Abstract
In this study, we fabricated Li+ doped Bi1/2Na1/2-xLixTiO3 [BNLT] (x = 0.0, 0.025, 0.05, 0.075 and 0.1) nanoceramics by double sintered solid-state reaction method. The structural, optical, dielectric and ferroelectric properties of the ceramic samples have been investigated. X-ray diffraction results confirm that all the ceramics are pure phase perovskite with rhombohedral structure and R3c space group. The different bonds (Bi3+/Na+/Li+ and Ti4+–O) related to vibrational modes have been studied by analyzing the Raman spectra. The observed optical band gaps were found to decrease from 3.37 to 3.31 eV as the Li+ doping is increased. The dielectric permittivity (ε′) and loss factor (tan δ) reduces with a raise in the frequency whereas at elevated frequency both became constant. Dielectric plot show irregular trends with increasing Li+ ion replacement. The ac conductivity is found to rise with a higher frequency. Modulus and complex impedance study point toward the continuation of equal grain and grain boundary assistance in BNLT ceramics. The P–E hysteresis loops verify the ferroelectric nature of all the ceramics.
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Acknowledgements
UGC-DAE-CSR, as an institute is acknowledged for extending its facilities. Authors acknowledge fruitful discussion with Dr. M. Gupta, Dr. V. G. Sathe, Dr. U. P. Deshpande and Dr. V. R. Reddy of UGC-DAE CSR, Indore. Thanks to Mr. Layanta Behera and Mr. V. K. Ahire for their technical assistance. The authors are also thankful to the Late Dr. Dinesh Varshney, for his support and encouragement.
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Patel, S., Saxena, P., Choudhary, P. et al. Effect of Li+ Ion Substitution on Structural and Dielectric Properties of Bi0.5Na0.5-xLixTiO3 Nanoceramics. J Inorg Organomet Polym 31, 851–864 (2021). https://doi.org/10.1007/s10904-020-01818-w
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DOI: https://doi.org/10.1007/s10904-020-01818-w