Influences of BaZrO3 particles on the microstructure and flux pinning of YBCO film prepared by using modified TFA-MOD approach

Jin, Lihua; Zhang, S.N.; Yu, Z.M.; Li, C.S.; Feng, Jianqing; Sulpice, A.; Wang, Y.; Zhang, P.X.

doi:10.1016/j.matchemphys.2014.10.005

Cited by 13 publications

(3 citation statements)

References 28 publications

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“…In this regard, addition of chemical dopants is one of the most straight forward strategies. It was shown that the addition of BaZrO 3 (BZO) nanoparticles into Y-123 improved J c without affecting much the T c value [4,5]. This is because BZO did not dope into the structure of Y-123.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…Conducting and semiconducting nanomaterial impurities introduced into the Y-123 system were found to enhance its transport properties. These impurities are expected to act as pinning centres and/or reduce the impact of the weak link of the grain boundaries [11,12,13,14,15]. For instance, conductive materials of carbon nanotubes (CNTs) added to Y-123 synthesized using a co-precipitation process acted as pinning centres and resulted in an increase of J c from 11 A/cm 2 for x = 0.0 to 477 A/cm 2 for the sample with x = 0.2 wt.% [14].…”

Section: Introductionmentioning

confidence: 99%

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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“…BaZrO 3 (BZO) nanoparticles as a kind of artificial pinning centres have been successfully introduced into REBCO films by MOD methods, including TFA-MOD [13][14][15] and FF-MOD [16][17][18][19]. Although most of these research studies proved the improvement of J c -B properties by the formation of uniformly dispersed BZO nanoparticles, the optimal BZO doping level is very different for these methods [16,17,[20][21][22]. Moreover, it was reported that texture and microstructure of YBCO films were deteriorated by BZO doping [19].…”

Section: Introductionmentioning

confidence: 99%

Influence of chemical doping on flux pinning of GdBa₂Cu₃O_7−z films

Liu

Wang

Huo

et al. 2018

Surface Engineering

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Epitaxial GdBCO films with Cobalt (Co) and BaZrO 3 (BZO) doping were prepared on (00l) LaAlO 3 substrate by a self-developed fluorine-free polymer-assisted metal-organic deposition (FF-PA-MOD) approach. The effect of different doping ways on structure and properties of GdBCO films was investigated. Our results show that in-field critical current density (J c ) values of doped films have been distinctly improved compared to the pure film. It is noted that Co-doped film has much larger in-field J c values than BZO-doped film, especially at higher temperatures. Furthermore, Co-doped GdBCO film shows significantly enhanced surface smoothness and grain connectivity. It is suggested that obviously enhanced J c -B properties of the film may be attributed to improved surface morphologies and effective flux pinning centres by dilute Co doping. This study may offer another simple and efficient way to obtain the GdBCO-based coated conductors with high current densities.

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Influences of BaZrO3 particles on the microstructure and flux pinning of YBCO film prepared by using modified TFA-MOD approach

Cited by 13 publications

References 28 publications

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

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

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

Influence of chemical doping on flux pinning of GdBa₂Cu₃O_7−z films

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Influences of BaZrO3 particles on the microstructure and flux pinning of YBCO film prepared by using modified TFA-MOD approach

Cited by 13 publications

References 28 publications

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

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

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

Influence of chemical doping on flux pinning of GdBa2Cu3O7−z films

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Influence of chemical doping on flux pinning of GdBa₂Cu₃O_7−z films