Ferroelectric Phase Transitions in Ionic Conducting BICUVOX Ceramicsстатья
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Дата последнего поиска статьи во внешних источниках: 10 июня 2020 г.
Аннотация:Ceramic solid solutions Bi4(V1 − x Cu x )2O11 − y with x = 0 ÷ 0.2, Δx = 0.02, have been prepared by the solid state reactions. The samples were studied by the DTA/DSC, X-ray diffraction and dielectric spectroscopy methods. Concentration and temperature stabilization regions of the polymorphous α, β and γ ′ modifications have been defined. Decreasing of the ferroelectric α-β phase transition temperature, enlargement of the temperature interval of thermal hysteresis while increasing in temperature of the transition between tetragonal γ′ - γ phases have been revealed. Dielectric measurements gave an indication on the effect of the domain walls “pinning” by oxygen vacancies inherent to the bismuth vanadate based compositions.