Effect of magnetic and nonmagnetic nano metal oxides doping on the critical temperature of a YBCO superconductor

Salama, A. H.; El-Hofy, M.; Rammah, Y.S.; El-Khatib, Mostafa

doi:10.1088/2043-6262/6/4/045013

Cited by 9 publications

(13 citation statements)

References 31 publications

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“…Rietveld refinement showed that the addition of SnO 2 increases the percentage of Y-123 phase in the sample, hence reducing the percentage of Y-211 phase. Meanwhile, the insignificant changes in the lattice parameters a , b and c further support that there was no substitution of Sn in the sample, which is in good agreement with the results reported in [23]. Orthorhombicity of the Y-123 phase was calculated using the lattice parameter differences (a−b)/(a+b) and is tabulated in Table 1 [15].…”

Section: Resultssupporting

confidence: 83%

Structural and Superconducting Properties of Thermal Treatment-Synthesised Bulk YBa2Cu3O7−δ Superconductor: Effect of Addition of SnO2 Nanoparticles

et al. 2018

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YBa2Cu3O7−δ (Y-123) bulk superconductors with the addition of (0.0, 0.2, 0.4, 0.6, 0.8, and 1.0 wt.%) SnO2 nanoparticles were synthesised via a thermal treatment method. The influence of SnO2 addition on the superconducting properties by means of critical temperature, Tc, AC susceptibility, phase formation and microstructures, including its elemental composition analysis, were studied. Sharp superconducting transition, ∆Tc, and diamagnetic transition were obtained for all SnO2-added samples. It was observed that sample x = 0.4 with a Y-123 phase percentage of 95.8% gives the highest Tc, smallest ∆Tc, and the sharpest diamagnetic transition in the normalised susceptibility curves. The microstructure also showed an excess of Sn precipitates on the sample’s surface at x = 0.8 and above. As such, the best superconducting properties were observed at x = 0.4 SnO2 addition inside the Y-123 host sample.

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Section: Resultssupporting

confidence: 83%

Structural and Superconducting Properties of Thermal Treatment-Synthesised Bulk YBa2Cu3O7−δ Superconductor: Effect of Addition of SnO2 Nanoparticles

et al. 2018

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“…YBCO powder is prepared by the solid-state reaction formulation by mixing stoichiometric amounts of Y 2 O 3 , BaCO 3 , and CuO followed by grinding, calcinations, and sintering as previously described in details of our previous work (Salama et al 2015). A series of polycrystalline composite samples of YBCO+ x where x = 0.1, 0.2, 0.3, 0.4, and 0.5 wt.% of each metal oxide (Mn 3 O 4 , Co 3 O 4 , and Cr 2 O 3 ) were mixed separately and pressed into pellets.…”

