Study of the ferroelectricity in Bi2Ti2O7 by infrared spectroscopic ellipsometry
Authors:
- 14 March 2005
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 86 (11) , 112905
Abstract
Using infrared spectroscopic ellipsometry, the dielectric functions of (111) oriented Bi 2 Ti 2 O 7 thin films with pyrochlore structure prepared on Pt ∕ Ti ∕ SiO 2 ∕ Si substrate were determined in the temperature range of 20–70 °C. It is demonstrated that there is a phase transition that appears near 40 °C in terms of static effective charge as a function of temperature calculated from the infrared spectroscopic ellipsometric data of Bi 2 Ti 2 O 7 thin films. It suggests that the static effective charge is related to the structural distortion, which can facilitate the polarization of Bi 2 Ti 2 O 7 . Accordingly, ferroelectricity in Bi 2 Ti 2 O 7 is proved by analyzing the infrared dielectric function.Keywords
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