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

Authors :: Fujino, S.
Murakami, M.
Anbusathaiah, V.
Lim, S.-H.
Nagarajan, V.
Fennie, C. J.
Wuttig, M.
Salamanca-Riba, L.
Takeuchi, I.
Source :: Applied Physics Letters; 5/19/2008, Vol. 92 Issue 20, p202904, 3p, 1 Diagram, 3 Graphs
Publication Year :: 2008
Abstract: We report on the discovery of a lead-free morphotropic phase boundary (MPB) in Sm doped BiFeO<subscript>3</subscript> 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 Bi<subscript>0.86</subscript>Sm<subscript>0.14</subscript>FeO<subscript>3</subscript> with dielectric constant and out-of-plane piezoelectric coefficient comparable to those of epitaxial (001) oriented PbZr<subscript>0.52</subscript>Ti<subscript>0.48</subscript>O<subscript>3</subscript> (PZT) thin films at the MPB. The discovered composition may be a strong candidate of a Pb-free piezoelectric replacement of PZT. [ABSTRACT FROM AUTHOR]

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