Spark plasma sintering of Bi1:65Pb0:35Sr2Ca2Cu3O10+ : improving microstructural features for practical applications

Spark plasma sintering of Bi1:65Pb0:35Sr2Ca2Cu3O10+ : improving microstructural features for practical applications

García-Fornaris, I.; Calzada, I.; Govea-Alcaide, E.; Machado, I. F.; Jardim, R. F.

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The grain boundaries in polycrytalline high-Tc superconductors constitute a limitation for the use of these materials in several devices. In order to verify the effect of the consolidation process in the microstructural features, powders of single-phase Bi1:65Pb0:35Sr2Ca2Cu3O10+ (Bi-2223) were consolidate by the spark plasma sintering (SPS) method at 750 ◦C. The SPS samples exhibited very high density but are oxygen deficient, as inferred from the electrical resistivity, (T), data. The samples were then subjected to a post-annealing heat treatment in air, at 750 ◦C, and for different times, tpa = 0, 5, 30 min, and 40 hours. From the X-ray diffraction analysis we have found that SPS post-annealed samples for tpa Andgt; 5 min show the presence of an extra phase identified as the infinite layer compound with general formula Ca1−xSrxCuO2. Irrespective of the presence of this additional phase, the superconducting properties, including the superconducting critical current at 77 K, of the post-annealed SPS samples are optimized for tpa = 5 min. The combined properties of the samples obtained by the SPS technique make them suitable for practical applications as superconducting fault current limiters (SFCL).

The grain boundaries in polycrytalline high-Tc superconductors constitute a limitation for the use of these materials in several devices. In order to verify the effect of the consolidation process in the microstructural features, powders of single-phase Bi1:65Pb0:35Sr2Ca2Cu3O10+ (Bi-2223) were consolidate by the spark plasma sintering (SPS) method at 750 ◦C. The SPS samples exhibited very high density but are oxygen deficient, as inferred from the electrical resistivity, (T), data. The samples were then subjected to a post-annealing heat treatment in air, at 750 ◦C, and for different times, tpa = 0, 5, 30 min, and 40 hours. From the X-ray diffraction analysis we have found that SPS post-annealed samples for tpa Andgt; 5 min show the presence of an extra phase identified as the infinite layer compound with general formula Ca1−xSrxCuO2. Irrespective of the presence of this additional phase, the superconducting properties, including the superconducting critical current at 77 K, of the post-annealed SPS samples are optimized for tpa = 5 min. The combined properties of the samples obtained by the SPS technique make them suitable for practical applications as superconducting fault current limiters (SFCL).

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DOI: 10.5151/matsci-mmfgm-178-f

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Como citar:

García-Fornaris, I.; Calzada, I.; Govea-Alcaide, E.; Machado, I. F.; Jardim, R. F.; "Spark plasma sintering of Bi1:65Pb0:35Sr2Ca2Cu3O10+ : improving microstructural features for practical applications", p-82-85. In: Proceedings of the 13th International Symposium on Multiscale, Multifunctional and Functionally Graded Materials [=Blucher Material Science Proceedings, v.1, n.1]. São Paulo: Blucher, 2014.
ISSN 23589337, DOI 10.5151/matsci-mmfgm-178-f