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- W1987105222 abstract "The layered perovskite CsBiNb2O7 has been reinvestigated in the light of recent predictions of ferroelectric behavior. Variable temperature powder neutron diffraction experiments show that this material retains polar symmetry (space group P2(1)am) up to at least 900 degrees C, with only a slight decrease in net polarization up to this temperature, calculated using a simple ionic model. However, ac impedance measurements show only a modest dielectric constant (19-27) throughout the temperature range studied. Moreover, convincing evidence for ferroelectric behavior in polarization-electric field loops could not be obtained because of overriding electrical conductivity. Further measurements of electrical behavior, at different temperatures and under both wet and dry atmospheres, provide clear evidence that CsBiNb2O7 is hygroscopic, with water uptake resulting in significant protonic conductivity. Even in the dehydrated state the material is a semiconductor with a modest conductivity of 3.8 mu S cm(-1) at 250 degrees C. Although ferroelectric behavior is not observed in the samples studied here, we cannot rule out the possibility that ferroelectricity might be obtained in samples processed under appropriate conditions." @default.
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- W1987105222 date "2009-07-21" @default.
- W1987105222 modified "2023-09-26" @default.
- W1987105222 title "ChemInform Abstract: Leakage and Proton Conductivity in the Predicted Ferroelectric CsBiNb2O7." @default.
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- W1987105222 doi "https://doi.org/10.1002/chin.200929010" @default.
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