Hoppe U.Dimitriev Y.Jóvari P.2024-11-132024-11-142024-11-132024-11-142005-01-010932-078410.1515/zna-2005-0709SCOPUS_ID:23944489849https://rlib.uctm.edu/handle/123456789/1477X-Ray diffraction, using high-energy photons from a synchrotron, was used to extend the investigation of (ZnO)x(P2O 5)1-x glasses to samples of ZnO content close to x = 0.8 which were obtained by roller-quenching. The isolated PO4 tetrahedra are surrounded by ZnO polyhedra, where Zn-O coordination numbers of ∼ 4.5 are determined. The small increase of NZnO ∼ 4 at metaphosphate composition (x = 0.5) to ∼ 4.5 is not sufficient to explain the strong increase of the packing density beyond the minimum at x = 0.5. The medium-range order was analyzed on the basis of partial SPP(Q) and S ZnZn(Q) factors obtained from Reverse Monte Carlo simulations of glasses with 0 ≤ x ≤ 0.8. The positions of the first peaks in these factors, the number densities of P and Zn atoms and knowledge of definite P-P and Zn-Zn distances were used to check the applicability of simple models such as the dense packing of uniform P- and Zn-centered spherical environments for glasses with x = 0.8 and 0.5, the packing of corrugated sheets for vitreous P2O5 and the packing of phosphate chains for Zn metaphosphate glass. © 2005 Verlag der Zeitschrift für Naturforschung, Tübingen.enArticle