Abstract
The structural and magnetic properties evolution of Cr-doped Bi2Sr2CaCu2−xCrxOy ceramics (x = 0.0, 0.05, 0.1, and 0.25) have been investigated using XRD, SEM, DC resistivity and M–H measurements. X-ray diffraction studies have shown that all samples are mainly composed of Bi-2212 phase, indicating that Cr can be incorporated in its crystal structure. The microstructure of the highly Cr-doped samples showed that some impurity phases appear, decreasing the conductivity between the grains. T c (onset) and T c (offset) have been improved for x = 0.05 Cr doping, while 0.25 Cr doped samples are not superconducting. This behavior can be associated to changes in the hole concentration and/or the magnetic nature of Cr. The magnetic properties indicate that low Cr-doping enhances the loop widths. Additionally, the critical current densities, J c , of samples have been calculated by using the Bean’s critical state model. It has been found that there are important improvements in J c values between 0.2 and 0.9 T applied magnetic fields for 0.05 Cr doped samples.
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Acknowledgements
This work is supported by the BAP Research Fund of Mersin University, Mersin, Turkey, under Grant Contract No: 2017-1-TP3-2176. A. Sotelo, M. A. Madre, and J. C. Diez thank Gobierno de Aragón-FEDER (Grupos de Investigacion Consolidados T12 and T87), and MINECO-FEDER (MAT2013-46505-C3-1-R) for financial support. The use of Servicio General de Apoyo a la Investigación-SAI (Universidad de Zaragoza), MEİTAM Central Laboratory (Mersin University), and METU Central Laboratory (Middle East Technical University, Ankara) are also acknowledged.
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Gün, E., Özkurt, B., Özçelik, B. et al. Physical, electrical and magnetic properties of Cr doped Bi2Sr2Ca1Cu2−xCrxOy (Bi-2212) superconductors prepared by laser floating zone technique. J Mater Sci: Mater Electron 28, 13120–13125 (2017). https://doi.org/10.1007/s10854-017-7145-6
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DOI: https://doi.org/10.1007/s10854-017-7145-6