets, and 211 particle size decreased systematically with increasing 211 concentration. TEM study showed that there is a critical radius of curvature ({ital r}{sub {ital c}}{le}0.2 {mu}m{minus}0.3 {mu}m) of the 123/211 interface where defects/contrasts of strain field start to appear, and these defects are believed to be responsible for pinning the magnetic flux. Microhardness measurements showed that Vickers hardness (VHN) increases with increasing 211 content. Critical current density ({ital J}{sub {ital c}}) values obtained from magnetization measurements using a SQUID magnetometer were found to increase in melt- grown samples by the addition of 211 content. {copyright} {ital 1996 Materials Research Society.}
- OSTI ID:
- 389277
- Journal Information:
- Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 10 Vol. 11; ISSN JMREEE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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