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X-Ray Characterization of Phase Equilibria of the Raveau and 2212 Phases in the Bi-Sr-Ca-Cu-0 System

Published online by Cambridge University Press:  06 March 2019

Winnie Wong-Ng ,
Lawrence P. Cook  and
F. Jiang
Winnie Wong-Ng
Affiliation:
Ceramics Division National Institute of Standards and Technology Gaithersburg, MD 20899
Lawrence P. Cook
Affiliation:
Ceramics Division National Institute of Standards and Technology Gaithersburg, MD 20899
F. Jiang
Affiliation:
Geology Department University of Maryland College Park, MD 20542
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Abstract

Phase equilibria of two superconductor phases, namely the 20K Raveau phase (Bi2.2-xSr1.8+xCuOz, currently referred to as the 11905 phase) and the 80K 2212 phase of the Bi-Sr-Ca-Cu-0 system were investigated. The amount of Ca-substitution of the Raveau solid solution was determined and the solid solution region can be approximately described as Bi2.2+xSr1.8-X-Y CayCu1±x/2Ow (referred to as the Ca-Raveau phase or the 119x5, ‘ with 0<x<0.15, 0<y<0.5. To determine the melting equilibria of the 2212 phase, a procedure involving the use of a wicking technique to capture the melt was applied. X-ray powder diffraction (XPD) and quantitative energy dispersive x-ray spectroscopy (EDS) were used to analyse the phases present in the residual and melt, respectively. The approximate primary crystallization field of the incongruently melting 2212 phase was illustrated.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 39: Forty-Fourth Annual Conference on Applications of X-ray Analysis, July 31 - August 4, 1995 , 1995 , pp. 731 - 738
Copyright
Copyright © International Centre for Diffraction Data 1995

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