publications by F. Hadley Cocks.

Papers Published

1. Watkins, S.A. and Cocks, F.H., X-ray and neutron diffraction of yttrium-barium-copper-oxide: modeling diffraction intensity variations produced by surface leaching, J. Mater. Res. (USA), vol. 14 no. 7 (1999), pp. 2773 - 7 .
   (last updated on 2007/04/10)

   Abstract:
   High normal current fluences have long been reported to produce major changes in the X-ray diffraction pattern of YBa₂Cu₃O_7-x (YBCO). These X-ray diffraction effects have now been shown to result from the removal of barium from the YBCO near-surface lattice together with the formation of a thin barium oxide overlayer. Neutron diffraction reveals that the bulk crystallographic structure remains unaltered by charge fluences of more than 40 million C/cm², and Auger electron spectroscopy confirms the presence of surface barium enrichment

   Keywords:
   Auger electron spectra;barium compounds;high-temperature superconductors;neutron diffraction;surface treatment;X-ray diffraction;yttrium compounds;