Abstract
Monophasic CaNaBi2Nb3O12 powders were synthesized via the conventional solid-state reaction route. Rietveld refinement of the X-ray powder diffraction (XRD) data and selected area electron diffraction (SAED) studies confirmed the phase to be a three-layer Aurivillius oxide associated with an orthorhombic B2cb space group. The dielectric properties of the ceramics have been studied in the 300–800 K temperature range at various frequencies (1 kHz to 1 MHz). A dielectric anomaly was observed at 676 K for all the frequencies corresponding to the ferroelectric to paraelectric phase transition as it was also corroborated by the high temperature X-ray diffraction studies. The incidence of the polarization–electric field (P vs. E) hysteresis loop demonstrated CaNaBi2Nb3O12 to be ferroelectric.
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Acknowledgement
One of the authors (SK) is grateful to the Council of Scientific and Industrial Research (CSIR), New Delhi, for the award of Senior Research Fellowship.
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Kumar, S., Varma, K.B.R. Crystal structure and electrical properties of CaNaBi2Nb3O12 ceramics. J Mater Sci 46, 2606–2610 (2011). https://doi.org/10.1007/s10853-010-5114-z
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DOI: https://doi.org/10.1007/s10853-010-5114-z