Effect of Rb Substitution on the Structural, Physical and Superconducting Properties of Bi-2212 Superconductor

Abstract

In this research, the effects of Rubidium (Rb) inclusion on the microstructural, physical and superconducting properties of Bi₂Sr₂Ca_1-xRb_xCu₂O_8+y with x=0.0, 0.025, 0.05, 0.075, 0.10, and 0.125, superconductor have, in detail, been studied. For this purpose, the samples were prepared through the classical solid state reaction route. From the XRD patterns, the crystal symmetries of samples were determined as pseudo tetragonal and consist of dominant Bi-2212 phase together with small amount of secondary phases. SEM-EDX results have confirmed that the major phase is related to Bi-2212, with minor amounts of secondary phases. In magnetization versus temperature measurements, very sharp diamagnetic transition is observed. The superconducting critical temperatures, T_C, for all samples are obtained around 80 K. From M-H measurement, it has been found that all samples have very narrow loop areas. By using the data from M-H measurements in the Bean model, the intragranular critical field, J_C, has been determined. It has been found that the pure Bi-2212 (x=0.0) sample shows the highest superconducting properties and the largest J_Cvalues (2,2x10⁴ A/cm² at 10 K). 

Keywords

• Bi-2212,Rubidium substitution

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