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American Mineralogist; May 2007; v. 92; no. 5-6; p. 748-752; DOI: 10.2138/am.2007.2456
© 2007 Mineralogical Society of America
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Tilt and buckling modes, and acoustic anisotropy in layers with post-perovskite connectivity

Ian P. Swainson* and André L. Yonkeu

Canadian Neutron Beam Centre, National Research Council of Canada, Station 18, Chalk River Laboratories, Chalk River, Ontario, K0J 1J0, Canada

Correspondence: * E-mail: ian.swainson{at}nrc.gc.ca

The effect of the anisotropic connectivity within the layers of the post-perovskite, CaIrO3, structure are examined using a Rigid Unit Mode and group theory approach, and possible commensurate tilt structures are given. It is shown that the anisotropic bonding of the sheet may give rise to preferred directions of buckling for such structures and anisotropy in the speed of sound.

Key Words: Post-perovskite • CaIrO3 • tilt modes • layer structures • buckling modes • acoustic anisotropy






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