Effect of Grain Size on Effective Permittivity of Ferroelectric Films Based on Effective Medium Theory

Abstract:

Based on effective medium theory, the temperature dependence of effective dielectric permittivity, ε_e(T), on core radius (a) and thickness (t) of non-ferroelectric dead layer (DL) on the surface of inhomogeneous grains of ferroelectric film made up of cylindrical ferroelectric grains was theoretically investigated. It was found that ε_e(T) increases with increasing core radius but decreases with increasing DL thickness. In this work, an equation expressing the relationship among ε_e, a and t was derived. This equation is very useful for the preparation of a ferroelectric film to desired properties.

• Periodical: Applied Mechanics and Materials (Volume 619)
• Pages: 188-192
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.619.188
• Online since: August 2014
• Authors: Jatuporn Thongsri*
• Keywords: Dielectric Permittivity, Effective Medium Theory, Ferroelectric Film, Grain Size

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