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Impedance spectroscopy, pyroelectric and electrocaloric response of sol gel synthesized 0.94Bi0.5Na0.5TiO3–0.06BaTiO3 ceramics

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Abstract

Polycrystalline 0.94Bi0.5Na0.5TiO3–0.06BaTiO3 (BNT–6BT) is synthesized by sol–gel method. Coexistence of rhombohedral and tetragonal phases is evidenced by X-ray diffraction studies and RAMAN spectroscopy. The dielectric properties were studied in a wide frequency range from room temperature to 425 °C. A broad anomaly at Tm which is found to be frequency dependent indicates the conversion of macroscopic polarization domains into microscopic polar active region. The pyroelectric and electrocaloric response is studied via polarization–electric field (P–E loops) measured at various temperatures ranging from room temperature upto 150 °C. The pyroelectric coefficient, p is found to be 3.02 × 10–4 C/m2 K near to room temperature (30 °C). The figures of merit are Fi is 113 pm/V, Fv is 0.046 m2/C, Fe is 37 J/m3 K2, Fe* is 5.2 pm3/J and Fd is 4.8 μPa−0.5. An electrocaloric temperature change (∆T) of 0.44 K is observed at 80°C for 55 kV/cm.

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Funding

This work is done under the financial support (03(1390)/16/EMR-II) of Council of Scientific and Industrial Research (CSIR), India. One of the author, Ajeet Kumar would like to acknowledge the Department of Science and Technology-Science and Engineering Research Board, Govt. of India (SPG/202l/004250-C), India. Authors are also grateful to DST-FIST research grant for the XRD, RAMAN and ferroelectric measurements facilities.

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  1. Smart Materials Laboratory, School of Physics and Materials Science, Thapar Institute of Engineering and Technology, Patiala, Punjab, 147004, India

    Ajeet Kumar, Nitin Jaglan, Sudhanshu Dhumrash, Kamaldeep Kaur & Poonam Uniyal

  2. Department of Applied Sciences, Chandigarh Engineering College, Jhanjeri, Mohali, Punjab, 140307, India

    Anamol Gautam

  3. Physics Department, Chandigarh University, Chandigarh, India

    Kamaldeep Kaur

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AK: methodology, validation, formal analysis writing—original draft. NJ: data curation, validation, formal analysis writing—original draft, AG: validation, formal analysis, writing—review and editing. SD: validation, formal analysis, KDK: sample preparation. PU: validation, formal analysis, writing—review and editing, supervision.

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Kumar, A., Jaglan, N., Gautam, A. et al. Impedance spectroscopy, pyroelectric and electrocaloric response of sol gel synthesized 0.94Bi0.5Na0.5TiO3–0.06BaTiO3 ceramics. Appl. Phys. A 129, 722 (2023). https://doi.org/10.1007/s00339-023-06990-7

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