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American Institute of Physics, Journal of Applied Physics, 1(109), p. 014110

DOI: 10.1063/1.3530737

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Evolving morphotropic phase boundary in lead-free (Bi1/2Na1/2)TiO3–BaTiO3 piezoceramics

Journal article published in 2011 by Wook Jo, Tan Xiaoli, Rö del Jürgen, John E. Daniels ORCID, Jacob L. Jones ORCID, Pam A. Thomas, Dragan Damjanovic, Jürgen Rödel ORCID
This paper is available in a repository.
This paper is available in a repository.

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Abstract

The correlation between structure and electrical properties of lead-free (1-x)(Bi(1/2)Na(1/2))TiO(3)-xBaTiO(3) (BNT-100xBT) polycrystalline piezoceramics was investigated systematically by in situ synchrotron diffraction technique, combined with electrical property characterization. It was found that the morphotropic phase boundary (MPB) between a rhombohedral and a tetragonal phase evolved into a morphotropic phase region with electric field. In the unpoled material, the MPB was positioned at the transition from space group R3m to P4mm (BNT-11BT) with optimized permittivity throughout a broad single-phase R3m composition regime. Upon poling, a range of compositions from BNT-6BT to BNT-11BT became two-phase mixture, and maximum piezoelectric coefficient was observed in BNT-7BT. It was shown that optimized electrical properties are related primarily to the capacity for domain texturing and not to phase coexistence.