Long ranged structural modulation in the pre-morphotropic phase boundary cubic-like state of the lead-free piezoelectric Na{sub 1/2}Bi{sub 1/2}TiO{sub 3}-BaTiO{sub 3}

Journal Article · Sat Dec 21 04:00:00 EST 2013 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4842855· OSTI ID:22266197

Garg, Rohini; Narayana Rao, Badari; Ranjan, Rajeev ^[1]; Senyshyn, Anatoliy ^[2]

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1. Department of Materials Engineering, Indian Institute of Science, Bangalore 560012 (India)
2. Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universität München, Lichtenbergestrasse 1, D-85747 Garching b. München (Germany)

The nature of the pre-morphotropic phase boundary (MPB) cubic-like state in the lead-free piezoelectric ceramics (1−x)Na{sub 1/2}Bi{sub 1/2}TiO{sub 3}-(x)BaTiO{sub 3} at x ∼ 0.06 has been examined in detail by electric field and temperature dependent neutron diffraction, x-ray diffraction, dielectric and ferroelectric characterization. The superlattice reflections in the neutron diffraction patterns cannot be explained with the tetragonal P4bm and the rhombohedral (R3c) phase coexistence model. The cubic like state is rather a result of long ranged modulated complex octahedral tilt. This modulated structure exhibits anomalously large dielectric dispersion. The modulated structure transforms to a MPB state on poling. The field-stabilized MPB state is destroyed and the modulated structure is restored on heating the poled specimen above the Vogel-Fulcher freezing temperature. The results show the predominant role of competing octahedral tilts in determining the nature of structural and polar states in Na{sub 1/2}Bi{sub 1/2}TiO{sub 3}-based ferroelectrics.

• OSTI ID: 22266197
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 23 Vol. 114; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CERAMICS
COMPLEXES
DISPERSIONS
ELECTRIC FIELDS
FERROELECTRIC MATERIALS
FREEZING
HEATING
MODULATION
NEUTRON DIFFRACTION
PIEZOELECTRICITY
REFLECTION
SUPERLATTICES
TEMPERATURE DEPENDENCE
TETRAGONAL LATTICES
TITANATES
TRIGONAL LATTICES
X-RAY DIFFRACTION