STRUCTURAL RELAXATION OF GESE2 CHALCOGENIDE GLASS STUDIED WITH USE OFTHE RADIAL-DISTRIBUTION FUNCTION

The short- and medium-range orders of GeSe2 chalcogenide glass were st udied by using the radial distribution function. The effect of the ann ealing temperature on the short-range order structure of this glass wa s investigated. The short-range order structure of as-prepared and ann ealed GeSe2 chalcogenide glass is regular tetrahedron (edge and corner sharing GeSe4 tetrahedra). The medium-range order of the GeSe, chalco genide glass is chemical order associated with topological order. The topological structure of the medium-range order can be described by th e Phillips model. The basic structure unit does not change after annea ling. Most changes observed in the diffraction patterns may be interpr eted in the framework of structural relaxation during which a system t ends to attain a metastable equilibrium state. This relaxation can be described by an a process.