Abstract
High performance dielectric materials are highly required for practical application for energy storage technologies. In this work, high-k pristine and modified calcium copper titanate having nominal formula Ca0.95Nd0.05Cu3Ti4−xZrxO12 (x = 0.01, 0.03 & 0.10) were synthesized and characterized for structural and dielectric properties. Single phase formation of the synthesized compositions was confirmed by X-ray diffraction patterns and further analysed using Rietveld refinement technique. Phase purity of the synthesized ceramics was further confirmed by Energy-dispersive X-ray Spectroscopy (EDX) analysis. SEM images demonstrated that grain size of the modified CCTO ceramics was controlled by Zr4+ ions due to solute drag effect. Impedance spectroscopy was employed to understand the grain, grain boundaries and electrode contribution to the dielectric response. Nyquist plots were fitted with a 2R-CPE model which confirms the non-ideality of the system. Substitution of specific concentration of Nd and Zr improved the dielectric properties of high dielectric permittivity (ε′ ~ 16,902) and minimal tanδ (≤ 0.10) over a wide frequency range. The giant ε′ of the investigated system was attributed to internal barrier layer capacitance (IBLC) effect and reduced tanδ accredited to enhanced grain boundaries resistance due to substitution of Zr4+ ions at Ti4+ site.
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Acknowledgements
Authors are thankful to Department of Science and Technology, New Delhi for providing XRD facilities (FIST scheme). One of the author is thankful to the University Grants Commission, New Delhi for providing financial assistance through major research project (F. No. 41-853/2012 (SR)).
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Rani, S., Ahlawat, N., Sangwan, K.M. et al. Structural investigation and giant dielectric response of CaCu3Ti4O12 ceramic by Nd/Zr co-doping for energy storage applications. J Mater Sci: Mater Electron 29, 10825–10833 (2018). https://doi.org/10.1007/s10854-018-9150-9
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DOI: https://doi.org/10.1007/s10854-018-9150-9