Dielectric investigations of 0.945(Bi0.5Na0.5) TiO3-0.055BaTiO3

Dielectric properties of 0.945(Bi 0.5 Na 0.5 ) TiO 3 -0.055BaTiO 3 (BNBT5.5) (a composition close to the rhombohedral- tetragonal morphotropic phase boundary) ceramics are studied. It is shown that BNBT5.5 is a relaxor with a characteristic relaxation time that follows Vogel-Fulcher's law. The...

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Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2009-09, Vol.56 (9), p.1831-1834
Main Authors: Greicius, S., Banys, J., Ruzhong Zuo, Granzow, T.
Format: Article
Language:English
Subjects:
Ceramics
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectric properties of solids and liquids
Dielectrics
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Exact sciences and technology
Ferroelectricity and antiferroelectricity
Phase transitions and curie point
Physics
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Summary:Dielectric properties of 0.945(Bi 0.5 Na 0.5 ) TiO 3 -0.055BaTiO 3 (BNBT5.5) (a composition close to the rhombohedral- tetragonal morphotropic phase boundary) ceramics are studied. It is shown that BNBT5.5 is a relaxor with a characteristic relaxation time that follows Vogel-Fulcher's law. The following Vogel-Fulcher parameters of the relaxation time were calculated: pi0 = (2.0 plusmn 2.4)middot10 -14 s, E/ k B = (1620 plusmn 270) K, T 0 = (262 plusmn 9) K.
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2009.1257