Browsing by Author "HU, YH"

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FORMATION AND CHARACTERIZATION OF A SUPERCONDUCTING POLYMER COMPOSITE
(1992-04-01)
CHEN, TM
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HU, YH
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交大名義發表
;
應用化學系
;
National Chiao Tung University
A series of ceramic superconductor/polymer composites showing good magnetic levitation and mechanical flexibility have been prepared by dispersing Bi2-xPbxSr2Ca2Cu3Oy powder in an acrylonitrile-butadiene-styrene (ABS) rubber matrix, followed by hot or cold pressing and curing. Typically, the resistivities of the as-prepared flexible superconducting (in a magnetic sense) tapes or discs of the composite do not reach zero; however, the magnetic flux exclusion is maintained in the temperature range T < T(c) (105 K). The composites showed a large diamagnetic susceptibility that increased with increasing volume fraction of superconductor filler as indicated by magnetization measurements. The electrical and magnetic properties and microstructure of these composites are presented and their implications for future work are discussed.
POLYMERIC PRECURSOR DERIVED HIGH-TC BISMUTH SUPERCONDUCTORS
(1991-12-01)
CHEN, TM
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HU, YH
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交大名義發表
;
應用化學系
;
National Chiao Tung University
Two bismuth-based high-T(c) oxide superconductors have been prepared by employing the polymeric citric acid/ethylene glycol (CA/EG) precursors, The polymeric precursors of mixed cations can be converted into X-ray pure Bi2Sr2CaCu2Ox (2212) and Bi1.5Pb0.5Sr2Ca2Cu3Oy (2223) phases with T(c)(zero)s in the range of 76 K and 100-110 K, respectively, and with good stoichiometry control and sample homogeneity. We describe the chemistry involved in the materials processing leading to the formation of bismuth-based superconductors and report the results from materials characterization by differential thermal analysis, resistivity and magnetization measurements.
POLYMERIC PRECURSORS FOR THE PREPARATION OF BI1.5PB0.5SR2CA2CU3OX
(1992-03-01)
CHEN, TM
;
HU, YH
;
交大名義發表
;
應用化學系
;
National Chiao Tung University
PREPARATION AND CHARACTERIZATION OF SOME SUPERCONDUCTOR POLYMER COMPOSITES
(1991-12-01)
CHEN, TM
;
HU, YH
;
交大名義發表
;
應用化學系
;
National Chiao Tung University
A technique for preparing flexible composites by dispersing high-T(c) bismuth-based superconductor filler in an ABS rubber matrix with transition temperature above 100K (based on magnetization measurements) has been developed. Superconducting tapes or discs of the Bi1.5Pb0.5Sr2Ca2Cu3Ox/ABS composites with flexibility was formed by wet or dry blending. Data obtained from dc resistivity and magnetization measurements on the composites and the features of microstructure are presented.