Evolving morphotropic phase boundary in lead-free (Bi1/2Na 1/2)TiO3-BaTiO3 piezoceramics
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- Evolving morphotropic phase boundary in lead-free (Bi1/2Na 1/2)TiO3-BaTiO3 piezoceramics
- Jo, Wook; Daniels, John E.; Jones, Jacob L.; Tan, Xiaoli; Thomas, Pamela A.; Damjanovic, Dragan; Roedel, Juergen
- Electrical property; Electrical property characterization; In-situ synchrotrons; Lead-Free; Morphotropic phase boundaries; Phase co-existence; Phase region; Piezo-ceramics; Piezoelectric coefficient; Polycrystalline; Space Groups; Tetragonal phase; TiO; Two phase mixtures
- Issue Date
- AMER INST PHYSICS
- JOURNAL OF APPLIED PHYSICS, v.109, no.1, pp. -
- The correlation between structure and electrical properties of lead-free (1-x)(Bi1/2Na1/2)TiO3-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.
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