STRUCTURE OF AMORPHOUS SE PREPARED BY MILLING

The amorphization of trigonal Se can proceed by mechanical milling. Du ring the amorphization, the second and third nearest neighbours of the trigonal crystal structure were observed to be drastically changed in the RDF(r). The number of atoms located at the second distance (r = 3 .4 Angstrom) is reduced from four to zero as a result of a shift of at oms towards a higher r value. After the amorphization we found that th e number of atoms located in the vicinity of 3.7 Angstrom increased to six. The result leads to the conclusion that the bonding between chai n-molecules in the trigonal Se is destroyed by the strain and defects induced by the milling.