Enhancements of Critical Temperature in Bi-Pb-Sr-Ca-Cu-O Superconductors
tr. 17-24
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2017
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oai:112.137.131.14:VNU_123-605482017-12-05T20:02:31Z Enhancements of Critical Temperature in Bi-Pb-Sr-Ca-Cu-O Superconductors Tran, Hai Duc Duong, Thi Thanh Nhan Le, Minh Tien Nguyen, Khac Man BPSCCO Bi-2223 Bi-2212 T c,0 RRR tr. 17-24 In this work, the effects of sintering temperature and Na subtitution on zero critical temperature (Tc,0) in Bi-Pb-Sr-Ca-Cu-O superconductors were investigated. The Bi1.6Pb0.4Sr2Ca2-xNaxCu3O10+d bulk samples with x = 0.00 and 0.05 (BPSCCO) were prepared by using the solid state reaction technique at elevated sintering temperatures of 840 and 850oC. To examine the improvements of structural and superconducting properties of the BPSCCO samples, the X-ray diffraction (XRD), scanning electronic microscope (SEM) and DC resistance versus temperature (R-T) measurements were carried out. The experimental findings exhibit a co-existence of the high Tc (Bi-2223) and low Tc (Bi-2212) phases in all samples. The estimated volume fraction of the Bi-2223 phase was increased from 71.4 to 75.7%, and the average size of the Bi-2223 grains was enlarged from 4.5 to 9.8 mm as changing the sample preparation conditions. The improved connectivities between the Bi-2223 grains were also obtained by quantitively analyzing the relation between Tc,0 and residual resistance ratio (RRR). These improvements were likely to be reasons for the enhancements of Tc,0 in the BPSCCO samples. 2017-12-05T03:34:52Z 2017-12-05T03:34:52Z 2017 Article 2588-1124 http://repository.vnu.edu.vn/handle/VNU_123/60548 other Tập 33;Số 3 application/pdf ĐHQGHN |
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Vietnam National University, Hanoi |
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BPSCCO Bi-2223 Bi-2212 T c,0 RRR |
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BPSCCO Bi-2223 Bi-2212 T c,0 RRR Tran, Hai Duc Duong, Thi Thanh Nhan Le, Minh Tien Nguyen, Khac Man Enhancements of Critical Temperature in Bi-Pb-Sr-Ca-Cu-O Superconductors |
| description |
tr. 17-24 |
| format |
Article |
| author |
Tran, Hai Duc Duong, Thi Thanh Nhan Le, Minh Tien Nguyen, Khac Man |
| author_facet |
Tran, Hai Duc Duong, Thi Thanh Nhan Le, Minh Tien Nguyen, Khac Man |
| author_sort |
Tran, Hai Duc |
| title |
Enhancements of Critical Temperature in Bi-Pb-Sr-Ca-Cu-O Superconductors |
| title_short |
Enhancements of Critical Temperature in Bi-Pb-Sr-Ca-Cu-O Superconductors |
| title_full |
Enhancements of Critical Temperature in Bi-Pb-Sr-Ca-Cu-O Superconductors |
| title_fullStr |
Enhancements of Critical Temperature in Bi-Pb-Sr-Ca-Cu-O Superconductors |
| title_full_unstemmed |
Enhancements of Critical Temperature in Bi-Pb-Sr-Ca-Cu-O Superconductors |
| title_sort |
enhancements of critical temperature in bi-pb-sr-ca-cu-o superconductors |
| publisher |
ĐHQGHN |
| publishDate |
2017 |
| url |
http://repository.vnu.edu.vn/handle/VNU_123/60548 |
| _version_ |
1680964738039676928 |