Structural investigation of higher order members of bismuth system superconductors

Title

Structural investigation of higher order members of bismuth system superconductors

Creator

Ashoka N.V.; George Thomas C.; Srinivasan K.

Description

Structural formation of higher order Bismuth superconducting compounds Bi1.65Pb0.35Sr2Ca4Cu5Oy (2245) phase and Bi1.65Pb0.35Sr2Ca8Cu9Oy(2289) phase were investigated. The samples were synthesized by solid state reaction technique. Morphological and micro-structural features of the synthesized samples were analysed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX). The XRD of both the samples revealed the presence of Bismuth - (2212)& (2223) phases of which (2223) phase was found to be the predominant. The average grain size was found to be around 65 nm. Traces of Ca2PbO4 was also noticed when the samples were synthesised at 835 C. Superconducting transition temperature (TC) of the samples measured by self-inductance method, showed a two-step transition, one around 110 K and the other around 90 Kindicating the presence of (2223)&(2212) phases respectively. But the TC value observed for (2212) phase is about 10 K more than the expected value of 80 K. There was no signature of the formation of (2245) or (2289) phases in this synthesis.

Source

International Journal of ChemTech Research, Vol-6, No. 3, pp. 1733-1735.

Date

2014-01-01

Publisher

Sphinx Knowledge House

Subject

EDAX; Phase formation; SEM; X-Ray diffraction

Coverage

Ashoka N.V., Department of Physics, Christ University, Bangalore, India; George Thomas C., Department of Physics, Christ University, Bangalore, India; Srinivasan K., Department of Physics, Govt. First Grade College, Bangalore, India

Rights

Restricted Access

Relation

ISSN: 9744290

Format

Online

Language

English

Type

Article

Identifier

https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902181506&partnerID=40&md5=52c716a561836ad018e90f98ceb02ad1