High pressure study of ScAlO3 perovskite |
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Authors: | Nancy L Ross |
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Institution: | (1) Research School of Geological and Geophysical Sciences, University College London, Gower Street, London WC1E 6BT Fax: +44 171-388-7614, e-mail: n.ross@ucl.ac.uk, |
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Abstract: | The crystal structure of orthorhombic (Pbnm) ScAlO3 perovskite has been refined to 5 GPa using single-crystal X-ray diffraction. The compression of the structure if anisotropic
with β
a
=1.39(3)×10−3 GPa−1, β
b
=1.14(3)×10−3 GPa−1 and β
c
=1.84(3)×10−3 GPa−1. The isothermal bulk modulus of ScAlO3, K
T
, determined from fitting a Birch-Murnaghan equation of state (K
′
T
=4) to the volume compression data is 218(1) GPa. The interoctahedral angles to not vary significantly with pressure, and
the compression of the structure is entirely attributable to compression of the AlO6 octahedra. The compressibilities of the constituent AlO6 and ScO12 are well matched: βAl−O=1.6×10−3 GPa−1 and βSc−O=1.5×10−3 GPa−1. Therefore the distortion of the structure shows no significant change with increasing pressure.
Received: 18 August 1997 / Revised, accepted: 11 November 1997 |
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Keywords: | |
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