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Probing the structural and electrical traits of lead-free Zn/Mn co-substituted CaCu3Ti4O12-based perovskite ceramics

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Abstract

Perovskite ceramics are captivating in the field of electronics by virtue of their exceptionally high dielectric permittivity and numerous potential applications such as power transmission, storage devices, and capacitors. Herein, Zn and Mn-co-substituted polycrystalline Ca1−xZnxCu3−yMnyTi4O12 (x = 0.05, 0.1, 0.15 and y = 0.1, 0.15, 0.2), a lead-free perovskite ceramics material is fabricated through the economically viable sol–gel technique and employed to examine the structural, morphological, dielectric, and electrical conductivity studies. Co-substitution of Zn and Mn ions leads to a significant reduction in the grain size for the CCTO ceramic compound. All the prepared ceramics exhibit a pristine cubic perovskite phase with a space group of Im-3. The surface topography of the as-prepared thermally etched CCTO ceramic exemplifies homogeneous grain distribution and minimal porosity on the surface. The incorporation of Zn and Mn ions increased the grain boundary resistance (RGB), lowering the dielectric loss and improving the temperature stability of the dielectric attributes. The relaxation dynamics were highlighted using the complex impedance and modulus framework, whereas the conduction framework was probed using electrical conductivity. The temperature progression of electrical conduction is implemented by Jonscher’s power law and outlined in terms of an overlapping large-polaron tunneling (OLPT) model. The comprehensive impedance and conductivity studies confirmed that the ceramics have a negative temperature coefficient of resistance (NTCR), acknowledging the semiconducting nature of the samples at an elevated temperature. Accordingly, the co-substitution of Zn and Mn ions at the A-sites improves the overall performance of dielectric and electrical features of the CCTO ceramics.

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The authors have no relevant financial or non-financial interests to disclose. Moreover, the research did not involve any human participants or animals.

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Authors and Affiliations

  1. Department of Physics, Loyola College (Autonomous), Affiliated to University of Madras, Chennai, Tamil Nadu, 600 034, India

    S. Grace Infantiya, A. Aslinjensipriya, R. Sylvia Reena, K. Joseph Pious & S. Jerome Das

  2. Advanced Functional Nanohybrid Material Laboratory, Department of Chemistry, Dongguk University, Seoul-Campus, Jung-gu, Seoul, 04620, Republic of Korea

    Periyasamy Sivakumar

  3. Physics Division, School of Advanced Sciences, Vellore Institute of Technology (VIT), Chennai Campus, Chennai, Tamil Nadu, 600 127, India

    C. Justin Raj

  4. Department of Physics, Muthayammal Engineering College (Autonomous), Rasipuram, Namakkal, Tamil Nadu, 637 408, India

    S. Grace Infantiya

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Contributions

SGI: Conceptualization, methodology, investigation, writing—original draft. AA and RSR: Investigation and review and editing. KJP and PS: Review and editing, visualization, formal analysis. CJR and SJD: Conceptualization, methodology, review and editing, supervision. 

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Correspondence to C. Justin Raj or S. Jerome Das.

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Infantiya, S.G., Aslinjensipriya, A., Reena, R.S. et al. Probing the structural and electrical traits of lead-free Zn/Mn co-substituted CaCu3Ti4O12-based perovskite ceramics. J Mater Sci: Mater Electron 34, 1994 (2023). https://doi.org/10.1007/s10854-023-11393-8

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