Effects of Sb substitution on structural and superconducting properties of Bi in Bi1.75−xPb0.25SbxSr2Ca2Cu3Oy superconductor (original) (raw)
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Journal of Materials Science, 2007
The effect of the partial substitution of Ca by Sm in the Bi-2223 superconducting samples have been investigated in terms of X-ray diffraction (XRD), EDXRF (Energy Dispersive X-ray Fluorescent), magnetoresistivity, critical temperature, transport critical current density, and ac susceptibility measurements. The samples were prepared by the conventional solid-state reaction method. XRD patterns are used to calculate lattice parameters and phase ratio of the Bi-2223 samples. The volume fraction was determined from the intensities of Bi-2223 and Bi-2212 peaks. The room temperature XRD patterns of the samples showed the presence of Bi-2223 phase decreases with increasing the Sm content. We estimated the transition temperature of the samples from the resistivity versus temperature measurements in dc magnetic fields up to 0.6 T. We observed that transition temperature, T c , and transport critical current density, J trans c , depend on the Sm substitution. They both decrease with increasing the Sm substitution. We extracted the peak temperature, T p , and the pinning force density from our previous ac susceptibility measurements. The pinning force density decreased with increasing the Sm content. The possible reasons for the observed decreases in critical temperature and critical current density due to Sm substitution were discussed.
Journal of Superconductivity and Novel Magnetism, 2013
In this work we study the effect on structural and electrical properties of superconducting compound Bi 1.6 Pb 0.4 Sr 2 CaCu 2−y M y O 8+δ were M = Al (with y = 0-0.6). The samples were prepared by the solid-state reaction method. The samples have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), direct current (DC) resistivity versus temperature ρ(T) and alternative current (AC) susceptibility measurements. Structural analysis shows that the crystalline lattice structure of the prepared sample belongs, mainly, to the superconduc
One and multi-step solid state reaction methods were used to prepare a high temperature superconductor with a nominal composition Bi 2−x Li x Pb 0.3 Sr 2 Ca 2 Cu 3 O 10+δ for (0 ≤ x ≤ 0.5). The effect of preparation conditions and substituting Li on Bi sites had been investigated by the use of X-ray diffraction, resistance measurements and oxygen content to obtain the optimum conditions for formation and stabilization of the 2223-phase. It has been found that intermediate grinding will force to convert and accelerate the formation rate of the 2223-phase. The morphological analyses were carried out by SEM. The results showed that the multi-step technique was appropriate to prepare the composition Bi2−xLixPb0.3Sr2Ca2Cu3O10+δ. X-ray diffraction analysis showed two phases: high-T C phase 2223 and low-T C phase 2212 with orthorhombic structure for all samples. However, the optimum concentration was found for 0.3 which improved the microstructure and had the highest T C value 130 K for the highest value of oxygen content.
Physica C: Superconductivity, 1993
The effects produced by the annealing in nitrogen atmosphere at relatively low temperatures (400-500 °C) on the structural and superconducting properties of Bi2_xPb~r2Yo.2Cao.aCu2Oz have been investigated. The electrical properties of the examined samples (0.0 < x < 0.4), which are comparable when prepared in air, vary remarkably for similar nitrogen annealing, depending on the lead content of the phase. The disappearance of the superconducting transition (reversible for retreatments in air) was found for x=0 whereas no appreciable variation of Tc was evidenced for x=0.4, at least for the applied treatments; an intermediate behavior was observed for the x=0.2 sample. The structural changes and the local modulated structure were observed by high-resolution electron microscopy. The effect of lead substitution in stabilizing Tc is discussed. 0921-4534/93/$06.00@
Preparation of the 110 K high Tc superconductor Bi2Sr2Ca2Cu3Oy by Pb and Sb substitution
Physica C: Superconductivity, 1989
In the series Bi2Sr2Ca,_ ~ CunOy with n = 1, 2 and 3 the corresponding transition temperatures are 20, 85 and 110 K. The isolation of the 1 l0 K phase presents some problems. We have succeeded to establish a procedure, for the fabrication of a pure l l0 K phase by partial substitution of Bi with Pb and Sb, which has been characterized with X-ray diffraction, magnetization and electrical resistance measurements. A possible crystal structure is suggested similar to the Tl2Ba2Ca2Cu30v one.
