High-quality MgB2 nanocrystals synthesized by using modified amorphous nano-boron powders: Study of defect structures and superconductivity properties
Source abstract
Abstract
Nano sized magnesium diboride (MgB2) samples were synthesized using various high-quality nano-B precursor powders. The microscopic defect structures of MgB2 samples were systematically investigated using X-ray powder diffraction, Raman, resistivity measurements and electron paramagnetic resonance spectroscopy. A significant deviation in the critical temperature Tc was observed due to defects and crystal distortion. The symmetry effect of the latter is also reflected on the vibrational modes in the Raman spectra. Scanning electron microscopy analysis demonstrate uniform and ultrafine morphology for the modified MgB2. Defect center in particular Mg vacancies influence the connectivity and the conductivity properties which are crucial for the superconductivity applications.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Superconductivity in MgB2 and Alloys · Boron and Carbon Nanomaterials Research · Thermal Expansion and Ionic Conductivity
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemistry, Koç University 1 , Rumelifeneri Yolu, Sariyer, Istanbul, Turkey
Duktus (Production) GmbH 2 , Sophienstraße 52-54, Wetzlar, Germany
Faculty of Engineering and Natural Sciences, Sabanci University 3 , TR-34956 Istanbul, Turkey
Sabanci University, SUNUM Nanotechnology Research Centre 4 , TR-34956 Istanbul, Turkey
Leibniz Institute for Solid State and Materials Research Dresden (IFW) 5 , PO Box 270116, 01171 Dresden, Germany
References (39)
Show source-provided references
1. Superconductivity at 39 K in magnesium diboride10.1038/35065039 ↗
2. Defect structure of ultrafine MgB2 nanoparticles10.1063/1.4902375 ↗
3. Effect of temperature and pressure to pinning centers in bulk MgB2 under high pressure10.1063/1.4892647 ↗
4. Superconductivity in MgB2 and its related materials10.1143/ptps.159.326 ↗
5. Kohn · 1960
6. Flükiger · 201610.1142/9830 ↗
7. Effect of boron powder purity on superconducting properties of bulk MgB210.1016/j.physc.2007.04.112 ↗
8. Critical current density and flux pinning in superconducting MgB210.1016/j.physc.2008.05.094 ↗
9. S. Acar, Koc University, PhD thesis, 2012.
10. Review on magnesium diboride (MgB2) as excellent superconductor: Effects of the production techniques on the superconducting properties
11. Effect of boron particle size on the formation and superconductivity of MgB210.2497/jjspm.50.306 ↗
12. Pore structures and grain connectivity of bulk MgB210.1016/j.physc.2009.05.111 ↗
13. Correlation between in-field Jc enhancement and grain connectivity in co-doped MgB2 superconductor10.1016/j.matlet.2014.09.076 ↗
14. Nanoscale disorder in pure and doped MgB2 thin films10.1088/0953-2048/23/9/095008 ↗
15. Nanoscale disorder in high critical field, carbon-doped MgB2 hybrid physical-chemical vapor deposition thin films10.1063/1.2775088 ↗
16. High temperature heat treatment on boron precursor and PIT process optimization to improve the Jc performance of MgB2-based conductors10.1088/0953-2048/26/10/105022 ↗
17. Somer · 2016
18. A novel process to produce amorphous nanosized boron useful for MgB2 synthesis10.1109/tasc.2012.2190510 ↗
19. Plasma synthesized boron nano-sized powder for MgB2 wires10.1063/1.3402315 ↗
20. Matkovich · 1977 · 21410.1007/978-3-642-66620-9 ↗
21. Electron paramagnetic resonance and Raman spectroscopy studies on carbon-doped MgB2 superconductor nanomaterials10.1063/1.4918608 ↗
22. Al-doped MgB2 materials studied using electron paramagnetic resonance and Raman spectroscopy10.1063/1.4949338 ↗
23. Strong influence of boron precursor powder on the critical current density of MgB210.1088/0953-2048/18/11/011 ↗
24. Influence of nanocrystalline boron precursor powder on superconductivity in MgB2 bulk10.1166/jnn.2009.1764 ↗
25. Fabrication and superconducting properties of MgB2 composite wiresby the PIT method10.1088/0953-2048/15/1/303 ↗
26. Hot isostatic pressing of bulk magnesium diboride10.1080/09500830110093236 ↗
27. An inexpensive and easy experiment to measure the electrical resistance of high-Tc superconductors as a function of temperature10.1119/1.18715 ↗
28. The widely variable resistivity of MgB2 samples10.1088/0953-2048/16/6/201 ↗
29. Effects of Fe substitution on the transport properties of the superconductor MgB2
30. Effect of electron irradiation on superconductivity in single crystals of Ba(Fe1−xRux)2As2(x=0.24)
31. The effect of synthesis temperature on the superconducting properties of n-SiC added bulk MgB2 superconductor10.1088/0953-2048/24/4/045013 ↗
32. Influence of boron powder purification on the connectivity of bulk MgB210.1088/0953-2048/19/8/l02 ↗
33. A correlation between transport current density and grain connectivity in MgB2/Fe wire made from ball-milled boron10.1063/1.3129314 ↗
34. Magnetic field dependent microwave absorption studies on a MgB2 superconductor10.1088/0953-2048/14/8/311 ↗
35. ESR studies on high-Tc superconductor MgB210.1016/s0921-4534(03)00896-7 ↗
36. Ab initio computational studies of mg vacancy diffusion in doped MgB2 aimed at hydriding kinetics enhancement of the LiBH4 + MgH2 system10.1021/jp1066567 ↗
37. Influence of Mg deficiency on crystal structure and superconducting properties in MgB2 single crystals
38. Electron spin resonance and microwave absorption study of MgB2
39. Electron spin resonance in ternary intermetallic compounds with MgAgAs structure10.1088/0305-4608/18/10/016 ↗