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Luo, Ying; Wu, Yihang; Xiong, Xiang; Li, Q. Y.; Gawalek, W.; He, Zhi

doi:10.1023/a:1007872800961

Cited by 17 publications

(7 citation statements)

References 6 publications

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“…Further, the BZO particles arrange themselves on the surface of grains which leads to increase in inter-grain connectivity and porosity reduces significantly. Similar results were reported by Y. Y. Luo et al 35 It is important to mention that BZO fractions prevent the formation of continuous layer throughout the sample. The grains couple to each other up to certain content of BZO (up to 6%BZO) beyond that decoupling takes place (10%BZO) due to the porous nature of BZO.…”

Section: Resultssupporting

confidence: 90%

Optimization of BaZrO3 concentration as secondary phase in superconducting YBa2Cu3O7 for high current applications

Malik

2016

AIP Advances

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We report the superconducting state properties of YBa2Cu3O7 (YBCO) on introduction of BaZrO3 (BZO) as a secondary phase. YBCO+xBZO (x= 0, 2, 4, 6, and 10 wt%) composite samples were prepared by solid state reaction method and characterized for structural, morphological and superconducting properties. X-ray diffraction confirms the increased crystallinity and images of scanning electron microscopy measurement show an increase in both grain size and grain connectivity on addition of BZO in YBCO. These effects are well pronounced in an applied magnetic field. Critical current density, JC, as well as the pinning force peaks at 4% of BZO concentration showed significant difference. A three-fold enhancement in JC and a six-fold enhancement in pinning force were observed at this optimum BZO concentration. This has been attributed to the pinning of flux lines in YBCO due to introduction of BZO as a secondary phase. These results show that this composite has potential application in high current applications.

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Section: Resultssupporting

confidence: 90%

Optimization of BaZrO3 concentration as secondary phase in superconducting YBa2Cu3O7 for high current applications

Malik

2016

AIP Advances

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“…There are several applications of superconductors, such as in levitation, linear transportation systems, superconducting flywheels, superconducting motors and magnetic bearings, in which bulk materials are required instead of thin films. As compared to several reports on YBCO:BaZrO 3 superconducting nanocomposite thin films, there are only a few reports on the inclusion of BaZrO 3 in YBCO bulk superconductors [17][18][19]. Cloots et al [17] have shown that the addition of BaZrO 3 in melt textured YBCO modifies the distribution of YBaCuO 5 particles, and it is effective in reducing the size of YBaCuO 5 particles.…”

Section: Introductionmentioning

confidence: 99%

“…Cloots et al [17] have shown that the addition of BaZrO 3 in melt textured YBCO modifies the distribution of YBaCuO 5 particles, and it is effective in reducing the size of YBaCuO 5 particles. Luo et al [18] observed that ultrafine BaZrO 3 particles were pushed out and gathered in front of the growing fronts or between YBCO grains. Iida et al [19] have also investigated the microstructure and superconducting properties for melt-processed YBCO containing BaZrO 3 and YBa 2 ZrO 5.5 .…”

Section: Introductionmentioning

confidence: 99%

Investigation of flux pinning properties of YBCO:BaZrO3 composite superconductor from temperature dependent magnetization studies

Jha

Khare

2010

Journal of Magnetism and Magnetic Materials

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“…The average grain size increased to 2.71 µm and 0.50 µm for the 7.0 mol% BZO added SS and COP samples, respectively. The increasing grain size is probably due to dispersion of BZO nanoparticles between the grains of Y-123 which promoted grain growth [5,31]. According to Table 2, the powders obtained by the COP method have smaller size and narrower size range (0.30-0.50 µm) in comparison with that obtained via the SS method (1.24-2.71 µm).…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 97%

Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

et al. 2019

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Polycrystalline samples of YBa2Cu3O7−δ (Y-123) added with x mol% of BaZrO3 (BZO) nanoparticles (x = 0.0, 2.0, 5.0, and 7.0) were synthesized using co-precipitation (COP) and solid-state (SS) method. X-ray diffraction (XRD) patterns showed the formation of Y-123 and Y-211 as the major and minor phases, respectively. The samples prepared using COP method showed higher weight percentage of Y-123 phase (≤98%) compared to the SS samples (≤93%). A peak corresponding to BZO was also found in the samples added with BZO nanoparticles. The increasing intensity of the BZO peak as the BZO amount increased showed the increasing amount of the unreacted nanoparticles in the samples. Refinement of unit cell lattice parameters indicated that all the samples have an orthorhombic crystal structure and there is no orthorhombic-tetragonal phase transformation. As observed using scanning electron microscopy (SEM), all the samples showed randomly distributed grains with irregular shape. The average grain size for the pure sample prepared using COP method is smaller (0.30 µm) compared with that of the pure SS sample (1.24 µm). Addition of 7.0 mol% BZO led to an increase of average grain size to 0.50 μm and 2.71 μm for the COP and SS samples, respectively, indicating grain growth. AC susceptibility (ACS) measurement showed a decrease in the onset critical temperature, Tc-onset with BZO addition. Comparatively, Tc-onset for the COP samples is higher than that of the SS samples. The value of Josephson’s current, Io increased up to 2.0 mol% BZO addition, above which the Io decreased more drastically for the SS samples. The value of Io is 53.95 μA and 32.08 μA for the 2.0 mol% BZO added SS and COP samples, respectively. The decrease of Io is attributed to the distribution of BZO particles at the grain boundaries as also reflected in the drastic decrease of phase lock-in temperature, Tcj. As a result of smaller average grain size, the presence of more grain boundaries containing insulating BZO particles led to lower Io in the COP samples.

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Cited by 17 publications

References 6 publications

Optimization of BaZrO3 concentration as secondary phase in superconducting YBa2Cu3O7 for high current applications

Optimization of BaZrO3 concentration as secondary phase in superconducting YBa2Cu3O7 for high current applications

Investigation of flux pinning properties of YBCO:BaZrO3 composite superconductor from temperature dependent magnetization studies

Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

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