Effect of Nb addition on the critical parameters of BSCCO superconductor

Sozeri, H.
Ghazanfari, N.
Oezkan, H.
Kılıç, Adnan
Hasanlı, Nızamı
Pure and Nb2O5 added Bi1.6Pb0.4NbxSr2Ca2Cu3O delta superconductors (0 <= x <= 0.30) were synthesized by the ammonium nitrate melt route. Fraction of the high T-c 2223 phase increases with addition of small amounts of Nb. AC susceptibility and transport measurements showed the optimum Nb concentration as x = 0.10. Nb additions above x = 0.20 decrease significantly the fraction of the high-T-c phase and degrade the superconducting properties.


Effect of calcium carbonate addition on carbothermic formation of hexagonal boron nitride
ÇAMURLU, HASAN ERDEM; SEVİNÇ, NACİ; Topkaya, Yavuz Ali (Elsevier BV, 2008-01-01)
Effect of CaCO3 on formation of hexagonal boron nitride (h-BN) was investigated by holding CaCO3 free and CaCO3 added activated carbon-boric oxide mixtures under nitrogen atmosphere at 1500 degrees C for 30-120 min. Amount of CaCO3 addition was varied in the range of 0-50 wt.% of the initial mixture. Products were characterized by powder X-ray diffractometry, FT-IR analysis, quantitative chemical analysis, scanning electron microscopy and BET specific surface area analysis. It was observed that calcium carb...
Sen, F. G.; Kinaci, A.; Aydınol, Mehmet Kadri (2007-09-28)
FeTi can store 3.7 wt% hydrogen if it is synthesized in the form of FeTiH4. In the present study, candidate alloying elements were investigated that would decrease the formation energy of this hydride, using first principles calculations within the generalized gradient approximation (GGA) to density functional theory (DFT). Selected alloying elements are Co, Mg, Mo, Ni, Nb, V and Zr, and they were substituted for Fe or Ti atoms separately. Their effects on the formation energy of FeTiH4 were analyzed on the...
Effect of sodium carbonate on carbothermic formation of hexagonal boron nitride
Akyıldız, Uğur; Sevinç, Naci; Department of Metallurgical and Materials Engineering (2010)
Effect of Na2CO3 on formation of hexagonal boron nitride (h-BN) by carbothermic method has been studied by subjecting B2O3-C and Na2CO3-added B2O3-C mixtures to N2 (g) atmosphere. Na2CO3 amount in the mixtures was changed in the range of 0-40 wt. %. Time and temperature were used as experimental variables. Reaction products were analyzed by XRD and scanning electron microscope. Na2CO3 was found to increase both the amount and the particle size of h-BN similar to CaCO3 [1]. Na2CO3 was found to be less effect...
Effect of an anionic surfactant on different type of hydrate structures
Karaaslan, U; Uluneye, E; Parlaktuna, Mahmut (2002-07-01)
In this study, methane and gas mixture (including 88.17% propane) hydrates were produced from the anionic surfactant solutions of 0.00, 0.01 and 0.05 wt.% to investigate the effect of surfactant on the hydrate formation rate. Hydrate formation rate increases (promotion effect) with surfactant concentration, but the extent of the surfactant effect is closely related with the type of hydrate structure. The increase in the hydrate formation rate of sII type structure is relatively small compared to that obtain...
Effect of N-methylimidazole and 3,5-dimethylpyrazole ligands on the polymerization of di(2,6-dichlorophenolato) Cu(II)/Co(II) complexes in the solid state
Baştürkmen, M.; Hacaloğlu, Jale; Kisakürek, D. (2004-03-15)
The polymerization of 2,6-dichlorophenol (DCPH) was achieved through the thermal decomposition of copper complexes of DCPH with N-methylimidazole (NMIz) and 3,5-dimethylpyrazole (DMPz) ligands. Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), mass spectrometry, ultraviolet-visible spectroscopy, diffuse reflectance spectroscopy, magnetic susceptibility balance, electron spin resonance, X-ray analysis, and elemental analysis were used to characterize the complexes. The polymerizatio...
Citation Formats
H. Sozeri, N. Ghazanfari, H. Oezkan, A. Kılıç, and N. Hasanlı, “Effect of Nb addition on the critical parameters of BSCCO superconductor,” 2007, vol. 929, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/39947.