Investigation of the structural and electrical properties of composite materials obtained by mixing 〖bi〗_(1.6) 〖pb〗_(0.4) 〖sr〗_2 〖ca〗_2 〖cu〗_3 o_10 superconductor and 〖la〗_(0.9) 〖sr〗_(0.1) mno_3 maganite compound

Within the scope of this thesis, a high-temperature superconductor Bi1.6Pb0.4Sr2Ca2Cu3O10 with a transition temperature of 110 K and a manganite La0.9Sr0.1MnO3 compound with a magnetic phase transition around 150 K was produced using the sol-gel method. These two compounds were mixed with the help of an ultrasonic bath at three different ratios and sintered at 850 oC for 100 hours to obtain composite materials. Structural characterizations of compounds and composite materials were performed using scanning electron microscopy (SEM), atomic force microscopy (AFM), and x-ray diffraction (XRD) techniques. As a result of XRD analysis, it was found that the Bi1.6Pb0.4Sr2Ca2Cu3O10 superconductor contained Bi-2223 high temperature and Bi-2212 low-temperature phases simultaneously, while La0.90Sr0.1MnO3 manganite compound was formed as a single phase. It has been determined that composite materials contain two different crystal structures depending on the amount of superconducting and manganite phase they contain. From the SEM and AFM images, it was found that the Bi1.6Pb0.4Sr2Ca2Cu3O10 superconductor contains two different phases as plate and rod shapes. On the other hand, it has been observed that two different structures occur depending on the amount of superconducting and manganite phases they contain on the surfaces of composite materials. From the low-temperature resistance measurements (R-T), it was found that the Bi1.6Pb0.4Sr2Ca2Cu3O10 superconductor gained superconductivity at temperatures below 98 K. The metal-insulator (TIM) phase transition temperature of the La0.9Sr0.1MnO3 manganite was found to be 158 K.