[institut] Reminder: Center for Solid State Physics and New Materials Seminar: Prof. Ali Gencer , 10. 06. 2025. at 13h

[Nenad Lazarevic]

Dear colleagues,

You are kindly invited to the Center for Solid State Physics and New
Materials seminar, which will be held on Tuesday, 10. 06. 2025. at
13:00, in the "Dragan Popović" lecture hall of the Institute of Physics
Belgrade.The talk entitled:

Influence of Reaction Kinetics on MgB2 Wires with Enhanced Properties:
Optimization of Copper-Coated Magnesium Rod and Carbon-Coated Nano-Boron
Powders in IMD Process 
will be given by Prof. Ali Gencer (Ankara University, Superconductor
Technologies Application and Research Center,
06830-Gölbaşı-Ankara,Türkiye). The abstract of the talk:

Magnesium diboride (MgB₂) wires fabricated by Internal Magnesium
Diffusion (IMD) process are of renewed recent interest for potential
superconducting applications due to their improved superconducting
properties with flux pinning, high critical temperature (Tc ≈ 39 K),
cost-effectiveness, and potential for large-scale production. This talk
focuses on the impacts of varying copper coatings on magnesium rods and
the incorporation of different carbon-coated boron powders with
experimental works on the microstructural and superconducting properties
of MgB₂ wires. By systematically varying the copper coating content on
Mg rods at various percentages and the carbon coated boron powder
precursors, we aim to optimize the enhanced critical current density
(Jc) especially in the applied magnetic fields. Characterization
techniques such as optical microscopy, scanning electron microscopy
(SEM) coupled with energy-dispersive X-ray spectroscopy (EDS), DTA
analysis for reaction kinetics and electrical transport measurements
were carried out to investigate the effects of porosity, grain
connectivity, morphology, and superconducting physical properties of the
MgB₂ wires. 

The results show that both carbon and copper doping play an important
role in enhancing flux pinning by introducing nanoscale defects and
impurities that act as pinning centers for the vortices. However,
excessive doping or improper copper coating thickness can lead to the
formation of unwanted secondary phases and defects, which may a negative
effect the superconducting properties and mechanical stability. 

In conclusion, this study provides valuable insights into optimizing the
IMD process for the fabrication of high performance MgB₂ wires. By
balancing the thickness of the copper coating and the concentration of
carbon doping, improved superconducting properties can be achieved,
making the processed MgB₂ wires highly suitable for applications such as
magnetic resonance imaging (MRI), particle accelerators, and high-field
magnets. Experimental results with model dependent analysis will be
presented to achieve higher critical current density at fields exceeding
from 1 to 12 T.   

This work has been supported by TÜBİTAK and Chinese Academy of Sciences
(CAS) via Bilateral Cooperation under contract No: 123N624 
Best Regards,
Nenad Lazarevic

-- 
Center for Solid State Physics and New Materials,
Institute of Physics Belgrade
Pregrevica 118, 11080 Belgrade, Serbia
http://www.ipb.ac.rs/
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