Short range structures of amorphous Se–Te prepared by mechanical alloying

The time-of-flight neutron scattering measurement was employed in order to elucidate the short range structures for a series of amorphous Se100−xTex (x=0∼20) mixtures synthesized by mechanical alloying (MA). The first peak in the radial distribution functions was resolved into two Gaussian peaks, which correspond to the Se–Se and Se–Te correlations, respectively. Amorphous Se prepared by MA has a lot of dangling bonds. In contrast, for the Se100−xTex samples, Te atoms are preferentially bonded with the dangling bonds of Se atoms with increasing Te concentration and, consequently, a twofold chain structure is formed.