Fine structure of a bulk MgB2 superconductor after deformation and heat treatment
- Authors: Kuznetsova E.I.1, Krinitsina T.P.1, Blinova Y.V.1, Degtyarev M.V.1, Sudareva S.V.1
-
Affiliations:
- Mikheev Institute of Metal Physics, Ural Branch
- Issue: Vol 118, No 4 (2017)
- Pages: 346-353
- Section: Electrical and Magnetic Properties
- URL: https://journals.rcsi.science/0031-918X/article/view/167005
- DOI: https://doi.org/10.1134/S0031918X1704007X
- ID: 167005
Cite item
Abstract
The structure of the MgB2 superconductor subjected to high-temperature restoration annealing after cold deformation under high pressure in a Toroid chamber or Bridgman anvils has been investigated by transmission electron microscopy. It has been shown that after postdeformation annealing at 950°C the average size of crystallites in the matrix phase increases 5–10 times compared to the deformed state, reaching ~50–150 nm, as well as the critical current density increases by a factor of three (up to 6.7 × 104 A/cm2, 30 K) compared to the initial state. It has been found that the MgO phase and the higher magnesium borides are present in the form of dispersed precipitates 10–70 nm in size.
Keywords
About the authors
E. I. Kuznetsova
Mikheev Institute of Metal Physics, Ural Branch
Email: sudareva@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620990
T. P. Krinitsina
Mikheev Institute of Metal Physics, Ural Branch
Email: sudareva@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620990
Yu. V. Blinova
Mikheev Institute of Metal Physics, Ural Branch
Email: sudareva@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620990
M. V. Degtyarev
Mikheev Institute of Metal Physics, Ural Branch
Email: sudareva@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620990
S. V. Sudareva
Mikheev Institute of Metal Physics, Ural Branch
Author for correspondence.
Email: sudareva@imp.uran.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620990
Supplementary files
