Ferroelectric Phase Transitions in Ionic Conducting BICUVOX Ceramics

Ceramic solid solutions Bi 4 (V 1 − x Cu x ) 2 O 11 − 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 polymorphou...

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Bibliographic Details
Published in:Ferroelectrics 2009-05, Vol.379 (1), p.35-42
Main Authors: Politova, E. D., Fortalnova, E. A., Poletaeva, N. A., Kaleva, G. M., Mosunov, A. V., Safronenko, M. G., Venskovskii, N. U.
Format: Article
Language:English
Subjects:
77.84.-s
BICUVOX
Ceramics
Dielectric properties
Diffraction
ferroelectric phase transition
Ferroelectrics
Ionic conductivity
Phase transitions
Solid solutions
Spectrum analysis
Temperature effects
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Summary:Ceramic solid solutions Bi 4 (V 1 − x Cu x ) 2 O 11 − 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.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150190902848032