Abstract
We fabricated Sr-Ba-Y-Cu-O ceramics that consists of Sr:Ba:Y:Cu=8x:8(1-x):2:10, where x=0, 0.125, 0.25, 0.375, 0.5 and 0.75, for the purpose of studying the effects of Sr substitution on Ba-Y-Cu-O crystal structure, the electrical and magnetic properties, and the microstructure. By observing the microstructure, it was learned that as the Sr component increases, the grain size of the samples decreases gaining density. The Sr concentration dependence of the lattice constants shows orthorhombic-tetragonal phase transition at x=0.5. The critical onset temperature, Tco decreases as the Sr component increases. However, at x=0.5, when the Tco increases, the resistivity at the room temperature shows the minimun value.
