First-principles investigation of ferroelectricity in perovskite compounds

TY - JOUR

T1 - First-principles investigation of ferroelectricity in perovskite compounds

AU - King-Smith, R. D.

AU - Vanderbilt, David

PY - 1994

Y1 - 1994

N2 - We have used a first-principles ultra-soft-pseudopotential method in conjunction with an efficient preconditioned conjugate-gradient scheme to investigate the properties of a series of eight cubic perovskite compounds. The materials considered in this study are BaTiO3, SrTiO3, CaTiO3, KNbO3, NaNbO3 PbTiO3, PbZrO3, and BaZrO3. We computed the total-energy surface for zone-center distortions correct to fourth order in the soft-mode displacement, including renormalizations due to strain coupling. Quantities calculated for each material include lattice constants, elastic constants, zone-center phonon frequencies, Grüneisen parameters, and band structures. Our calculations correctly predict the symmetry of the ground-state structures of all compounds whose observed low-temperature structure retains a primitive five-atom unit cell. The database of results we have generated shows a number of trends which can be understood using simple chemical ideas based on the sizes of ions, and the frustration inherent in the cubic perovskite structure.

AB - We have used a first-principles ultra-soft-pseudopotential method in conjunction with an efficient preconditioned conjugate-gradient scheme to investigate the properties of a series of eight cubic perovskite compounds. The materials considered in this study are BaTiO3, SrTiO3, CaTiO3, KNbO3, NaNbO3 PbTiO3, PbZrO3, and BaZrO3. We computed the total-energy surface for zone-center distortions correct to fourth order in the soft-mode displacement, including renormalizations due to strain coupling. Quantities calculated for each material include lattice constants, elastic constants, zone-center phonon frequencies, Grüneisen parameters, and band structures. Our calculations correctly predict the symmetry of the ground-state structures of all compounds whose observed low-temperature structure retains a primitive five-atom unit cell. The database of results we have generated shows a number of trends which can be understood using simple chemical ideas based on the sizes of ions, and the frustration inherent in the cubic perovskite structure.

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U2 - https://doi.org/10.1103/PhysRevB.49.5828

DO - https://doi.org/10.1103/PhysRevB.49.5828

M3 - Article

VL - 49

SP - 5828

EP - 5844

JO - Physical Review B

JF - Physical Review B

SN - 0163-1829

IS - 9

ER -