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Titel: Síntese de cerâmica supercondutora pelo processo de secagem com fluído supercrítico
Sonstige Titel: Synthesis of superconductor ceramic by drying process supercritical fluid
Verfasser: Carvalho, C.
Florentino, Ariovaldo O.
Rubo, E. A. A.
Dos Santos, Dayse Iara
Aegerter, Michel A.
Sprache: Sonstige
Erscheinungsjahr: 1994
Quelle: Anais / 38° Congresso Brasileiro de Cerâmica; 2° Encontro de Mineradores e Consumidores : [18 a 21 de junho de 1994, Blumenau, SC] / Associação Brasileira de Cerâmica. - Vol. 2. - São Paulo, SP : Associação Brasileira de Cerâmica, 1994, S. 921-926
SWD-Schlagwörter: Fluid
Keramikpulver
Nitration
Kritische Temperatur
Rasterelektronenmikroskop
Röntgendiffraktometrie
Oxalate
DDC-Sachgruppe: 500 Naturwissenschaften
Dokumentart : InProceedings (Aufsatz / Paper einer Konferenz etc.)
Kurzfassung: -
In this work we prepared ceramic powders by a wet route using a mixture of nitrates and then dried in supercritical condition (CO2), in order to obtain the system Bi2Sr2Ca2Cu3Ox (BSCCO) with characteristic critical temperature of 110 K. The electrical and structural characterization of pellets fabricated using these powder has been done by measuring the electric resistance (four probe technique), critical transport current, scanning electronic microscopy (SEM), energy dispersive X-ray microanalysis (EDX) and x-ray diffractometry (XRD). The results are compared with these obtained for samples prepared by co-precipitation of oxalates. The analysis shows that exists an influence of the preparation method on the structure and the critical temperature. The time required for the material calcinations decreased drastically. Measurements of critical transport current show that the values obtained for both methods are comparable (50 A/cm2 at 4K).
Link zu diesem Datensatz: urn:nbn:de:bsz:291-scidok-23632
hdl:20.500.11880/24233
http://dx.doi.org/10.22028/D291-24177
SciDok-Publikation: 7-Sep-2009
Fakultät: Sonstige Einrichtungen
Fachrichtung: SE - INM Leibniz-Institut für Neue Materialien
Fakultät / Institution:INM
SE - Sonstige Einrichtungen

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