Giant dielectric relaxation in SrTiO3-SrMg1/3Nb2/3O3 and SrTiO3-SrSc1/2Ta1/2O3 solid solutions

Dielectric relaxation induced internal electric field and its effect on magnetoelectric state in Co4Nb2O9

“…The orderly orientated dipoles yield a local internal field E Int oppositely directed to the applied field. This internal field, as estimated by Lorentz model, can be written as E Int = (2 + ε ∞ ) E /3 . According to the results reported in Ref.…”

Dielectric relaxation and localized electron hopping in colossal dielectric (Nb,In)-doped TiO2 rutile nanoceramics

“…One can find from eqn (2) that the smaller values of E a and t 0 should result in a fast relaxation process at a fixed temperature, so that the hopping type of relaxations have been observed at low temperature (T o 100 K) with a frequency range of less than 10 6 Hz. [33][34][35][36] In our case, the characteristic time constant t exponentially became faster (smaller) as the temperature increased, and then it reached t B 6 Â 10 À8 s at 30 K, which corresponds to f r 4 2 Â 10 6 Hz. Hence, relaxation was not clearly observed in the measured frequency range above 30 K in Fig.…”

Reasons for the High Electrical Conductivity of Bismuth Ferrite and Ways to Minimize It

“…Moreover, the increase in dielectric permittivity is always due to the electrical conductivity of the components (crystallites) of a heterogeneous dielectric [27,28]. In experimental works [29][30][31], a gigantic increase in the permittivity is associated with relaxation polarization processes. In works [31,32] an analysis of the growth of the low-frequency permittivity of a heterogeneous dielectric, which is a randomly inhomogeneous object, is made using finite elements and Monte Carlo methods.…”