Section: Doping Ybco With Nano-metal Oxidesmentioning

confidence: 99%

YBCO as a transition metal oxide ceramic material for energy storage

et al. 2019

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Background: Dielectric properties and ac conductivity were studied and correlated with the structure of a series of YBCO ceramic, doped with different doping levels ranging from 0.1 to 0.5 wt.% of magnetic nano-metal oxides, namely Mn 3 O 4 , Co 3 O 4 , and Cr 2 O 3. The most important feature of this study was the ultrahigh values of dielectric constants at a low frequency, exactly 50 Hz. We found that the undoped YBCO has a value of ε′ equal to 6.99 × 10 6 at 50 Hz at room temperature which was increased to 1.09 × 10 8 at 120°C, higher than any other ferroelectric material. Moreover, the value of ε′ depends on the nature and the value of the magnetic moment of the doped metal oxides. The value of ε′ is at least three orders of magnitude greater than any previously studied composites which suggest that this perovskite ceramic material can be used to create electrostatic capacitors with energy far better than the best electrode doublelayer capacitors (EDLC). Additionally, ac electrical conductivity has two frequency-dependent regions, the low frequency, where σ ac is independent of frequency, and the high-frequency region where dispersion occurs. The ac conductivity measurement with frequency leads us to conclude that the conduction mechanism in the studied samples can be correlated barrier hopping (CBH) model. Results: The dielectric properties of undoped YBCO ceramics at 50 Hz in temperature ranging from room temperature to 120°C were studied. It is obvious that the dielectric constant and dielectric loss of YBCO decrease with increase in frequency and temperature. It can be noticed that dielectric constant of YBCO increases at 50 Hz from 6.99 × 10 6 at room temperature to 1.09 × 10 8 at 120°C. The high values of ε′ recorded for YBCO doped with Mn 3 O 4 varied from 9.45 × 10 5 to 15.5 at room temperature and 1.34 × 10 5 to 9.242 at 1 MHz at 120°C. For doped YBCO with Co 3 O 4, the values of ε\ varied from 9.5 × 10 5 at 50 Hz to 13.24 at 1 MHz at room temperature, with changes from7.8 × 10 4 at 50 Hz to 53.42 at 1 MHz. For YBCO ceramic samples doped with Cr 2 O 3, ε′ varied from 1.138 × 10 6 at 50 Hz to 8.38 × 10 3 at 1 MHz at room temperature and from 5.935 × 10 5 at 50 Hz to 3.53 × 10 3 at 1 MHz at 120°C. The ac conductivity was further studied for undoped YBCO and doped YBCO with 0.1 wt.% of nano-metal oxide of Cr 2 O 3 , Co 3 O 4 , and Mn 3 O 4 samples. For all the studied samples, we found σ ac is typically specified to the hopping conduction and ac conductivity has a power law behavior in terms of frequency (ω). In general, there are two frequency-dependent regions for all the studied ceramic samples; in the low-frequency region, σ ac is independent of frequency whereas in the high-frequency region, dispersion occurs. The change in microwave conductivity of the studied samples with frequency (1-5 MHz) is shown in Fig. 5. It is observed that for all samples, the conductivity increases with temperatures and depends on the doped metal oxide. The values of σ ac at 5 MHz varied from − 0.4 to 1.2 for undoped YBC...

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“…YBCO powder is prepared by the solid state reaction route by mixing stochiometric amount of Y 2 O 3 , BaCO 3 , CuO followed by grinding, calcinations and sintering as previously described in details in our previous work [18].…”

Section: Doping Ybco With Nano Metal Oxidesmentioning

confidence: 99%

“…The pellets were sintered according to the same curve of heat treatment as in reference [18]. XRD was done for phase conformation and structural analysis using x-ray diffractograms provided with computer controlled formally made by the PHILIPS®MPDX´PERT x-ray diffratometer equipped with Cu radiation CuKα (λ=1.540 56 Å).…”

Section: Doping Ybco With Nano Metal Oxidesmentioning

confidence: 99%

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The influence of magnetic nano metal oxides doping on structure and electrical properties of YBCO superconductor

Salama

El-Hofy

Rammah

et al. 2016

Adv. Nat. Sci: Nanosci. Nanotechnol.

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Superconductor samples of YBa 2 Cu 3 O 7−δ (YBCO)+x where x=0.1, 0.2, 0.3, 0.4 and 0.5 wt% of nano metal oxides namely Cr 2 O 3 , Co 3 O 4 and Mn 3 O 4 namely are synthesized by the solid-state reaction route. Both x-ray diffraction and electron microscopy have been employed to study the phase identification and the microstructure of these samples. Transition temperature of the samples has been determined by four probe resistivity measurements. The x-ray diffraction patterns indicate that the gross structure of YBCO does not change with the substitution of three types of nano metal oxides with different doping level. The critical transition temperature (T c ) is found to decrease with the increases of doping level. Mn 3 O 4 has highest T c value which may be due to flux pinning from some defects and the rapid suppression in T c with increasing concentration of Mn 3 O 4 may be due to the cooper pair breaking and the hole filling in the CuO 2 planes.

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Effect of magnetic and nonmagnetic nano metal oxides doping on the critical temperature of a YBCO superconductor

Cited by 9 publications

References 31 publications

Structural and Superconducting Properties of Thermal Treatment-Synthesised Bulk YBa2Cu3O7−δ Superconductor: Effect of Addition of SnO2 Nanoparticles

Structural and Superconducting Properties of Thermal Treatment-Synthesised Bulk YBa2Cu3O7−δ Superconductor: Effect of Addition of SnO2 Nanoparticles

YBCO as a transition metal oxide ceramic material for energy storage

The influence of magnetic nano metal oxides doping on structure and electrical properties of YBCO superconductor

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