EXAFS DETERMINATION OF BOND LENGTHS IN ZN1-XFEXS TERNARY ALLOYS

Studies of local atomic structure in the zinc-blende Zn1-xFexS (x = 0. 11-0.50) diluted magnetic semiconductors with the use of the EXAFS tec hnique are reported for the first time. They include the K-edge EXAFS measurements for both cationic elements (Zn, Fe). The experiment was c arried out at room temperature in the transmission mode using synchrot ron radiation of the DCI storage ring in Orsay, France. A detailed EXA FS analysis for different crystal compositions (x) gave a convincing e vidence for a bimodal distribution of the nearest-neighbour interatomi c distances in Zn1-xFexS within the iron solid-solubility limit. It ha s also revealed, within the accuracy of this method, constancy of both the nearest-neighbour cation-anion distances (i.e. Zn-S and Fe-S) in the composition range studied.