Polar relaxation mode in pure and iron-doped barium titanate

A dielectric relaxation peak is reported in BaTiO3 and in BaTi1-xFexO3. It is nearly monodispersive, centered in the 108-Hz range, and slowest at the transition temperature Tc 413 K from the cubic to the tetragonal phase. Iron doping lowers Tc and slows down this relaxation mode. © 1989 The American Physical Society.