Roy, Amritendu and Prasad, Rajendra and Auluck, Sushil and Garg, Ashish
(2014)
Optical anisotropy in bismuth titanate: An experimental and theoretical study.
Journal of Applied Physics, 115 (13).
ISSN 0021-8979
Abstract
We report experimental and theoretical investigation of anisotropy in optical properties and their origin in the ferroelectric and paraelectric phases of bismuth titanate. Room temperature ellipsometric measurements performed on pulsed laser deposited bismuth titanate thin films of different orientations show anisotropy in the dielectric and optical constants. Subsequent first-principles calculations performed on the ground state structures of ferroelectric and high temperature paraelectric phases of bismuth titanate show that the material demonstrates anisotropic optical behavior in both ferroelectric and paraelectric phases. We further show that O 2p to Ti 3d transition is the primary origin of optical property of the material while optical anisotropy results from the asymmetrically oriented Ti-O bonds in TiO6 octahedra in the unit cell.
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