title: (31)P solid-state NMR studies of the short-range order in phosphorus-selenium glasses.
abstract: The local structure of P-rich and Se-rich phosphorus-selenium glasses was studied using high-resolution (31)P solid-state MAS NMR. Two-dimensional (31)P homonuclear through-bond correlation MAS experiments and 2D homonuclear J-resolved MAS measurements were performed at high spinning frequency to probe P-P and P-Se-P connectivities between the different P sites for the compounds in two glass-forming regions, P(2.5)Se(97.5)-P(50)Se(50) and P(67)Se(33)-P(84)Se(16). Amorphous phosphorus and crystalline alpha-P(4)Se(3) and beta-P(4)Se(3) were also studied as reference materials. Glasses from the Se-rich region contain mainly three- and four-coordinated P sites linked together by Se(n) chains, whereas P-rich glasses contain a mixture of P(4)Se(3) molecular units and possibly other structural units embedded in a red-phosphorus-like polymeric network.
authors.affiliation: Conditions Extrêmes et Matériaux: Haute Température et Irradiation (CEMHTI) 1D, Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France. bytchkov@esrf.fr
authors.forename: Aleksei
authors.initials: A
authors.lastname: Bytchkov
authors.forename: Franck
authors.initials: F
authors.lastname: Fayon
authors.forename: Dominique
authors.initials: D
authors.lastname: Massiot
authors.forename: Louis
authors.initials: L
authors.lastname: Hennet
authors.forename: David L
authors.initials: DL
authors.lastname: Price