Synthesis and study of the ceramic high- superconductor (, 0.5, 0.7, 0.9 and 1)

Abou‐Aly, A. I.; Korayem, M T; Gomaa, N. G.; Awad, R.; Al-Hajji, M A

doi:10.1088/0953-2048/12/3/007

Cited by 24 publications

(12 citation statements)

References 26 publications

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“…From these results we can conclude that the decoupling temperature "T d " is less than 111 K. The overlapping of magnetoresistance curves at 111 K is due to the absence of flux trapped (above the knee), which hints that vortex pinning may be ineffective at elevated temperatures. These results are consistent with our previous results for (Hg, T1)-1223 [6], (T1, In)-1223 [7] and (Tl, In)-1212 [18] which showed that both driving currents and magnetic field are ineffective at the first stage of transition and enlarged the transition width in the second stage of transition. Also, these data could contain some information concerning the special distribution of the "strong" superconducting grains and "weak" superconducting boundaries.…”

Section: Fig (1)supporting

confidence: 93%

“…Generally, Tl-1223 phase was reported for the two compositions TlBa 2 Ca 2 Cu 3 O 9-δ [2] and (Tl 0.5 Pb 0.5 )Sr 2 Ca 2 Cu 3 O 9-δ [4]. The substitutions of Hg, Y [5,6] and In [7] into Tl-sites in the TlBa 2 Ca 2 Cu 3 O 9-δ were studied. They found that a small addition of Hg enhances the transition temperature from 122 K to 131 K whereas the addition of In reduces the transition temperature from 122 K to 100 K. Also, (Tl 0.5 Pb 0.5 ) Sr 2 Ca 2 Cu 3 O 9-δ can be improved by partial substitution of Ba +2 into Sr +2 sites and Tl by Pb and Bi [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Study of Electric Resistance and Magnetoresistance for Agx(Tl0.8Pb0.1Bi0.1)Ba2Ca2Cu3O9-δ Superconductors

2001

Egyptian Journal of Solids

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Superconducting samples of the type Ag x (Tl 0.8 Pb 0.1 Bi 0.1) Ba 2 Ca 2 O 9-δ with (0< x < 0.4) are prepared from the high purity oxides Tl 2 O 3 , PbO, Bi 2 O 3 , BaO 2 , CaO, CuO, and Ag metal at 870 o C for 4h. The characterization, electric resistance and magnetoresistance for the prepared samples are performed. Ag addition to (Tl 0.8 Pb 0.1 Bi 0.1)Ba 2 Ca 2 Cu 3 O 9-δ shows a reduction in both lattice parameters "a" and "c" while the grain size is improved till about x=0.2. Resistance data show that the superconducting critical temperature "T c " has little variation with increasing silver addition. Oxygen annealing of these samples causes an improvement in zero resistance temperature "T 0 ". The excess conductivity studies show that there are three-dimension fluctuations (3D) in the mean field region for either pure sample or samples containing Ag. As the silver addition increases the transverse magentoresistance decreases till x=0.2 and then increases. Transverse magnetoresistance vs. applied magnetic field at different temperatures shows a decrease as the temperature reaches the superconducting critical temperature. The driving current has an effect in the value of magnetoresistance near the zero resistance temperature but it does not affect the value of the magnetoresistance near the superconducting critical temperature.

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Section: Fig (1)supporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Study of Electric Resistance and Magnetoresistance for Agx(Tl0.8Pb0.1Bi0.1)Ba2Ca2Cu3O9-δ Superconductors

2001

Egyptian Journal of Solids

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“…Consequently, an amount of flux is trapped. As a result, the strength of the vortex pinning is weakened and the specimen is in a more resistive state [25]. The second one is that T decreases as the Sc content increases until x = 0.05 and then it increases.…”

Section: Resultsmentioning

confidence: 98%

Magnetoresistance studies of Tl-1212 phase substituted by scandium

Mohammed¹,

Abou‐Aly²,

Awad³

et al. 2006

Supercond. Sci. Technol.

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Superconducting samples of TlBa 2 CaCu 2−x Sc x O 7−δ with x = 0.0, 0.025, 0.05, 0.1, 0.15 and 0.2 have been prepared via the solid-state reaction technique. The effect of weak magnetic fields up to 4.4 kG on the electrical resistivity of the prepared samples has been studied to investigate the flux motion for this phase. The results reveal a slight shift in the superconducting transition temperature T c and an increase in the superconducting transition width T with increasing magnetic field. The magnetic field has a small effect on the electrical resistivity in the normal state and in the first stage of transition, whereas the change in the second stage of superconducting transition is very large. The experimental data, in the second stage of superconducting transition, fit well with the thermally activated flux creep model and the activation energy U (B) shows a power law dependence on magnetic field as B −β . Also, the transition width is related to the magnetic field according to the relation T α B n . The values of β and n are strongly dependent on the scandium content. The magnetic field and temperature dependence of the activation energy U (B, T ) is found to be U (B, T ) ∼ T B −η , where η = β + n. The critical current density J c (0) and the upper critical field B c2 (0) are calculated, from the above measurements, as a function of scandium content. Finally, the electronic thermal conductivity κ e , estimated from the Wiedermann-Franz law, is reported at different applied magnetic fields for the prepared samples.

