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: tau(0) = (2.0 +/- 2.4) x 10(-14) s, E/B(k) = (1620 +/- 270) K, Tau(0) = (262 +/- 9) K.