Ferroelectric structure ofandfrom first-principles calculations
- 1 September 1993
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 48 (9), 5910-5918
- https://doi.org/10.1103/physrevb.48.5910
Abstract
Based on the results of total-energy calculations using the full-potential linear muffin-tin orbital method, the equilibrium ground-state structure is determined in perovskite-type and complex oxides. The first compound is found to have a ferroelectric zero-temperature ground state, induced by atomic displacements along [111], as is consistent with the experimentally determined low-temperature crystal structure. The displacements along [001] give rise to another ferroelectric structure which is stable in the constrained tetragonal symmetry; this structure, however, corresponds to a saddle point on a more general path connecting two adjacent [111]-type displacements. was found to be stable in the undistorted cubic phase at zero temperature, exhibiting a soft phonon mode, but it can be driven to a ferroelectric state by negative pressure.
Keywords
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