Structure of Ba-Ti-Al-O glasses produced by aerodynamic levitation and laser heating.

Pinit Kidkhunthod, Lawrie Skinner, Adrian Barnes, Wantana Klysubun, HE Fischer

Research output: Contribution to journalArticle (Academic Journal)peer-review

7 Citations (Scopus)
359 Downloads (Pure)

Abstract

Ba0.09Al0.18Ti0.12O0.61 glasses have been produced by aerodynamic levitation and laser heating. Neutron diffraction, x-ray diffraction, x-ray absorption spectroscopy, molecular dynamics simulation, and reverse Monte Carlo refinement methods have been used to obtain a detailed atomistic structural model of the glass. This model has been used to investigate its atomic coordination and network structure. It is found that the Al atoms are almost
exclusively fourfold tetrahedrally coordinated to oxygen atoms. In contrast, the Ti atoms coordinate to oxygen atoms in approximately equal numbers of four- and fivefold coordinated sites with a small number of sixfold sites. The results show the presence of some tetrahedral TiO4 structural motifs although the dominant O-Ti-O bond angle occurs at 90◦ . It is found that Al/Ti-O network structure shows strong similarities with other oxide glass forming systems although a first sharp diffraction peak is not observed. The results are used to discuss the unusual properties of the Ba-Al-Ti-O glasses produced under different quenching conditions.
Original languageEnglish
Article number094206
Number of pages15
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume90
Issue number9
Early online date24 Sep 2014
DOIs
Publication statusPublished - 24 Sep 2014

Bibliographical note

Date of Acceptance: 04/08/2015

Keywords

  • Glass beads
  • AERODYNAMIC LEVITATION
  • structure
  • Modelling studies

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