Point defect induced incommensurate dipole moments in the KCa2Nb3O10 Dion-Jacobson layered perovskite

KONG, J., NAYAK, S.K., CO, K., NAYAK, S., WU, J., FETEIRA, Antonio, BEYER, K.A., ALPAY, S.P. and PRAMANICK, A. (2021). Point defect induced incommensurate dipole moments in the KCa2Nb3O10 Dion-Jacobson layered perovskite. Physical Review B, 104 (22).

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Link to published version:: https://doi.org/10.1103/PhysRevB.104.224104


Local structural distortions due to isolated atomic defects and defect complexes strongly affect the macroscopic properties of oxide ceramics. While the characterization of local defect structures is more common in simple ABO3 perovskites, unambiguous determination of the same in layered perovskites is more difficult due to their complex crystal structures. Here, we combined x-ray pair distribution function and density functional theory calculations to characterize the structure of cation-oxygen divacancy pairs in a Dion-Jacobson (D-J) layered perovskite. Our results indicate that local incommensurate dipole moments with polarization density in the range of ∼0.1–17μC/cm2 are created due to divacancy-induced structural distortions in the D-J phase KCa2Nb3O10. This is comparable with defect dipole moments observed in well-known perovskite ferroelectrics. The current results imply that controlling the atomic defects can potentially lead to significant control of dielectric properties in D-J layered perovskites.

Item Type: Article
Identification Number: https://doi.org/10.1103/PhysRevB.104.224104
SWORD Depositor: Symplectic Elements
Depositing User: Symplectic Elements
Date Deposited: 25 Feb 2022 14:42
Last Modified: 25 Feb 2022 14:45
URI: https://shura.shu.ac.uk/id/eprint/29822

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