4.7 Article

Effects of TiO2 nanoparticle addition on the flux pinning properties of the Bi1.6Pb0.4Sr2Ca2Cu3O10+δ ceramics

期刊

CERAMICS INTERNATIONAL
卷 48, 期 14, 页码 20996-21004

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.04.093

关键词

BSCCO; TiO 2 nanoparticles; Flux pinning; Critical current density

资金

  1. Vietnam National Foundation for Science and Technology Development (NAFOSTED) [103.02-2020.02]
  2. Vingroup JSC
  3. Vingroup Innovation Foundation (VINIF), Institute of Big Data [VINIF.2021.TS.001]

向作者/读者索取更多资源

The effects of adding TiO2 nanoparticles on the flux pinning properties of the BPSCCO system were investigated. The addition of TiO2 decreased the volume fraction of Bi-2223 and degraded the texture structure of the samples. However, it enhanced the critical temperature and critical current density for certain doping levels.
The effects of adding TiO2 nanoparticles on the flux pinning properties of the Bi-Pb-Sr-Ca-Cu-O (BPSCCO) system were investigated. Polycrystalline samples of (Bi1.6Pb0.4Sr2Ca2Cu3O10+delta)1-x(TiO2)x, where x = 0.000, 0.002, 0.004, 0.006, 0.008, and 0.010, were fabricated by the conventional solid-state reaction method. The Xray diffraction (XRD) results showed that all samples consisted of Bi-2223 and Bi-2212 phases. The Bi-2223 volume fraction decreased with the addition of TiO2. Scanning electron microscopy (SEM) examination presented a degradation in texture structure with increasing misoriented grain and porosity with high doping contents. The critical temperature was decreased by TiO2 appearance in relation to Bi-2223 deceleration. Critical current density dependence on the magnetic field Jc(B) was enhanced with x = 0.002, 0.004 and reached maximal values on the x = 0.002 sample. In the collective pinning theory framework, the small bundle field (Bsb) and the large bundle field (Blb) were estimated, revealing the extension of the small and large bundle regimes with proper amounts of dopant. The temperature-dependent normalized critical current density (j) indicated that delta l pinning is the dominant flux pinning mechanism in all samples. The Dew-Hughes model analyzed the pinning center properties and confirmed that TiO2 nanoparticles create normal core point pinning centers in the matrix.

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