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Evolving morphotropic phase boundary in lead-free (Bi{sub 1/2}Na{sub 1/2})TiO{sub 3}-BaTiO{sub 3} piezoceramics

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.3530737· OSTI ID:21538029
;  [1];  [2];  [3];  [4];  [5];  [6]
  1. Institute of Materials Science, Technische Universitaet Darmstadt, Petersenstr. 23, Darmstadt 64287 (Germany)
  2. School of Materials Science and Engineering, University of New South Wales, New South Wales 2052 (Australia)
  3. Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611 (United States)
  4. Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011 (United States)
  5. Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom)
  6. Ceramics Laboratory, Swiss Federal Institute of Technology (EPFL), Lausanne CH-1015 (Switzerland)
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The correlation between structure and electrical properties of lead-free (1-x)(Bi{sub 1/2}Na{sub 1/2})TiO{sub 3}-xBaTiO{sub 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.

OSTI ID:
21538029
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 1 Vol. 109; ISSN JAPIAU; ISSN 0021-8979
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACCELERATORS
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CAPACITY
CHALCOGENIDES
COHERENT SCATTERING
CORRELATIONS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CYCLIC ACCELERATORS
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
DIFFRACTION
DISPERSIONS
ELECTRIC FIELDS
ELECTRICAL PROPERTIES
ELECTRICITY
FERROELECTRIC MATERIALS
MATERIALS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PERMITTIVITY
PHYSICAL PROPERTIES
PIEZOELECTRICITY
POLYCRYSTALS
SCATTERING
SODIUM COMPOUNDS
SPACE GROUPS
SYMMETRY GROUPS
SYNCHROTRONS
TETRAGONAL LATTICES
TITANATES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRIGONAL LATTICES