title: Direct measurement of triaxial strain fields around ferroelectric domains using X-ray microdiffraction.
abstract: Ferroelectric materials, such as BaTiO(3), have piezoelectric properties that make them attractive for microelectronic and sensing applications. It is well known that the application of mechanical stress or electric field can alter the domain structure in ferroelectrics. Indeed, the constitutive behaviour of a ferroelectric is largely governed by the formation, movement and interaction of its domains. Therefore, it is crucial that the micromechanics of domains and their effect on internal stresses in ferroelectrics be understood. Here we show that the emerging technique of scanning X-ray microdiffraction can be used to measure directly, for the first time, the local triaxial strain fields around 90 degrees domains in single-crystal BaTiO(3). Specifically, residual strain maps in a region surrounding an isolated, approximately 40 microm wide, 90 degrees domain were obtained with 3 microm resolution, revealing significant residual strains. This information is critical for accurate micromechanical modelling of domain behaviour in ferroelectrics.
authors.affiliation: Department of Materials Science, California Institute of Technology, Keck Laboratory, Pasadena, California 91125, USA.
authors.forename: Robert C
authors.initials: RC
authors.lastname: Rogan
authors.forename: Nobumichi
authors.initials: N
authors.lastname: Tamura
authors.forename: Geoffrey A
authors.initials: GA
authors.lastname: Swift
authors.forename: Ersan
authors.initials: E
authors.lastname: Ustündag
mesh_terms: D017609:Barium Compounds / Q000737:chemistry*; D004548:Elasticity; D004563:Electrochemistry / Q000379:methods; D008422:Materials Testing / Q000379:methods*; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods; D013314:Stress, Mechanical; D014025:Titanium / Q000737:chemistry*; D014159:Transducers; D014961:X-Ray Diffraction / Q000379:methods*
chemical_list: D017609:Barium Compounds; C024547:barium titanate(IV); D014025:Titanium