AN X-RAY-ABSORPTION STUDY OF DOPED SPHALERITES

Metal K-edge X-ray absorption spectra of Mn, Mn/(Fe), Cu/In, Cu/In/(Fe ) and Cd doped zinc sulfides are reported. The Zn K-edge XANES shows t hat there is little change on the low-lying vacant electronic states o f the Zn. Furthermore, the Zn EXAFS indicates that the coordination si te of the Zn is almost unchanged by any of the dopants. Mn, Cu, In and Cd K-edge EXAFS show that the local S tetrahedra around the dopant ar e compressed for Cu and expanded for Mn, In and Cd. Moreover the secon d coordination sphere indicates that clustering occurs in the Cu/In- a nd Cd-doped materials. M-S bond distances of the dopants in sphalerite are: Cd-S, 2.48 Angstrom In-S, 2.43-2.45 Angstrom, Cu-S, 2.30-2.33 An gstrom and Mn-S, 2.41-2.43 Angstrom.