Syntheses and Properties of the High-Tc Superconductive Bi_{2-x}Mo_xSr_2Ca_2Cu_3O_y$ System

• Published in: Bulletin of the Korean Chemical Society Vol. 11; no. 1; pp. 25 - 28
• Main Authors: Keu Hong Kim, Jong Tae Lim, Seung Koo Cho, Byoung Chan Kwak, Don Kim, Jae Shi Choi
• Format: Journal Article
• Language: Korean
• Published: 1990
• ISSN: 0253-2964; 1229-5949

The superconducting properties have been studied for high-Tc superconductors of the $Bi_{2-x}Mo_xSr_2Ca_2Cu_3O_y$ system (x = 0.03-0.30). The crystal structure is pseudo tetragonal with the average lattice parameters a = 5.38 ${\AA}$, b = 5.44 ${\AA}$ and c = 30.6 ${\AA}$. All samples exhibit superconductivity with Tc offset at 79 K and Tc onset at 90-115 K. The Tc onset point decreases with increasing x, but the Tc offset points are nearly the same for all samples. Scanning electron micrographs show a special growth behavior of the grains with a plate shape. It is suggested that the decrease in Tc onset points with substitution of Mo for Bi is due to the decrease in lattice parameters and to the p-orbital of Mo. It is concluded that Mo does not play a crucial role in the superconducting transition of the $Bi_2Sr_2Ca_2Cu_3O_y$ system.