Ferroelectrics · 1998 · 95 citations · 16 references
Natural SciencesMaterials SciencePhysicsCeramic MaterialsCeramicsSolid State PhysicsDielectric CeramicsDielectric PropertiesDielectricsElectrical Properties Of CeramicsFerroelectric CeramicsFerroelectric MaterialsDielectric DispersionDipolar RelaxationElectro-mechanical CouplingExternal ActionFerroelectric PropertiesHysteresisHysteresis LoopsPermittivity
Abstract The dielectric dispersion and influence of a.c. electric field strength on electric permittivity as well as the hysteresis loops for Na0.5Bi0.5TiO3 ceramics were investigated. The dipolar relaxation of Cole—Cole type below 1 MHz is observed. This relaxation significantly evolves with temperature and is connected with dynamics of polar regions. The increasing strength of a.c. electric field shifts the electric permittivity characteristic towards lower temperatures. This effect can be associated with the reactivation and reversal of the polar regions and mechanical stresses rising because of external field action. Examination of the low-frequency hysteresis loops reveals the occurrence of usual ferroelectric properties below 200°C. The occurrence of deformed hysteresis loops above 200°C is discussed in terms of electro-mechanical interaction between polar regions and nonpolar matrix. Key Words: Sodium-bismuth titanate ceramicdielectric dispersionhysteresis loopseffect of a.c. field
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Phase transitions and soft modes in sodium bismuth titanate
S. B. Vakhrushev, B. E. Kvyatkovsky, N. M. Okuneva et al. · Ferroelectrics · 1985 · 280 citations
X-ray study of phase transitions in efrroelectric Na0.5Bi0.5TiO3
Jānis Zvirgzds, P. P. Kapostin, J. V. Zvirgzde et al. · Ferroelectrics · 1982 · 270 citations