Lamellar and bundled domain rotations in barium titanate

Published

August 27, 2018

Author(s)

Jane A. Howell, Mark D. Vaudin, Lawrence Henry Friedman, Robert F. Cook

Abstract

Cross-correlation of electron backscatter diffraction patterns has been used to generate rotation maps of single crystals of tetragonal barium titanate (BaTiO3) containing multiple lamellae and bundles of  90 domains. Rotation measurement angular resolutions of 0.1 mrad (0.006) and spatial resolutions of 30 nm are demonstrated on structures with approximately 1 m domains extending over 10s of m. The measurements demonstrated considerable microstructural dependence: c domains, with polarization perpendicular to a free surface, exhibited little within-domain rotation variation while a domains, with polarization parallel to the surface, exhibited considerable within-domain variation, particularly in the larger lamellar domain structure. In both lamellar and bundled structures, the maximum a-c between- domain rotation was approximately equal to the value r  0.63 ( 11 mrad) predicted by a rigid rotation of tetragonal BaTiO3 unit cells across the domain boundary. However, in both structures there was gradual variation in rotation throughout, especially adjacent to domain boundaries, suggesting that a rigid rotation model predicts too abrupt a unit cell and polarization rotation. A new BaTiO3 compound defect was identified through association with a double integral surface rotation 2r. The double rotation is indicative of a low-angle grain boundary terminating at a surface by a confined 90 domain.

Citation

Journal of Materials Science

Pub Type

Journals

Keywords

electron backscatter diffraction, barium titanate, rotation, domain

Citation

Howell, J. , Vaudin, M. , Friedman, L. and Cook, R. (2018), Lamellar and bundled domain rotations in barium titanate, Journal of Materials Science (Accessed December 10, 2024)