Issue 6, 2020

Phase stability of the layered oxide, Ca2Mn3O8; probing interlayer shearing at high pressure

Abstract

We have performed high-pressure neutron diffraction studies on the layered oxide, Ca2Mn3O8. Studies up to approximately 6 GPa at temperatures of 120 and 290 K demonstrate that there are no structural phase transitions within this pressure range. Fits of the unit-cell volume to a Birch-Murngahan equation of state gives values for the bulk modulus of 137(2) GPa and 130(2) GPa at temperatures of 290 K and 120 K respectively possibly suggesting that Ca2Mn3O8 is more compressible at lower temperature. Furthermore, compression along the principal axes are anisotropic on the local scale. Comparison of individual bond lengths and bond angle environments further demonstrate that compression is complex and likely results in a shearing of the layers.

Graphical abstract: Phase stability of the layered oxide, Ca2Mn3O8; probing interlayer shearing at high pressure

Supplementary files

Article information

Article type
Paper
Submitted
29 Jun 2020
Accepted
02 Aug 2020
First published
05 Aug 2020
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2020,1, 1841-1848

Phase stability of the layered oxide, Ca2Mn3O8; probing interlayer shearing at high pressure

L. J. Vera Stimpson, K. J. W. Etherdo-Sibley, C. J. Ridley, C. L. Bull and D. C. Arnold, Mater. Adv., 2020, 1, 1841 DOI: 10.1039/D0MA00464B

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