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Barnes, Adrian
University of Bristol
in Cooperation with on an Cooperation-Score of 37%
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article
Structure of Ba-Ti-Al-O glasses produced by aerodynamic levitation and laser heating.
Abstract
Ba<sub>0.09</sub>Al<sub>0.18</sub>Ti<sub>0.12</sub>O<sub>0.61</sub> 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<br/>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 TiO<sub>4</sub> 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.