Joint diffraction and modeling approach to the structure of liquid alumina

L.B. Skinner, A.C. Barnes, P.S. Salmon, T.O. Farmer, J.B. Parise, C.J. Benmore, J.K.R. Weber, S.K. Tumber, L. Hennet, I. Pozdnyakova, H.E. Fischer, S. Kohara, K. Ohara, A. Bytchkov, M.C. Wilding

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Abstract

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 AlO and AlO units, in the approximate ratio of 2:1, with only minor fractions of AlO and AlO units. The majority of Al-O-Al connections involve corner-sharing polyhedra (83%), although a significant minority involve edge-sharing polyhedra (16%), predominantly between AlO and either AlO or AlO 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 AlO units and two or one AlO units, consistent with the abundance of these polyhedra in the melt and their fairly uniform spatial distribution.
Original languageEnglish
Article number024201
JournalPhysical Review B
Volume87
Issue number2
DOIs
Publication statusPublished - 3 Jan 2013

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Aluminum Oxide
polyhedrons
Alumina
aluminum oxides
Diffraction
Oxygen
Laser heating
Atoms
Liquids
liquids
diffraction
Diffraction patterns
Spatial distribution
Melting point
Molecular dynamics
oxygen atoms
Aerodynamics
Neutrons
Monte Carlo methods
X rays

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Skinner, L. B., Barnes, A. C., Salmon, P. S., Farmer, T. O., Parise, J. B., Benmore, C. J., ... Wilding, M. C. (2013). Joint diffraction and modeling approach to the structure of liquid alumina. Physical Review B, 87(2), [024201]. https://doi.org/10.1103/PhysRevB.87.024201

Joint diffraction and modeling approach to the structure of liquid alumina. / Skinner, L.B.; Barnes, A.C.; Salmon, P.S.; Farmer, T.O.; Parise, J.B.; Benmore, C.J.; Weber, J.K.R.; Tumber, S.K.; Hennet, L.; Pozdnyakova, I.; Fischer, H.E.; Kohara, S.; Ohara, K.; Bytchkov, A.; Wilding, M.C.

In: Physical Review B, Vol. 87, No. 2, 024201, 03.01.2013.

Research output: Contribution to journalArticle

Skinner, LB, Barnes, AC, Salmon, PS, Farmer, TO, Parise, JB, Benmore, CJ, Weber, JKR, Tumber, SK, Hennet, L, Pozdnyakova, I, Fischer, HE, Kohara, S, Ohara, K, Bytchkov, A & Wilding, MC 2013, 'Joint diffraction and modeling approach to the structure of liquid alumina', Physical Review B, vol. 87, no. 2, 024201. https://doi.org/10.1103/PhysRevB.87.024201
Skinner, L.B. ; Barnes, A.C. ; Salmon, P.S. ; Farmer, T.O. ; Parise, J.B. ; Benmore, C.J. ; Weber, J.K.R. ; Tumber, S.K. ; Hennet, L. ; Pozdnyakova, I. ; Fischer, H.E. ; Kohara, S. ; Ohara, K. ; Bytchkov, A. ; Wilding, M.C. / Joint diffraction and modeling approach to the structure of liquid alumina. In: Physical Review B. 2013 ; Vol. 87, No. 2.
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