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 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.