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- Title
Superconducting Properties and Microstructure Changes after Heat Treatment of In Situ MgB<sub>2</sub> Wires with Ex Situ MgB<sub>2</sub> Barriers.
- Authors
Filar, Krzysztof; Morawski, Andrzej; Zaleski, Andrzej; Tran, Lan Maria; Czujko, Tomasz; Gajda, Daniel
- Abstract
In our article, we show the results for wires with in situ MgB2 core doped with 8 at % of nano-SiC and ex situ MgB2 barrier doped with 8 at % of nano-diamond. All wires were annealed under high isostatic pressure of 1 GPa for 15 min in a temperature range from 700 to 800 ℃. Measurements were made using the vibrating magnetometer. The critical current density was determined with the Bean model. The study of the structure and composition of the MgB2 material were performed by using a scanning electron microscope (SEM). Our results show that annealing at 700 ℃ under isostatic pressure of 1 GPa allows to significant reduction of Mg and nano-SiC migration from the in situ MgB2 core to the ex situ MgB2 barrier. Further studies indicate that annealing at 750 ℃, under the same pressure of 1 GPa, also inhibits the migration of Mg and nano-SiC from the in situ MgB2 core to the ex situ MgB2 barrier. However, annealing at 800 ℃, and under the pressure of 1 GPa, leads to the total penetration of the barrier by Mg and nano-SiC.
- Subjects
NANODIAMONDS; HEAT treatment; SUPERCONDUCTING wire; CRITICAL currents; SCANNING electron microscopes; MICROSTRUCTURE
- Publication
Journal of Superconductivity & Novel Magnetism, 2022, Vol 35, Issue 6, p1491
- ISSN
1557-1939
- Publication type
Article
- DOI
10.1007/s10948-022-06296-4