This research involved the preparation of samples of Bi 2-(x+y) Pb x Ag y Sr 2 Ca 2 Cu 3 O 10+δ compounds and with different concentration of (x,y) which are (x=y=0) (x=0.05,y=0.15) (x=y=0.1) (x=0.15, y=0.05) by the method of solid state reaction under hydrostatic pressure of 8 ton/cm 2 temperature of annealing 850 k to know the range of effect of partial substitution on the synthetic and electric properties of compound. After undergoing the test of x-ray diffraction, it looked like the best substitution ratio of pb and Ag in Bi is when (x=0.05,y=0.15) where the values of lattice dimensions were a=b=5.4056 c=37.4226 A • and the crystalline composite is of tetragonal type this research also revealed that the oxygen has a vital role in increasing the critical temperature, we noticed by studying the electrical properties the critical temperature in this substitution Tc=143 k. Cite This Article: Khalid Hamdi Razzeg, Sabah M. Ali Ridha, and Chanar Abiden Zaynel, " Effect the Partial Substitution of (Pb, Ag) on Structural
Structural and Superconducting Properties of Bi1.7Pb0.3VxSr2Ca2Cu 2.7Ti0.3O10+δ. System
Superconductivity is a unique and powerful phenomenon of nature. it is a characterized by the disappearance of electrical resistance in various metals, alloys and compounds ). The effects c when they are cooled below a certain temperature (critical temperature, T bulk and δ 10+ O 0.3 Ti 2.7 Cu 2 Ca 2 Sr x V 0.3 Pb 1.7 of vanadium addition on the properties of Bi thin film samples for (0 ≤ x ≤ 0.4) were studied. The XRD analyses for all superconductor samples as bulk and thin films showed an orthorhombic structure with two superconducting phases . The critical temperature for the most films is less than t hat x V 0.3 Pb 1.7 of the bulk samples except for pure film. The surface morphology of bulk Bi and thin films before and after annealing obtained by AFM in 10+δ O 0.3 Ti 2.7 Cu 2 Ca 2 Sr three dimensions views. It was observed that the average roughness was higher at x= 0.2 (179.66nm) with a particle size of 219 nm
Modern Physics Letters B, 2005
0, 0.015, 0.03, 0.06, 0.09 and 0.12. Samples of series Bi 1.6 Pb 0.4 Sr 2 Ca 2 Cu 3-x Zn x O 10-δ with x = 0.0, 0.015, 0.03, 0.06, 0.09 and 0.12 are synthesized by solid-state reaction route. All the samples crystallize in tetragonal structure with majority (> 90%) of Bi-2223 (Bi 2 Sr 2 Ca 2 Cu 3 O 10 ) phase (c-lattice parameter ~ 36 A 0 ). The proportion of Bi-2223 phase decreases slightly with an increase in x. The lattice parameters a and c of main phase (Bi-2223) do not change significantly with increasing x. Superconducting critical transition temperature (T c ) decreases with x as evidenced by both resistivity [ρ(T)] and AC magnetic susceptibility [χ(T)] measurements. Interestingly the decrement of T c is not monotonic and the same saturates at around 96 K for x > 0.06. In fact T c decreases fast (~10K/at%) for x = 0.015 and 0.03 samples and later nearly saturates for higher x values. Present results of Zn doping in Bi-2223 system are compared with Zn doped other HTSC (High temperature superconducting) systems, namely the RE-123 (REBa 2 Cu 3 O 7 ) and La-214 ((La,Sr) 2 CuO 4 ).
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The syntheses of superconductor Bi 1.6 Pb 0.4 Sr 2 Ca 2-x M x Cu 3 O y with dopant M x (M = Mg, Na, and Ce with x = 0.15) with the sol-gel method was successfully made. The SEM JEOL-390 analysis of Bi 1.6 Pb 0.4 Sr 2 Ca 2-x M x Cu 3 O y dopant Mg is more homogeneous than Bi 1.6 Pb 0.4 Sr 2 Ca 2-x M x Cu 3 O y dopant Na and Ce which have more porosity. The effect dopants Mg and Ce for Bi 1.6 Pb 0.4 Sr 2 Ca 2-x M x Cu 3 O y produced the T c,onset 77K ; 72K. The Superconductor of Bi 1.6 Pb 0.4 Sr 2 Ca 2-x M x Cu 3 O y with dopant Na failed to achieve T c-zero (Zero resistance), only able to achieve resistance 3.77 x 10-2 Ohm at 69K. The Mapping of sample BPSCCO with dopant (M = Mg, Na, and Ce) the distribution of atoms in the elements is unevenly distributed.