The single crystal superconducting Bi-2212 whiskers fabrication and their thermal transport properties

In this study, we have fabricated the superconducting single crystal whiskers using glass-ceramic BiSr-CaCuO material. The crystallization kinetic studies (crystallization activation energy, E-a, and the Avrami parameter, n,) were carried out using DTA data. The oxygen diffusion energy was calculated using TG data. XRD and SEM analysis of the whiskers showed Bi-2212 phase formation and the c-axis orientation. The in-plane resistivity, rho(ab), and the out-of-plane resistivity, rho(c), properties of the whiskers were investigated. The thermoelectric power. S(T), value between 10 and 300 K is found to be positive, indicating that charge carriers in the whiskers are holes. We analyzed the thermoelectric power as a function of temperature with "Two band model with linear T-term" Linear temperature dependence in the thermal conductivity down to T-c and then a sharp rise just below T-c were obtained. (C) 2010 Elsevier B.V. All rights reserved.