Evolution of domains and thermal hysteresis effects in the pyrochlore-structure ferroelectric Cd2Nb2O7

An analysis of the thermally induced domain behavior in Cd2Nb2O7 under cooling and heating in the dark has revealed that below T c the coexistence of ferroelectric-ferroelastic domains of different types is accompanied by irreversible changes in the domains of the previous phase (T c <T<T s ). Interaction of domains with dislocations and other lattice defects causes thermal hysteresis in the phase transition region near T s and T c typical of the “superheated” ferroic state.

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