The influence of Pr-Ca substitution on phase formation, microstructure and oxygen content in YBCO bulk samples

We have investigated Pr and Ca substitution for Y in Y 1 - y Pr y Ba 2 Cu 3 O 2 and Y 1 - ( x + y ) Ca x Pr y Ba 2 Cu 3 O z bulk samples, where x = 0.25; 0.30 and y = 0.04; 0.05. The effects of this substitution on the phase formation, microstructure and oxygen content in these samples were studied. The observed dependences are discussed.