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Strain Evolution of Highly Asymmetric Polycrystalline Ferroelectric Ceramics via a Self‐Consistent Model and In Situ X‐Ray Diffraction

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Strain and texture evolution (domain switching) of polycrystalline, ferroelectric BaTiO3 was investigated in four‐point bending geometry. Lattice strains were measured by in situ synchrotron X‐ray diffraction to address problems related to modeling the constitutive behavior of highly asymmetric ferroelectrics. The hkl‐dependent strain measured by X‐ray diffraction was found to be smaller relative to both bulk strain measured by conventional, contact‐based techniques and elastically computed strain, and reasons for this inconsistency are discussed. A self‐consistent model with capabilities of quantifying domain switching and estimating hkl‐dependent strain is applied to allow a direct comparison with diffraction data.
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Document Type: Research Article

Publication date: 2012-12-01

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