Abstract
The electrochemical response of ferroelectric PbZr0.52Ti0.48O3 (PZT) films in 1 N H2SO4 is investigated for films with thicknesses of 50–360 nm. A microdroplet cell is used to spatially differentiate a continuous electrode response from a porous electrode response. Cyclic voltammetry and impedance spectroscopy confirm the continuity of the films at a majority of test sites, indicating a response typical of a Pt-PZT-Pt capacitor. For films less than 150 nm in thickness, ionic coupling across the ferroelectric-solution interface promotes electrochemical hysteresis, allowing the ferroelectric-solution interface to be switched between two different charge states at a given electrode potential. Sites that exhibit a porous electrode response, however, are subject to chemical attack when an electron source, such as hydrogen, is present. A Pourbaix diagram for PZT is derived to explain these results and predict phase stability in reducing environments.
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