Soğutma etkisinin bisrcacuo süperiletken üzerinde taramalı elektron microskopu kullanılarak araştırılması

In this thesis the effect of different cooling rate effects on BSCCO superconductors was investigated. For this sample after annealing at different speeds were cooled to room temperature. According to this cooling rate of temperature drop speed of 273 ° C / min, 136°C/ min, 55°C/ min, 25°C/min, 18°C/ min, respectively. Besides furnace cooling (5 ° C / min) and fast cooling process was also done.Temperature resistivity measurements were made with 10 mA current , between 70 K-160 K temperature . In liquid nitrogen, the critical current density was calculated by measuring the critical current. SEM images were obtained to investigate the surface structure. BSCCO samples, the characteristic peaks of Bi-2212 and Bi-2223 was shown by X-ray measurements and Bi-2212 and Bi-2223 ratio was calculated.136 ° C / min cooling rate and structure of specimens in the SEM image of the flake to be seen more, and this is more compatible of the critical temperature was observed. For Bi-2223 structure 273 ° C / min, 136 ° C / min cooling rate was found to be most suitable. Critical current density is highest at 5 ° C / min which is the slow rate of cooling and the critical current density of samples was found to be increased while the cooling speed is decreased .Key Words: Superconductivity, BSCCO System, Cooling Rate, SEM, Critical Temperature, Critical Current Density