Polarization and Dielectric Properties of BiFeO3-BaTiO3 Superlattice-Structured Ferroelectric Films

Superlattice-structured epitaxial thin films composed of Mn(5%)-doped BiFeO3 and BaTiO3 with a total thickness of 600 perovskite (ABO3) unit cells were grown on single-crystal SrTiO3 substrates by pulsed laser deposition, and their polarization and dielectric properties were investigated. When the l...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2021-07, Vol.11 (7), p.1857
Main Authors: Noguchi, Yuji, Matsuo, Hiroki
Format: Article
Language:English
Subjects:
Approximation
Barium titanates
BaTiO3
BiFeO3
Crystal growth
Crystal structure
Density functional theory
dielectric
Dielectric properties
Electric fields
Electrical properties
Electrodes
ferroelectric
Ferroelectric materials
Ferroelectricity
Ferroelectrics
Lasers
perovskite
Perovskites
Polarization
Pulsed laser deposition
Pulsed lasers
Single crystals
Solid solutions
Strontium titanates
Substrates
Superlattices
Symmetry
Thin films
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Summary:Superlattice-structured epitaxial thin films composed of Mn(5%)-doped BiFeO3 and BaTiO3 with a total thickness of 600 perovskite (ABO3) unit cells were grown on single-crystal SrTiO3 substrates by pulsed laser deposition, and their polarization and dielectric properties were investigated. When the layers of Mn-BiFeO3 and BaTiO3 have over 25 ABO3 unit cells (N), the superlattice can be regarded as a simple series connection of their individual capacitors. The superlattices with an N of 5 or less behave as a unified ferroelectric, where the BaTiO3 and Mn-BiFeO3 layers are structurally and electronically coupled. Density functional theory calculations can explain the behavior of spontaneous polarization for the superlattices in this thin regime. We propose that a superlattice formation comprising two types of perovskite layers with different crystal symmetries opens a path to novel ferroelectrics that cannot be obtained in a solid solution system.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano11071857