Synthesis, Morphology And Superconductingproperty Characterization Of Mgxb2 And Mgb2 With Sib4 Additions
This project deals with the processing of MgB2 bulk samples and the effect of addition of SiB4. The correlation between fabrication parameters and superconducting properties was studied. MgB2 bulks were prepared by a pellet-inclosed- tube (PICT) and solid-state reaction route methods. MgB2 bulk s...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2009
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/11975/1/FS_2009_40_A.pdf |
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| Summary: | This project deals with the processing of MgB2 bulk samples and the effect of
addition of SiB4. The correlation between fabrication parameters and
superconducting properties was studied. MgB2 bulks were prepared by a pellet-inclosed-
tube (PICT) and solid-state reaction route methods. MgB2 bulk samples were
prepared at different annealing temperatures of 650°C, 700°C, 750°C and 800°C. AC
susceptibility measurements showed a sharp superconducting transition in all the
samples. However, MgB2, samples annealed at 650°C showed slightly low volume
susceptibility compared to other samples. The critical current density (Jc) was
measured using ac magnetic susceptibility measurement method. The highest critical
density in magnetic field, Jc(T,H) from the magnetization measurements was
recorded at 3.0×104A/cm2 (5K, 6T) and 7.0×103 A/cm2 (20K, 4T) for the 650°C
annealed MgB2. X-ray diffraction (XRD) analysis showed small quantities of MgO
and unreacted Mg phases as impurities in the samples. The second part of the work
concentrates on Mg non-stoichiometry in MgxB2 (x = 0.8, 1.0 and 1.2) samples. The
critical temperature (Tc), was significantly reduced in sample x = 0.8 and x = 1.2 as compared to sample with x=1.0. The Mg0.8B2 sample shows the highest Jc at 5K and
20K, followed by Mg1.2B2 and MgB2 samples, respectively. MgB2 shows the lowest
Jc for all temperatures. |
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