Structural investigation of LaAlO3 up to 63 GPa

Abstract

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.

10 pages, 4 figures, 2 tables

References in corpus (2)

• Pressure-temperature phase diagram of SrTiO3 up to 53 GPa
• Phase transitions and ferroelectrics: revival and the future in the field

Cited by in corpus (3)

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• Lattice dynamics and Raman spectrum of BaZrO3 single crystals
• A Strategy to Identify Materials Exhibiting a Large Nonlinear Phononics Response: Tuning the Ultrafast Structural Response of LaAlO${}_3$ with Pressure