LIANG Ruixing, INAGUMA Yoshryuki, TAKAGI Yoshiki, NAKAMURA Tetsuro
Journal of the Ceramic Society of Japan, 96(1112) 501-502, Apr 1, 1988
The oxygen nonstoichiometry in the high T_c superconductor Ba_2SmCu_3O_<7-x> was determined over the temperature range of 350° to 900℃ under the oxygen partial pressure between 10^<-3> and 1 atm, with the thermogravimetric measurement calibrated by the iodometric titration technique. The temperature dependency of the nonstoichiometry indicates that a phase transition occurs at a temperature between 600°and 700℃.