Non-Debye dielectric dispersion of barium titanate stannate in the relaxor and diffuse phase-transition state

Frequency dependence T-m(f ) of the permittivity maximum temperature observed in BaTi(1-x)Sn(x)0(3), x=0.2 (BTS20), confirms that this composition is close above threshold x(c) for relaxor behavior in BTS. The low-frequency permittivity carries a ln(1/f )-frequency dependence in the vicinity of T-m, both for x=0.2 and x=0.125