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American Mineralogist; November 2004; v. 89; no. 11-12; p. 1667-1672
© 2004 Mineralogical Society of America
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Isosymmetric structural phase transition of orthoenstatite: Molecular dynamics simulation

Akira Miyake*, Norimasa Shimobayashi and Masao Kitamura

Department of Geology and Mineralogy, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan

Correspondence: * E-mail: miya{at}kueps.kyoto-u.ac.jp

An isosymmetric phase transition from orthoenstatite to a new high-temperature orthorhombic phase of enstatite was observed at about 1230 K in molecular dynamics (MD) simulations for the Mg end-member composition, Mg2Si2O6. This new phase has the same space group as orthoenstatite, Pbca. The discontinuous changes of the cell volume and cell parameters during the transition indicate a first-order transition. The transition is characterized by the switching of bonds between Mg atoms at the M2 sites and the coordinated O3 atoms. This new phase corresponds to the high-temperature state of enstatite observed in the in situ high-temperature X-ray studies and probably to orthopyroxene appearing in the phase diagram of the quadrilateral pyroxenes, indicating the possibility of its existence as a stable phase at high temperature.




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