Frequency and temperature-dependence of dielectric permittivity and electric modulus studies of the solid solution Ca 0.85 Er 0.1 Ti 1−x Co 4x/3 O 3 (0 ≤ x ≤ 0.1)

) confirmed that the relaxation process is thermally activated. The normalized imaginary part of the modulus indicated that the relaxation process is dominated by the short range movement of charge carriers.