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- W3088010526 abstract "The Dion-Jacobson (DJ) family of perovskite-related materials have recently attracted interest due to their polar structures and properties, resulting from hybrid-improper mechanisms for ferroelectricity in n = 2 systems and from proper mechanisms in n = 3 CsBi2Ti2NbO10. We report here a combined experimental and computational study on analogous n = 3 CsLn2Ti2NbO10 (Ln = La, Nd) materials. Density functional theory calculations reveal the shallow energy landscape in these systems and give an understanding of the competing structural models suggested by neutron and electron diffraction studies. The structural disorder resulting from the shallow energy landscape breaks inversion symmetry at a local level, consistent with the observed second-harmonic generation. This study reveals the potential to tune between proper and hybrid-improper mechanisms by composition in the DJ family. The disorder and shallow energy landscape have implications for designing functional materials with properties reliant on competing low-energy phases such as relaxors and antiferroelectrics." @default.
- W3088010526 created "2020-10-01" @default.
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- W3088010526 date "2020-09-22" @default.
- W3088010526 modified "2023-10-11" @default.
- W3088010526 title "Tuning between Proper and Hybrid-Improper Mechanisms for Polar Behavior in Cs<i>Ln</i><sub>2</sub>Ti<sub>2</sub>NbO<sub>10</sub> Dion-Jacobson Phases" @default.
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- W3088010526 doi "https://doi.org/10.1021/acs.chemmater.0c03326" @default.
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