Abstract
We have produced the (BiPb)2V x Sr2Ca3Cu4−y Ti y O12+δ compounds by a melt-quenching method. For two different sintering times (185 and 192 hours), the effects of vanadium adding and Ti doping on the structure have been investigated by electrical resistance, scanning electron micrographs (SEM), XRD patterns and magnetic hysteresis loop measurements. It has been found that the high-T c superconducting phase, (2223), is formed in the samples annealed at 845 ○C for 185 and 192 h, with concentration x=0.2 and y=0.05. However, with increasing Ti doping the (2223) phase gradually transforms into the (2212) phase. The hysteresis loop areas decrease with increasing Ti concentration and sintering time. Our data have indicated that the critical current, J c , decreases with increasing magnetic field.
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Yazici, D., Ozcelik, B. Effect of high valency cations on the (BiPb)2Sr2Ca3Cu4O12+δ compounds. J Supercond Nov Magn 25, 293–297 (2012). https://doi.org/10.1007/s10948-011-1298-y
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DOI: https://doi.org/10.1007/s10948-011-1298-y