Thermoelectric power and thermal conductivity study of the Y _3Ba _5Cu _8O _x system (Conference Paper)

摘要

In the present study, the effect of heat treatment conditions on the structural/microstructural, electrical and transport properties, such as thermoelectric power and thermal conductivity, of the Y-358 system was investigated. The Y-123 phase instead of Y-358 were obtained with heat treatments. XRD and SEM analyses showed that the best structural formation was obtained for the sample prepared at 900°C for 24 h. All the samples exhibited the T _c value around 91 K. Positive S(T) value was obtained in all the samples. S(T) data was analyzed by Two band model with linear T-term. In thermal conductivity of the samples, small peak with broad maximum was found just below T _c, unlike that of the HT _c cuprates.