Pinning behavior in bulk MgB2 prepared using boron powder refined via high-energy ultra-sonication
| Autor: | Sai Srikanth Arvapalli, Masato Murakami, N. Sakai, Muralidhar Miryala, Milos Jirsa |
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| Rok vydání: | 2021 |
| Předmět: |
Diffraction
High energy Flux pinning Materials science Sonication Analytical chemistry chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Electronic Optical and Magnetic Materials chemistry 0103 physical sciences Grain boundary 010306 general physics 0210 nano-technology Phase analysis Boron |
| Zdroj: | Journal of Superconductivity and Novel Magnetism. 34:1297-1301 |
| ISSN: | 1557-1947 1557-1939 |
| Popis: | We successfully refined a cheap commercial boron powder by means of high-energy ultra-sonication and utilized it in synthesis of bulk MgB2. Rietveld phase analysis of X-ray diffraction pattern revealed completely formed MgB2 with a low amount of MgO. MgB2 bulk prepared of boron ultra-sonicated in ethanol for 15 min showed self-field Jc of around 300 kA/cm2 at 20 K without any compromise in Tc (~39 K). Pinning analysis based on Dew-Hughes expression showed major pinning contribution from grain-boundary pinning (~95.5%), along with a slight contribution from point pinning (4.5%). The microstructure study detected a system of large MgB2 grains (hundreds nm large) and 10–20 nm sized particles, possibly Mg-B-O, formed at MgB2 grain boundaries. |
| Databáze: | OpenAIRE |
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