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XANES; phase-shifts; metallic-glasses; co-ordination number; bond distances; near-neighbour environment; single-scattering; multiple-scattering; polk model; synchrotron radiation

XANES and EXAFS techniques are proving very popular in the study of local environment in disordered systems. Results of such studies in a large number of metal (Fe, Co, Ni, etc)-metalloid (B, Si, C, etc) glasses are reported. Experiments were done with synchrotron radiation as well as an x-ray tube. The values of bond lengths and co-ordination numbers computed from one-electron single scattering Fourier transform method turn out substantially smaller. The values of bondlength determined from the other EXAFS calculation method and the multiple-scattering computation scheme show good agreement. Importance of choice of suitable reference materials for analysis of data is emphasized.

K B Garg¹ Kavita S Jerath¹ H S Chauhan¹ Usha Chandra¹

1. Department of Physics, University of Rajasthan, Jaipur - 302 004, India

Published

December 1986

Manuscript received

14 July 1986

Manuscript revised

24 September 1986