Structure of zinc phosphate glasses of 75 and 80 mole% ZnO content studied by X-ray diffraction and reverse Monte Carlo simulations

Uwe Hoppe, Yanko Dimitriev, Pal Jóvari

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

X-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.

Original languageEnglish
Pages (from-to)517-526
Number of pages10
JournalZeitschrift fur Naturforschung - Section A Journal of Physical Sciences
Volume60
Issue number7
DOIs
Publication statusPublished - Jul 2005

Keywords

  • Glass Structure
  • Reverse Monte Carlo
  • X-Ray Diffraction

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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