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

Year 2019, Volume: 2 Issue: 2, 49 - 52, 26.12.2019

İbrahim Ergin Bekir Özçelik Andres Sotelo Maria Madre

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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