Phase transitions, phase coexistence, and piezoelectric switching behavior in highly strained BiFeO(3) films.

Beekman, C; Siemons, W; Ward, T Z; Chi, M; Howe, J; Biegalski, M D; Balke, N; Maksymovych, P et al. · Adv Mater · 2013

basic_science · Level V

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Abstract

Highly strained BiFeO3 films transition into a true tetragonal state at 430 °C but remain polar to much higher temperatures (∼800 °C). Piezoelectric switching is only possible up to 300 °C, i.e., at temperatures for which strain stabilizes the stripe-like coexistence of multiple polymorphs.