A glass-ceramic Bi 1.7 V 0.3 Sr 2 Ca 2 Cu 3 O x superconductor was prepared by the melt-quenching method. The compound was characterized by scanning electron microscopy, x-ray diffraction, differential thermal analysis, current-voltage characteristics, transport resistance measurements, and Hall effect measurements. Two main phases (BSCCO 2212 and 2223) were observed in the x-ray data and the values of the lattice parameters quite agree with the known values for 2212 and 2223 phases. The glass transition temperature was found to be 426 °C while the activation energy for crystallization of glass has been found to be E a = 370.5 kJ / mol. This result indicates that the substitution of vanadium increased the activation energy for the BSCCO system. An offset T c of 80 K was measured and the onset T c was 100 K. The Hall resistivity ρ H was found to be almost fieldindependent at the normal state. A negative Hall coefficient was observed and no sign reversal of ρ H or R H could be noticed. The mobility and carrier density at different temperatures in the range 140-300 K under different applied magnetic fields up to 1.4 T were also measured and the results are discussed.
Glass-Ceramic Superconductor. -The title compound is prepared by melting a mixture of Bi2O3, SrCO3, CaCO3, CuO, and V2O5 in air (1150°C, 90 min). The samples are characterized by SEM, XRD, DTA, current-voltage characteristics, and Hall effect measurements. Beside changing the phase, partial substitution of vanadium for Bi in Bi 2 Sr 2 Ca 2 Cu 3 O x to form the title compound has also different effects on the physical, electrical, and magnetic properties of the compound. -(KAYED*, T. S.; CALINLI, N.; AKSU, E.; KORALAY, H.; GUENEN, A.; ERCAN, I.; AKTUERK, S.; CAVDAR, S.; Cryst.
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