PERGESERAN SUHU KRITIS SUPERKONDUKTOR Bi-Pb-Sr-Ca-Cu-O PADA MEDAN MAGNET TINGGI[The Shift In Critical Temperature Of Bi – Pb – Sr – Ca – Cu – O Superconductors In High Magnetic Field]

Abstract

This work studied the process of making bulk Bi-Sr-Ca-Cu-O superconducting materials as the precursor material of superconducting wire, which was given Pb doping to substitute Bi. The sampel was prepared using wet mixing method. Analyzed by XRD (X-ray diffractometer), EDS (energy dispersive spectroscopy) and electrical resistivity at low temperatures and high magnetic fields. Based on the results of XRD and EDS, it is known that it formed 2212 phase, but a lot of element of C still remains in the sampel. According to the results of resistivity measurement, it shows that this sampel has initial critical temperature (TC onset) at 79K, and final critical temperature (TC final) at 48K. The measurements of the resistivity were also carried out on the magnetic field of 2 and 4 T. TC shifts to lower temperatures due to the presence of a magnetic field. The shift of TC also indicates that the sample has phase of 2212. At temperatures above 79K, visible property of semiconductor appeared, which indicates there are many impurities that are semiconductors.