Evolution of domains and thermal hysteresis effects in the pyrochlore-structure ferroelectric Cd2Nb2O7
Н. Н. КолпаковаA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgI. L. Shul’pinaA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgL. Shchepan’skaInstitute of Molecular Physics, Polish Academy of Sciences, Poznan, PolandP. PiskunovichA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg
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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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