Abstract
BiPb-2234 bulk samples with nominal composition of the compound Bi1.7Pb0.3−x Nd x Sr2Ca3Cu4O12+y (BSCCO) (0.025≤x≤0.10) have been prepared by the melt-quenching method. The effects of Nd substitution on the BSCCO system have been investigated by electrical resistance (R–T), scanning electron microscopy (SEM), X-ray diffraction (XRD) and magnetic hysteresis measurements. It has been the BSCCO (2212) low-T c phase is formed for all the substitution levels, together with the BSCCO (2223) high-T c phase. The results obtained suggest that with increasing Nd3+ doping for Pb2+ the (2223) phase existing in undoped BSCCO gradually transforms into the (2212) phase and hence all of the samples have a mixed phase formation. The R–T result of the samples show two-step resistance transition; first transition occurs at 100 K and second in an interval of 80–90 K, depending on the Nd concentration. We have found that the magnetization decreases with increasing temperature in agreement with the general characteristic of the high-T c materials. The samples exhibit weak field dependence particularly after 2 T and changes on the magnetic hysteresis, M–H curve rather small compared to the conventional superconducting materials. The maximum critical current density, J c, value was calculated to be 8.51×105 at 4.2 K and J c decreases with increasing temperature and the substitution level.
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Özkurt, B., Ekicibil, A., Ali Aksan, M. et al. Structural and Physical Properties of Nd Substituted Bismuth Cuprates Bi1.7 Pb0.3−x Nd x Sr2Ca3Cu4O12+y . J Low Temp Phys 149, 105–118 (2007). https://doi.org/10.1007/s10909-007-9500-0
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DOI: https://doi.org/10.1007/s10909-007-9500-0