Structural investigation of LaAlO3 up to 63 GPa

Details Structural investigation of LaAlO3 up to 63 GPa Structural investigation of LaAlO3 up to 63 GPa

2011-05-06

arxiv.org/abs/1105.1276v2

J. Phys.: Condens. Matter 23 (2011) 395401

Physics

Condensed Matter

Materials Science

10 pages, 4 figures, 2 tables

Scientific paper

10.1088/0953-8984/23/39/395401

We report a high-pressure single-crystal synchrotron x-ray diffraction on a LaAlO3 single crystal. The transition from rhombohedral to cubic at 14.8 GPa is confirmed by the loss of the superstructure reflections, whose intensity shows a linear pressure dependence, characteristic of a second-order transition. The crystal remains cubic up to 63 GPa, the highest pressure reached, which provides a confirmation over a very large pressure range of the general rules for the evolution of distortions of perovskites under pressure. We give the parameters of Birch-Murnaghan equations of state in the low- and high-pressure phases and discuss the evolution of the bulk modulus.

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