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X-ray powder diffraction analysis of the incommensurate modulated structure of Bi2Sr2CaCu2O8

Published online by Cambridge University Press:  10 January 2013

D. P. Matheis and
R. L. Snyder
D. P. Matheis
Affiliation:
Institute of Ceramic Superconductivity, New York State College of Ceramics at Alfred University, Alfred, New York 14802
R. L. Snyder
Affiliation:
Institute of Ceramic Superconductivity, New York State College of Ceramics at Alfred University, Alfred, New York 14802
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Abstract

X-ray powder diffraction is a convenient tool for monitoring changes in structural parameters due to modifications in sample composition and processing conditions. Due to the complexity of incommensurate modulated structures powder diffraction techniques have not been commonly applied. Programs ALSQ and QRIET have been produced to perform lattice parameter and structure refinements on incommensurate modulated materials with a displacive modulation model. In applying these programs to the Bi2Sr2CaCu2O8 superconductor which has this type of structure, it is shown that a decrease in the lattice parameters and an increase in the modulation vector occurs as the Ca content of the Bi-2212 phase, controlled by the use of the glass ceramic process, increases.

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Type
Research Article
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Powder Diffraction , Volume 9 , Issue 1 , March 1994, pp. 28 - 37
Copyright
Copyright © Cambridge University Press 1994

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