The effect of CuO and NiO doping on dielectric and ferroelectric properties of Na0.5Bi0.5TiO3 lead-free ceramics |
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Authors: | Sunanda Kakroo Arvind Kumar SK Mishra Vijay Singh Pramod K Singh |
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Institution: | 1. Research and Technology Development Center, School of Basic Sciences &2. Research, Sharda University, Greater Noida, Indiasunandakakroo@gmail.com;4. G. L. Bajaj, Institute of Technology &5. Management, Greater Noida, India;6. Group Director(Research), Rameesh Group of Institutions, Greater Noida, India;7. Department of Chemical Engineering, Konkuk University, Seoul, Republic of Korea;8. Research, Sharda University, Greater Noida, India;9. Institute of Micro and Nanosystem Technology, Vestfold University College, Tonsberg, Norway |
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Abstract: | In the present work, lead-free piezoelectric ceramics (Na0.5Bi0.5)TiO3 –xCuO–yNiO (for x = 0.0, 0.02, 0.04 and 0.06) have been prepared by a conventional solid-state reaction method. An investigation of CuO and NiO doping in bismuth sodium titanate (BNT) and a study of the structure, morphology, and dielectric and ferroelectric properties of the NBT–CuNi system have been conducted. Phase and microstructural analysis of the (Na0.5Bi0.5)TiO3 (NBT) based ceramics has been carried out using X-ray diffraction and scanning electron microscopy (SEM) techniques. Field emission scanning electron microscopy (FE-SEM) images showed that inhibition of grain growth takes place with increasing Cu and Ni concentration. The results indicate that the co-doping of NiO and CuO is effective in improving the dielectric and ferroelectric properties of NBT ceramics. Temperature-dependent dielectric studies have also been carried out at room temperature to 400 °C at different frequencies. The NBT ceramics co-doped with x = 0.06 and y = 0.06 exhibited an excellent dielectric constant ?r = 1514. The study suggests that there is enormous scope of application of such materials in the future for actuators, ultrasonic transducers and high-frequency piezoelectric devices. |
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Keywords: | ceramics X-ray diffraction dielectric properties piezoelectricity ferroelectric |
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