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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2010

Low-symmetry phases and loss of relaxation in nanosized lead scandium niobate

Résumé

Using a combination of experimental and theoretical techniques, we reveal that lead scandium niobate (PSN) nanograins exhibit a critical size of approximate to 65 nm below which the ground state is not anymore rhombohedral but rather monoclinic for chemically disordered systems. A triclinic ground state is further found for chemically ordered nanosized PSN. Such changes in symmetry are associated with a change in the polarization's direction, as well as, with an enhancement of the polarization's magnitude and a vanishing of relaxation. First-principles-based calculations point toward an internal electric field and mechanical constraints for the origins of these unexpected features.
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hal-00583381 , version 1 (05-04-2011)

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Jean-Michel Kiat, Christine Bogicevic, Fabienne Karolak, G. Dezanneau, N. Guiblin, et al.. Low-symmetry phases and loss of relaxation in nanosized lead scandium niobate. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2010, 81 (14), pp.144122. ⟨10.1103/PhysRevB.81.144122⟩. ⟨hal-00583381⟩
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