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Experimental studies of yttrium barium(2)(copper(1-x)iron(x))(3)oxygen(7+delta) and bismuth(2)strontium(2)calcium(n-1)copper(n)oxygen(2n+4) high T(c) superconductors

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Date Issued:
1990
Summary:
Fe-substituted Y123 and Bi-based high Tc superconducting samples were prepared and studied. Magnetic susceptibility measurements, x-ray diffraction and Scanning Electron Microscopy were used to study the transition temperature Tc, preferential grain orientation and phase formation of the compounds. Tc was found to decrease more rapidly with Fe concentrations above 2.5%. Thermally reducing the oxygen content shows that Fe clusters form at high Fe concentrations. Magnetic susceptibility and x-ray diffraction measurements show that only the 80 K phase is present in Bi4Sr3Ca3Cu6Ox samples. For Bi0.7Pb0.3SrCaCu1.8Ox and Bi1.8Pb0.2Sr2Ca2Cu3Ox samples, the 110 K phase becomes dominant after sintering for 126 hours and 48 hours respectively. Preferential grain orientation was also observed in these materials.
Title: Experimental studies of yttrium barium(2)(copper(1-x)iron(x))(3)oxygen(7+delta) and bismuth(2)strontium(2)calcium(n-1)copper(n)oxygen(2n+4) high T(c) superconductors.
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Name(s): Lu, Huizong
Florida Atlantic University, Degree Grantor
Medina, Fernando D., Thesis Advisor
Type of Resource: text
Genre: Electronic Thesis Or Dissertation
Issuance: monographic
Date Issued: 1990
Publisher: Florida Atlantic University
Place of Publication: Boca Raton, Fla.
Physical Form: application/pdf
Extent: 124 p.
Language(s): English
Summary: Fe-substituted Y123 and Bi-based high Tc superconducting samples were prepared and studied. Magnetic susceptibility measurements, x-ray diffraction and Scanning Electron Microscopy were used to study the transition temperature Tc, preferential grain orientation and phase formation of the compounds. Tc was found to decrease more rapidly with Fe concentrations above 2.5%. Thermally reducing the oxygen content shows that Fe clusters form at high Fe concentrations. Magnetic susceptibility and x-ray diffraction measurements show that only the 80 K phase is present in Bi4Sr3Ca3Cu6Ox samples. For Bi0.7Pb0.3SrCaCu1.8Ox and Bi1.8Pb0.2Sr2Ca2Cu3Ox samples, the 110 K phase becomes dominant after sintering for 126 hours and 48 hours respectively. Preferential grain orientation was also observed in these materials.
Identifier: 14643 (digitool), FADT14643 (IID), fau:11436 (fedora)
Note(s): Thesis (M.S.)--Florida Atlantic University, 1990.
Subject(s): High temperature superconductivity
High temperature superconductors
Held by: Florida Atlantic University Libraries
Persistent Link to This Record: http://purl.flvc.org/fcla/dt/14643
Sublocation: Digital Library
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Host Institution: FAU
Is Part of Series: Florida Atlantic University Digital Library Collections.