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Journal Article

Two dimensional γ-irradiations for promoted structural properties of MgB2 superconductors

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Elsabawy,  K. M.
Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Sekkina, M. M. A., & Elsabawy, K. M. (2002). Two dimensional γ-irradiations for promoted structural properties of MgB2 superconductors. Physica C, 377(4), 411-415.


Cite as: https://hdl.handle.net/21.11116/0000-000E-EF7D-A
Abstract
MgB2 was prepared via solid state reaction technique by mixing
stoichiometric amounts of pure boron and magnesium and sintered
at 970 degreesC under argon atmosphere. X-ray measurements for
non-irradiated MgB2 proved that MgB2 mainly belongs to
hexagonal phase with some MgO and B secondary phases in minor.
While gamma-irradiated MgB2 (gamma-absorbed dose = 10 and 20
MR) exhibits structure quality attributable to enhancing action
of gamma-ray to the Mg-ions, diffusion and ordering through
boron matrix consequently reduce the amount of unreacted boron.
Scanning electron microscopy was performed and indicated that
the average grain size is in between 0.3 and 1.35 mum and there
is no MgO detected in the grain boundaries. The transition
temperature for the non-irradiated MgB2 was found to be similar
to37.6 K at the meantime the gamma-irradiated MgB2 (gamma-
absorbed dose = 10 and 20 MR) have been given the same T-c
while T-c = 36.1 K was for MgB2 with gamma-absorbed dose = 40
MR. (C) 2002 Elsevier Science B.V. All rights reserved.