Abstract
The dielectric and ferroelectric properties of Ba1−(3/2)xNdxBi4Ti4O15 (BNBT) ceramics prepared by using the solid-state reaction route have been studied. X-ray diffraction study revealed that all the samples are in the orthorhombic symmetry with space group A21am. The dielectric study as a function of temperature demonstrated a ferroelectric to paraelectric transition is of diffuse type. The transition temperature (Tc) was found to be increased from 420 °C (x = 0) for BNBT to 500 °C (x = 0.40) at 500 MHz, thus broadening the utilization temperature range of the ceramics. Sample x = 0.40 with the lowest TKε value, indicating the best dielectric temperature stability in all samples. The very high oxygen vacancy of the sample x = 0.40 partially contributes to its higher Tc. However, x = 0.10 sample shows the lowest tan δ at 300 °C, which shows the lowest electrical conductivity in all the samples. The effect of Nd additives on the degree of diffuseness of the dielectric constant curves of BNBT was discussed by using modified Curie–Weiss law. The ferroelectric nature of the samples has been confirmed from the measurement of the hysteresis loop at room temperature.
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The authors thank the University Department of Physics, Dr. Shyama Prasad Mukherjee University, Ranchi, for providing the necessary infrastructure to carry out our research.
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Rana, T., Sharma, J.P., Sonu, B.K. et al. Dielectric phase transition and ferroelectric properties of neodymium-doped BaBi4Ti4O15 layered ceramics. J Mater Sci: Mater Electron 32, 11969–11977 (2021). https://doi.org/10.1007/s10854-021-05826-5
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DOI: https://doi.org/10.1007/s10854-021-05826-5