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Jo, Wook
Sustainable Functional Ceramics Lab
Research Interests
  • Lead-free piezoceramics, ultra - low temperature sintering, ferroelectrics, relaxor ferroelectrics, 2D materials, magnetoelectric materials, multiferroics

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Evolving morphotropic phase boundary in lead-free (Bi1/2Na 1/2)TiO3-BaTiO3 piezoceramics

Cited 117 times inthomson ciCited 94 times inthomson ci
Title
Evolving morphotropic phase boundary in lead-free (Bi1/2Na 1/2)TiO3-BaTiO3 piezoceramics
Author
Jo, WookDaniels, John E.Jones, Jacob L.Tan, XiaoliThomas, Pamela A.Damjanovic, DraganRoedel, Juergen
Keywords
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
2011-01
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v.109, no.1, pp. -
Abstract
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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DOI
10.1063/1.3530737
ISSN
0021-8979
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MSE_Journal Papers
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