Bulg. J. Phys. vol.26 no.1-2 (1999), pp. 071-075
Superconducting Cd and Ca Doped 123 Phase in Cd0.8Ba2(Y0.7Ca0.4)Cu3.5Oy
N. Balchev1, V. Kovachev1, J. Thomas2, W. Bieger2, K. Konstantinov3, B. Kunev4
1Institute of Solid State Physics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
2Institut für Festkorper- und Werkstofforschung Dresden, 01171 Dresden, Germany
3Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
4Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
go back1Institute of Solid State Physics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
2Institut für Festkorper- und Werkstofforschung Dresden, 01171 Dresden, Germany
3Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
4Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Abstract. A new Cd-containing superconductor with nominal composition of Cd0.8Ba2(Y0.7Ca0.4)Cu3.5Oy and Tc = 80 K was synthesized and investigated. The obtained XRD pattern shows that the dominating phase is an orthorhombic 123. It was shown that the presence of Cd and Ca facilitates the 123 phase formation. The results of the EDX analysis on SEM and TEM have shown that the distribution of the Cd and Ca in the samples is inhomogeneous. The two elements enter the 123 phase in most of the investigated crystals and form a new Cd-Ba-Y-Ca-Cu-O superconducting compound.