High temperature lead-free relaxor ferroelectric: Intergrowth Aurivillius phase BaBi{sub 2}Nb{sub 2}O{sub 9}-Bi{sub 4}Ti{sub 3}O{sub 12} ceramics

Journal Article · Sat May 15 00:00:00 EDT 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3380847· OSTI ID:21476264

Hongtao, Zhang ^[1]; Haixue, Yan; Reece, Michael J ^[1]

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1. School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS (United Kingdom)

Intergrowth BaBi{sub 2}Nb{sub 2}O{sub 9}-Bi{sub 4}Ti{sub 3}O{sub 12} (BaBi{sub 6}Ti{sub 3}Nb{sub 2}O{sub 21}) Aurivillius phase ceramic has been found to be a relaxor ferroelectric (RFE) with the highest reported temperature of the maximum of the dielectric permittivity (T{sub m}) of all of the known RFE systems. Dielectric characterization revealed that it has two dielectric anomalies. The first one is a frequency independent broad dielectric constant peak at {approx}280 deg. C, while the second anomaly shows relaxor behavior at 636 deg. C (100 kHz). There is obvious frequency dispersion of dielectric response at room temperature, which is in agreement with dielectric properties of a typical relaxor. Ferroelectric hysteresis loops and a measurable value of piezoelectric constant d{sub 33} confirmed the ferroelectric nature of BaBi{sub 6}Ti{sub 3}Nb{sub 2}O{sub 21} ceramics. The piezoelectric response remained even after annealing at temperatures above 636 deg. C.

• OSTI ID: 21476264
• Journal Information: Journal of Applied Physics, Vol. 107, Issue 10; Other Information: DOI: 10.1063/1.3380847; (c) 2010 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANNEALING
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CERAMICS
FERROELECTRIC MATERIALS
FREQUENCY DEPENDENCE
HYSTERESIS
KHZ RANGE
NIOBATES
PERMITTIVITY
PIEZOELECTRICITY
TITANATES
ALKALINE EARTH METAL COMPOUNDS
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
ELECTRICAL PROPERTIES
ELECTRICITY
FREQUENCY RANGE
HEAT TREATMENTS
MATERIALS
NIOBIUM COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS