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Effect of heavy atom disorder on the intensities of powder XRD lines of YBa2Cu3O7-y
Authors:V. S. Tiwari  Sangeeta Chaudhry  Dhananjai Pandey
Affiliation:School of Materials Science and Technology, Banaras Hindu University , Varansi, 221005, India
Abstract:Abstract

It is shown that heavy atom disorder resulting from Y ? Ba, Ba ? Cu and Y ? Cu interchanges due to local stoichiometric constraints can cause significant changes in the intensities of X-ray powder diffraction lines of YBa2Cu3O7-y . A comparison of the theoretically predicted intensities with published patterns for specimens prepared by the conventional dry route reveals that Ba ? Cu interchanges involving copper atoms in the CuO2 planes can occur quite frequently and may be mistaken for (00l) texture.
Keywords:Heavy atom disorder  high T c superconductor  YBa2Cu3O7-y
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