The Role of Cooling Condition on the Superconducting Properties of Tl_(2-x)Hg_xSr_2Ca_2Cu_3O_(10+) System

摘要

Solid state reaction method was used to prepare high temperature superconductor with a nominal composition Tl_(2-x)Hg_xSr_2Ca_2Cu_3O_(10+) (0 x 1). The effect of quenching on the superconducting properties has been investigated by preparing two sets of samples at 1133 K for 3 hrs. The superconducting properties of the samples have been examined by electrical measurements. It is found that a partial substitution for Tl by Hg increases the formation of high-T_c phase and increases its T_c. X-ray diffraction (XRD) pattern analyses have shown a tetragonal structure, and there are at least two superconducting phases.