期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 23, 期 39, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/23/39/395401
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资金
- French National Research Agency (ANR)
We report a high-pressure 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 report the parameters of the Birch-Murnaghan equations of state in the low- and high-pressure phases and discuss the evolution of the bulk modulus.
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