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

By S. Fujino, M. Murakami, V. Anbusathaiah, S. Lim, V. Nagarajan, C. Fennie, M. Wuttig, L. Salamanca-Riba, Ichiro Takeuchi. 2008

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We report on the discovery of a lead-free morphotropic phase boundary (MPB) 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 to antiferroelectric transition at approximately Bi0.86Sm0.14FeO3 with dielectric constant and out-of-plane piezoelectric coefficient comparable to those of epitaxial (001) oriented PbZr0.52Ti0.48O3 (PZT) thin films at the MPB. The discovered composition may be a strong candidate of a Pb-free piezoelectric replacement of PZT.

Subfields: Electronic, Optical and Magnetic Materials, Geophysics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/3746b04dec6642d882b262d846ceec369ccf6613