Joint diffraction and modeling approach to the structure of liquid alumina

SKINNER, Lawrie B., BARNES, Adrian C., SALMON, Philip S., HENNET, Louis, FISCHER, Henry E., BENMORE, Chris J., KOHARA, Shinji, WEBER, J. K. Richard, BYTCHKOV, Aleksei, WILDING, Martin, PARISE, John B., FARMER, Thomas O., POZDNYAKOVA, Irina, TUMBER, Sonia K. and OHARA, Koji (2013). Joint diffraction and modeling approach to the structure of liquid alumina. Physical Review B (PRB), 87 (2), 024201.

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The structure of liquid alumina at a temperature ∼2400 K near its melting point was measured using neutron and high-energy x-ray diffraction by employing containerless aerodynamic–levitation and laser-heating techniques. The measured diffraction patterns were compared to those calculated from molecular dynamics simulations using a variety of pair potentials, and the model found to be in best agreement with experiments was refined using the reverse Monte Carlo method. The resultant model shows that the melt is composed predominantly of AlO4 and AlO5 units, in the approximate ratio of 2:1, with only minor fractions of AlO3 and AlO6 units. The majority of Al-O-Al connections involve corner-sharing polyhedra (83%), although a significant minority involve edge-sharing polyhedra (16%), predominantly between AlO5 and either AlO5 or AlO4 units. Most of the oxygen atoms (81%) are shared among three or more polyhedra, and the majority of these oxygen atoms are triply shared among one or two AlO4 units and two or one AlO5 units, consistent with the abundance of these polyhedra in the melt and their fairly uniform spatial distribution.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Engineering Research
Departments - Does NOT include content added after October 2018: Faculty of Science, Technology and Arts > Department of Engineering and Mathematics
Identification Number:
Page Range: 024201
Depositing User: Martin Wilding
Date Deposited: 27 Jun 2018 09:15
Last Modified: 18 Mar 2021 11:46

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