Please use this identifier to cite or link to this item: doi:10.22028/D291-24177
Title: Síntese de cerâmica supercondutora pelo processo de secagem com fluído supercrítico
Other Titles: Synthesis of superconductor ceramic by drying process supercritical fluid
Author(s): Carvalho, C.
Florentino, Ariovaldo O.
Rubo, E. A. A.
Dos Santos, Dayse Iara
Aegerter, Michel A.
Language: (Other)
Year of Publication: 1994
OPUS Source: 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 key words: Fluid
Kritische Temperatur
DDC notations: 500 Science
Publikation type: Conference Paper
Abstract: -
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 to this record: urn:nbn:de:bsz:291-scidok-23632
Date of registration: 7-Sep-2009
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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