Structure of tellurite glasses - Effects of K2O or P 2O5 additions studied by diffraction

U. Hoppe, I. Gugov, H. Bürger, P. Jóvári, A. C. Hannon

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Abstract

Neutron and x-ray diffraction experiments of high resolving power with neutrons from a spallation source and high-energy photons from a synchrotron have been performed on compositional series of binary tellurite glasses with additions of K2O or P2O5 (max. 16 or 32 mol%). Since the P-O bond lengths do not interfere with the Te-O peaks the Te-O and O-O correlations are approximated by Gaussian fitting of the x-ray and neutron correlation functions up to lengths of 0.28 nm. In the case of K 2O-TeO2 glasses reasonable assumptions are made for the K-O first-neighbour peaks. Te-O and O-O coordination numbers are four and five for the glasses of compositions close to pure TeO2 which indicates formation of a three-dimensional network of corner-connected TeO4 trigonal bipyramids. The tellurite network groups are TeO4 and TeO3 units in K2O-TeO2 glasses and TeO 4 and TeO5 units in P2O5-TeO 2 glasses. Additional Te-O neighbours found at 0.23 nm <r <0.26 nm for K2O-TeO2 glasses suggest the existence of TeO3+1 units and those found at 0.23 nm <r <0.29 nm for the P2O5-TeO2 glasses indicate the existence of distorted TeO6 polyhedra. Tellurite networks are flexible to form the appropriate coordination environments for quite different ions or groups of opposite charge such as K+ ions and (PO4/2)- tetrahedra where change of the TeOn network units provides the needed number of oxygen neighbours.

Original languageEnglish
Pages (from-to)2365-2386
Number of pages22
JournalJournal of Physics Condensed Matter
Volume17
Issue number15
DOIs
Publication statusPublished - Apr 20 2005

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phosphorus pentoxide
Diffraction
Glass
glass
diffraction
Neutrons
neutrons
Ions
X rays
Optical resolving power
Bond length
spallation
tellurous acid
polyhedrons
Synchrotrons
coordination number
tetrahedrons
Light sources
synchrotrons
ions

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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Structure of tellurite glasses - Effects of K2O or P 2O5 additions studied by diffraction. / Hoppe, U.; Gugov, I.; Bürger, H.; Jóvári, P.; Hannon, A. C.

In: Journal of Physics Condensed Matter, Vol. 17, No. 15, 20.04.2005, p. 2365-2386.

Research output: Contribution to journalArticle

Hoppe, U. ; Gugov, I. ; Bürger, H. ; Jóvári, P. ; Hannon, A. C. / Structure of tellurite glasses - Effects of K2O or P 2O5 additions studied by diffraction. In: Journal of Physics Condensed Matter. 2005 ; Vol. 17, No. 15. pp. 2365-2386.
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