Influence of high-pressure deformation and annealing on the structure and properties of a bulk MgB2 superconductor
- Authors: Degtyarev M.V.1, Pilyugin V.P.1, Akshentsev Y.N.1, Kuznetsova E.I.1, Krinitsina T.P.1, Blinova Y.V.1, Sudareva S.V.1, Romanov E.P.1
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Affiliations:
- Institute of Metal Physics, Ural Branch
- Issue: Vol 117, No 8 (2016)
- Pages: 772-782
- Section: Electrical and Magnetic Properties
- URL: https://journals.rcsi.science/0031-918X/article/view/166243
- DOI: https://doi.org/10.1134/S0031918X16080032
- ID: 166243
Cite item
Abstract
A synthesized MgB2 superconductor has been investigated by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and by the measurements of the superconducting characteristics and microhardness after cold high-pressure deformation in a Toroid chamber and in Bridgman anvils and subsequent high-temperature annealing. A nanocrystalline structure is formed in the superconductor after high-pressure treatment, but internal cracks appear, and the critical current density decreases strongly. The annealing leads to a coarsening of the structure and to an increase in the critical current density up to 5.8–6.7 × 104 А/сm2, which is more than three times greater than that in the initial state.
Keywords
About the authors
M. V. Degtyarev
Institute of Metal Physics, Ural Branch
Email: sudareva@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620137
V. P. Pilyugin
Institute of Metal Physics, Ural Branch
Email: sudareva@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620137
Yu. N. Akshentsev
Institute of Metal Physics, Ural Branch
Email: sudareva@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620137
E. I. Kuznetsova
Institute of Metal Physics, Ural Branch
Email: sudareva@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620137
T. P. Krinitsina
Institute of Metal Physics, Ural Branch
Email: sudareva@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620137
Yu. V. Blinova
Institute of Metal Physics, Ural Branch
Email: sudareva@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620137
S. V. Sudareva
Institute of Metal Physics, Ural Branch
Author for correspondence.
Email: sudareva@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620137
E. P. Romanov
Institute of Metal Physics, Ural Branch
Email: sudareva@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620137