Bi2Sr2CaCu2Ox bulk superconductor with MgO particles embedded

Christova, K.; Manov, A.; Nyhus, J.; Thisted, U.; Herstad, O.; Foss, Sean Erik; Haugen, K.N.; Fossheim, K.

doi:10.1016/s0925-8388(01)02021-7

Cited by 32 publications

(10 citation statements)

References 11 publications

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“…A prominent improvement in superconducting properties of Bi-based superconductor was observed after inclusion of MgO, ZrO 2 and Al 2 O 3 nanoparticles [9][10][11] . Increase in superconducting volume fraction and sharpness in transition width of Bi-2212 superconducting phase was observed after inclusion of MgO nanoparticles [12] . The critical current density, volume pinning force density, activation energy and onset temperature in presence of applied magnetic field were improved after alumina nanoparticles inclusion in (Bi, Pb)-2223 superconductor [13] .…”

Section: Introductionmentioning

confidence: 95%

Superconducting Properties of (MnFe2O4)x/CuTl-1223 Composites

Mumtaz¹

2017

JNMS

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The effects of nanometer size MnFe 2 O 4 particles addition on different properties of (Cu 0.5 Tl 0.5 ) Ba 2 Ca 2 Cu 3 O 10−δ (CuTl-1223) superconducting phase was studied. MnFe 2 O 4 nanoparticles were synthesized by sol-gel method and were added to CuTl-1223 superconducting phase synthesized by solid-state reaction to get (MnFe 2 O 4 ) x / CuTl-1223; x = 0 ~ 2.0 wt. % composites. The effects of these magnetic nanoparticles on structural, morphological and superconducting transport properties of host CuTl-1223 phase were investigated via X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-rays (EDX) spectroscopy, Fourier transform infrared (FTIR) spectroscopy and Four-Probe Resistivity (ρ) measurements. Inclusion of these nanoparticles exhibited no change in crystal structure of host CuTl-1223 superconducting phase. Suppression of superconducting properties was probably due to enhanced effective scattering of carriers across magnetic natured MnFe 2 O 4 nanoparticles residing at the grain-boundaries of CuTl-1223 superconductor.

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Section: Introductionmentioning

confidence: 95%

Superconducting Properties of (MnFe2O4)x/CuTl-1223 Composites

Mumtaz¹

2017

JNMS

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“…A major problem in raising j c is to produce a high concentration of efficient pinning sites in the structure of the high-T c material without reducing its superconducting transition temperature [48][49][50]. By selecting appropriate impurities and optimizing their concentration and particle size, one can achieve a trade-off between the increase in j c and the reduction in T c .…”

Section: Chemical Means Of Producing Pinning Sitesmentioning

confidence: 99%

“…Christova et al [48] examined the effect of MgO additions (3, 9, and 10 wt %) on the properties of Bi-2212. Their experimental data demonstrate that the introduction of MgO makes the superconducting tran-sition sharper and increases the density (reduces the porosity) of the material.…”

Section: Chemical Means Of Producing Pinning Sitesmentioning

confidence: 99%

Physicochemical methods of enhancing the performance of high-Tc superconductors

2004

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Experimental data are summarized on the optimization of the performance of YBa 2 Cu 3 O 7x , Bi 2 Sr 2 CaCu 2 O 8 + δ , and (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10 + δ high-T c ceramics by producing structural defects via irradiation or doping with metals and different inorganic compounds. A classification of additions is proposed according to their interaction with the superconductors. For additions having an advantageous effect on the superconducting and mechanical properties of the high-T c materials, the optimum concentration and size ranges are indicated. S92 INORGANIC MATERIALS Vol. 40 Suppl. 2 2004 MIKHAILOV et al .c ^ s ^ z ^

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“…Previous study on the conventional superconductors showed that defects in dimensions comparable to the superconducting coherence length are much more effective in pinning flux lines. Nanosize MgO increases the critical current when the maximum heat treatment temperature was 910 8C [7] but no significant enhancement in J c was observed after nanometric SnO 2 powder was added into YBCO [8].…”

Section: Introductionmentioning

confidence: 97%