Nano boyutta Fe3O4 katkılandırılmış MgB2 süper iletkenin manyetik karekterizasyonu
Özet
MgB2 is a promising superconductor and expected to replace conventional superconductors (for example, NbSn) being used in applications due to its low cost providing that its physical properties are enhanced. It is shown very recently that Boron is responsible for superconducting properties. MgB2 is classified as type II superconductor and flux dynamics must be controlled in order to enhance physical properties. In this work, we have added nano particles of Fe3O4 (FM) at various percentages from 0% to 10%. We have searched the effects of nano-particle content by using the characterization methods of XRD and ac susceptibility. Our XRD measurements show that the additions of Fe3O4 did not change the lattice parameters of pure MgB2. Therefore, we can say that there was not a chemical reaction between MgB2 and Fe3O4. According to our ac susceptibility measurements, we find the transition temperature as 38,6K. Under the same magnetic field, the magnitude of addition has not an effect on Tp. On the other hand, application of increasing magnetic field on the same sample decreased the Tp value gradually. Unfortunately, Fe3O4 did not spread homogeneously in MgB2. Moreover, Fe3O4 did not enter the lattice structure of MgB2. It has been envisaging that Fe3O4 is at the grain boundary. Because of that, there was not a systematic increase in the superconducting property of the samples. To get rid of this, samples may be prepared from the starting powders of Mg and B instead of MgB2 as the starting powder.