Combinatorial discovery of a lead-free morphotropic phase boundary in a thin-film piezoelectric perovskite

S. Fujino , M. Murakami , A. Varatharajan , S.-H. Lim , V. Nagarajan , C. J. Fennie , M. Wuttig , L. Salamanca-Riba

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I. Takeuchi

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classification ❄️ cond-mat.mtrl-sci

keywords boundarypiezoelectriccombinatorialdiscoverylead-freemorphotropicperovskitephase

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We report on the discovery of a lead-free morphotropic phase boundary in Sm doped BiFeO3 with a simple perovskite structure using the combinatorial thin film strategy. The boundary is a rhombohedral to pseudo-orthorhombic structural transition which exhibits a ferroelectric (FE) to antiferroelectric (AFE) transition at approximately Bi0.86Sm0.14FeO3 with dielectric constant and out-of-plane piezoelectric coefficient comparable to those of epitaxial (001) oriented Pb(Zr,Ti)O3 (PZT) thin films at the MPB. The discovered composition may be a strong candidate of a Pb-free piezoelectric replacement of PZT.

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Combinatorial discovery of a lead-free morphotropic phase boundary in a thin-film piezoelectric perovskite

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