Effect of SiO 2 nano-particles and nano-wires on microstructure and pinning properties of YBa 2 Cu 3 O 7-d

Salem, M. K.; Almessiere, M.A.; Al–Otaibi, Amal L.; Salem, M. Ben; Azzouz, F. Ben

doi:10.1016/j.jallcom.2015.10.077

Cited by 33 publications

(8 citation statements)

References 34 publications

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“…Silica is widely studied by many researchers for applications in varieties of fields. Ben Salem, M, K. et al [12] found that nano-SiO 2 particles had an impact on the enhancement of the superconducting properties of YBa 2 Cu 3 O y . In lithium-ion batteries, nano-SiO 2 embedded SiO x matrix exhibited a stable discharge capacity with excellent cyclic stability and rate capability [13].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of breakdown strength of SrTiO3/nano-SiO2 composite film prepared by sol-gel technology

Yao

et al. 2017

Ceramics International

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Dielectric (1-x)SrTiO 3 /xSiO 2 (x=0, 0.01, 0.05 and 0.1) composite thin films were deposited onto Pt (100)/Ti/SiO 2 /Si substrates via sol-gel and spin coating technology and their surface morphology was examined by field emission scanning electron microscopy, indicating that surface morphology was apparently influenced by the nano-SiO 2 addition. A broad adsorption band at 3200-3500 cm-1 attributed to stretching vibrations of O-H bonds in the absorbed water was observed in fourier transform infrared spectroscopy (FTIR). The X-ray photoelectron spectroscopy (XPS) results show that nano-SiO 2 particles facilitate water absorption of STO thin films. The breakdown strength of SrTiO 3 /nano-SiO 2 composite films is increased to about 332 MV/m. At the same time, the leakage current of 0.9SrTiO 3 /0.1SiO 2 composite thin films decreases by two orders of magnitude under high electric field. Above results show that nano-SiO 2 particles facilitate water absorption of the thin films, making SrTiO 3 act as an effective solid state electrolyte for the anodic oxidation to achieve higher breakdown strength.

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Section: Introductionmentioning

confidence: 99%

Enhancement of breakdown strength of SrTiO3/nano-SiO2 composite film prepared by sol-gel technology

Yao

et al. 2017

Ceramics International

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“…Furthermore, the 500 cm −1 mode in Fig. 8(b), (d), and (f) exhibits hardening and a slight shift towards the higher frequencies for the pure and doped YBCO that began at T c , and it is preferentially associated with the apical oxygen displacements along the z-axis [7].…”

Section: Raman Scatteringmentioning

confidence: 89%

“…During the final processing stage, commercially pure silica nanoparticles (99.9 %, Aldrich) with the size of about 12 nm as shown in Fig. 1 [7] were added to the precursor powder YBCO by mixing and grinding both powders in an agate mortar. The additional amount of SiO 2 varied from x = 0, 0.01, and 0.1 wt.% of the total mass of the samples.…”

Section: Methodsmentioning

confidence: 99%

“…The simulation results have demonstrated an enhancement in the normal zone propagation velocity. Ben Salem et al [7] have synthesized a series of YBa 2 Cu 3 O y (YBCO, Y-123) samples with small amounts (0-1 wt%) of nanosized SiO 2 particles (30 nm) in air using a solid-state reaction route. They have computed the flux pinning force density (F p ) and investigated the possibility of the pinning mechanisms prevalent in type II superconductors.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of temperature dependence of Raman and photoluminescence analysis of YBa2Cu3O7 (YBCO) doped with SiO2 nanoparticles

Almessiere

2018

SCI SINTER

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We report the effect of SiO 2 nanoparticles (12 nm) in YBa 2 Cu 3 O 7 (YBCO) matrix. The samples YBCO and SiO 2 +YBCO are fabricated by a conventional solid-state reaction method, in ambiance conditions. We analyze these samples using X-ray diffraction (XRD), resonant Raman, environmental scanning electron microscopy (ESEM), and Photoluminescence (PL) as a function of temperature in the range from 77 to 837 K. The XRD confirm that the doped YBCO still displays a perovskite structure with the orthorhombic Pmmm phase. The Rietveld refinement confirms that SiO 2 nanoparticles induce not only a strong effect on the oxygen's O(5) and O(8) positions but also an elongation of the unit cell along the c-axis. The PL intensity of pure YBCO is more intense than the doped one that is mainly composed of two bands located at 2.4 eV and 1.88 eV. We simulate the PL intensity with temperature using the Bose-Einstein model with two activation energies corresponding to some specific vibration mode energies. The simulation reveals that the exchange energy between different levels in pure and doped YBCO is conducted by only two vibrations modes that are strongly linked to the oxygen and copper atoms in the YBCO matrix. We determine the evolution of Raman mode frequencies at 340 and 500 cm −1 with temperature using the Lorentzian function at q = 0 of the Balkanski model.

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“…It is known that these crystalline defects constitute the pinning center, which improves the J c [6,7]. Some investigations were also conducted in order to verify the doping effect on the oriented grain growth, the critical current density and the critical temperature T c in the Y123 polycrystalline samples [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Improvement on the melt-texturing performance of a (Y,Ta)0.5BaO3–YBa2Cu3Oy composite with superconductor applications

Bortolozo

Osório

Oliveira

et al. 2015

Ceramics International

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Effect of SiO 2 nano-particles and nano-wires on microstructure and pinning properties of YBa 2 Cu 3 O 7-d

Cited by 33 publications

References 34 publications

Enhancement of breakdown strength of SrTiO3/nano-SiO2 composite film prepared by sol-gel technology

Enhancement of breakdown strength of SrTiO3/nano-SiO2 composite film prepared by sol-gel technology

Investigation of temperature dependence of Raman and photoluminescence analysis of YBa2Cu3O7 (YBCO) doped with SiO2 nanoparticles

Improvement on the melt-texturing performance of a (Y,Ta)0.5BaO3–YBa2Cu3Oy composite with superconductor applications

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