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“…Arrhenius law can be used to determine the activation energy of a superconductor in the low resistance region. According to the Equation () derived from the Equation (), the activation energy in the various applied magnetic fields can be computed from the slope of the linear part in the expanding tails of the Arrhenius plots: 24

ρ (T, H) = ρ_{0} \exp (‐ U_{0} true/ k_{B} T),

U_{0} = ‐ k_{B} T \ln (\frac{ρ}{ρ_{0}}),

where ρ ( T , H ) is the resistivity value of the samples at temperature T and magnetic field H , ρ 0 is the pre‐exponential factor independent of the field, k B is the Boltzmann constant and U 0 is the activation energy. The ln ( ρ / ρ 120 K ) − 1/ T Arrhenius graphs obtained from Figure 2 are shown in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

Research of both γ‐irradiation and La₂O₃ addition on structural and magnetoresistivity of Bi‐2223 bulk superconductors

Ağıl

Ozoglu

2021

Int J Applied Ceramic Tech

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Since Bi-based superconductors were discovered by Maeda et al. 1 interest in large-scale technical applications and scientific research has increased significantly. BiSrCaCuO (BSCCO) high-temperature superconductor contains three phases with the general formula Bi 2 Sr 2 Ca n−1 Cu n O 2n+4+δ .Here n = 1 (Bi-2201), 2 (Bi-2212), and 3 (Bi-2223) represent the number of CuO 2 layers and have critical temperatures of 20, 85, and 110 K, respectively. 1,2 Bi-2223 compound is preferred over others because of its high critical temperature (T c ). Researchers have made great efforts to improve the key properties of this compound, such as its transition temperature, magnetic field carrying capacity, and high critical current density. 3 The biggest obstacle to the use of this compound in applications is weak intergranular bonds and poor flux pinning ability. Different methods such as adding impurity phases, 4-6 ion irradiation column defects, 7,8 point defects caused by oxygen deficiency, 9 to prevent hysteresis chemical substitution or magnetic nanoparticle addition, 10-13 etc. in order to increase the pinning characteristic of Bi-2223. It is a well-known method to create defects with various irradiations in the material to improve the superconducting properties of Bi-2223. These particles disrupt the crystal lattice of the material and create effective pinning centers that increase the critical current density of the Bi-2223 superconductor. [14][15][16][17][18][19] In a study reported by Zhao et al. 15 it was observed that the zero resistance temperatures (T zero c ) of Bi-based bulk superconducting materials exposed to gamma irradiation at certain intensities and durations first increased slightly and then gradually decreased. The authors stated that there are two reasons for this behavior to occur with gamma irradiation. The first one is the increase in the T zero c as a result of the energy gap becoming higher than normal state by linking the excited electrons and holes to the superconducting carriers. Then, the reason for the decrease in T zero c is

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Synthesis and study of the ceramic high- superconductor (, 0.5, 0.7, 0.9 and 1)

Cited by 24 publications

References 26 publications

Study of Electric Resistance and Magnetoresistance for Agx(Tl0.8Pb0.1Bi0.1)Ba2Ca2Cu3O9-δ Superconductors

Study of Electric Resistance and Magnetoresistance for Agx(Tl0.8Pb0.1Bi0.1)Ba2Ca2Cu3O9-δ Superconductors

Magnetoresistance studies of Tl-1212 phase substituted by scandium

Research of both γ‐irradiation and La₂O₃ addition on structural and magnetoresistivity of Bi‐2223 bulk superconductors

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Synthesis and study of the ceramic high- superconductor (, 0.5, 0.7, 0.9 and 1)

Cited by 24 publications

References 26 publications

Study of Electric Resistance and Magnetoresistance for Agx(Tl0.8Pb0.1Bi0.1)Ba2Ca2Cu3O9-δ Superconductors

Study of Electric Resistance and Magnetoresistance for Agx(Tl0.8Pb0.1Bi0.1)Ba2Ca2Cu3O9-δ Superconductors

Magnetoresistance studies of Tl-1212 phase substituted by scandium

Research of both γ‐irradiation and La2O3 addition on structural and magnetoresistivity of Bi‐2223 bulk superconductors

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Research of both γ‐irradiation and La₂O₃ addition on structural and magnetoresistivity of Bi‐2223 bulk superconductors