Polar states of the impurity system KTaO3:Li

Abstract

Linear and nonlinear dielectric and related properties of the polar phases of K 1– x Li x TaO 3 are reviewed for Li + concentrations x = 0.005, 0.011 and 0.063. They range from single particle relaxation with a possible chiral glass transition at T cg ≈ 6 K to the generic glass state below T g ≈ 33 K and to the ferroelectric transition at T C + ≈ 104 K with field controllable internal random field-perturbation.