alexa Strain Engineered CaBi2Nb2O9 Thin Films with Enhanced Electrical Properties.
Materials Science

Materials Science

Journal of Nanomedicine & Nanotechnology

Author(s): Zhang Y, , Ouyang J, , ,

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Abstract In this work, strain engineered polycrystalline thin films (∼250 nm) of bismuth layer-structured ferroelectric (BLSF) CaBi2Nb2O9 (CBNO) were prepared by using a radio frequency (RF) magnetron sputtering technique. XRD analysis revealed that the films were (200)/(020) and (00l) textured with a large in-plane tensile stress. Cross-sectional TEM analyses confirmed the bismuth layered-structure, as well as crystalline orientations and a strain-controlled growth mode of the grains. Result of a quantitative XPS analysis revealed that the composition of the film is close to the chemical stoichiometry. Excellent electrical properties were achieved in the CBNO films, including a high dielectric constant (∼280 @5 kHz), a small dielectric loss (tgδ ≤ 1.6\% up to an applied electric field of ∼1200 kV/cm) and a large polarization (Pr ≈ 14 μC/cm(2) @ 1 kHz). This article was published in ACS Appl Mater Interfaces and referenced in Journal of Nanomedicine & Nanotechnology

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