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https://doi.org/10.5562/cca2985

Microstructural Features of Magnetic NiCoB Nanoparticles Addition to MgB2 Precursor Powders

Ivana Lončarek ; Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, HR-10000 Zagreb, Croatia
Anđelka M. Tonejc ; Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, HR-10000 Zagreb, Croatia
Željko Skoko ; Department of Physics, Faculty of Science, University of Zagreb, Bijenička cesta 32, HR-10000 Zagreb, Croatia
Nikolina Novosel ; Institute of Physics, Zagreb, Bijenička cesta 46, HR-10000, Croatia
Mislav Mustapić ; Josip Juraj Strossmayer University of Osijek, Department of Physiscs, Trg ljudevita Gaja 6, HR-31000 Osijek, Croatia

Puni tekst: engleski, pdf (4 MB) str. 37-51 preuzimanja: 317* citiraj
APA 6th Edition
Lončarek, I., Tonejc, A.M., Skoko, Ž., Novosel, N. i Mustapić, M. (2017). Microstructural Features of Magnetic NiCoB Nanoparticles Addition to MgB2 Precursor Powders. Croatica Chemica Acta, 90 (1), 37-51. https://doi.org/10.5562/cca2985
MLA 8th Edition
Lončarek, Ivana, et al. "Microstructural Features of Magnetic NiCoB Nanoparticles Addition to MgB2 Precursor Powders." Croatica Chemica Acta, vol. 90, br. 1, 2017, str. 37-51. https://doi.org/10.5562/cca2985. Citirano 20.10.2019.
Chicago 17th Edition
Lončarek, Ivana, Anđelka M. Tonejc, Željko Skoko, Nikolina Novosel i Mislav Mustapić. "Microstructural Features of Magnetic NiCoB Nanoparticles Addition to MgB2 Precursor Powders." Croatica Chemica Acta 90, br. 1 (2017): 37-51. https://doi.org/10.5562/cca2985
Harvard
Lončarek, I., et al. (2017). 'Microstructural Features of Magnetic NiCoB Nanoparticles Addition to MgB2 Precursor Powders', Croatica Chemica Acta, 90(1), str. 37-51. https://doi.org/10.5562/cca2985
Vancouver
Lončarek I, Tonejc AM, Skoko Ž, Novosel N, Mustapić M. Microstructural Features of Magnetic NiCoB Nanoparticles Addition to MgB2 Precursor Powders. Croatica Chemica Acta [Internet]. 2017 [pristupljeno 20.10.2019.];90(1):37-51. https://doi.org/10.5562/cca2985
IEEE
I. Lončarek, A.M. Tonejc, Ž. Skoko, N. Novosel i M. Mustapić, "Microstructural Features of Magnetic NiCoB Nanoparticles Addition to MgB2 Precursor Powders", Croatica Chemica Acta, vol.90, br. 1, str. 37-51, 2017. [Online]. https://doi.org/10.5562/cca2985

Sažetak
Magnesium diboride (MgB2) is a superconductor characterized by interesting properties like rather high superconducting transition temperature Tc = 39 K, long coherence length and low anisotropy. In addition, it has a very simple crystal structure and low density. Those properties make the MgB2 an ideal candidate for a wide range of applications.
To improve the electromagnetic properties of MgB2, magnetic nickel-cobalt-boron (NiCoB) nanoparticles (mean grain size 17 ± 3 nm) were added to Mg and B precursor powders and sintered at 650 °C, i.e. the temperature of MgB2 superconductor formation. The nearly spherical NiCoB nanoparticles, as-prepared by the chemical reduction of metallic salts, were amorphous according to previous study. The resulting MgB2 sample, formed after the sintering at 650 °C, was subjected to detailed microstructural analysis which included the application of various experimental methods: XRD, FE-SEM, EDS, elemental mapping, TEM and SAED. The methods confirmed the formation of new crystal CoNi phase (due to heat treatment at 650C), consisting of spherical nanoparticles (~ 6 nm) with tendency to spherical agglomerates formation. Those nanosized magnetic particles (characterized by the single domain magnetic structure and blocking temperature TB below room temperature), located at MgB2 grain boundaries, could serve as effective magnetic pinning centers in MgB2, thus improving its electromagnetic properties.

Creative Commons License This work is licensed under a Creative Commons Attribution 4.0 International License.

Ključne riječi
magnesium diboride; CoNi nanoparticles; X-ray diffraction; Rietveld refinement; scanning electron microscopy (SEM); transmission electron microscopy (TEM)

Hrčak ID: 182670

URI
https://hrcak.srce.hr/182670

Posjeta: 498 *