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Comparative study of 2mol% Li- and Mn-substituted lead-free potassium sodium niobate ceramics

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Abstract

The effect of Li and Mn substitution on the dielectric, ferroelectric and piezoelectric properties of lead free K0.5Na0.5NbO3 (KNN) was investigated. Samples were prepared using a conventional solid state reaction method. The sintering temperature for all the samples was 1050°C. The optimum doping concentration for the enhancement of different properties without the introduction of any other co-dopants such as Ti, Sb, and La was investigated. X-ray diffraction analysis confirmed that all the samples crystallize in a single phase perovskite structure. The dielectric properties were investigated as a function of temperature and applied electric field frequency. Compared with Li-substituted KNN (KLNN), Mn-substituted KNN (KMNN) exhibited a higher dielectric constant ɛ max (i.e., 4840) at its critical transition temperature T c (i.e., 421°C) along with a lower value of tangent loss at 10 kHz and greater values of saturation polarisation P s (i.e., 20.14 μC/cm2) and remnant polarisation P r (i.e., 15.48 μC/cm2). The piezoelectric constant (d 33) of KMNN was 178 pC/N, which is comparable to that of lead-based hard ceramics. The results presented herein suggest that B-site or Mn substitution at the optimum concentration results in good enhancement of different properties required for materials used in memory devices and other applications.

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Authors and Affiliations

  1. School of Applied Sciences, Netaji Subhas Institute of Technology, Dwarka University of Delhi, New Delhi, 110078, India

    Asha Dahiya & O. P. Thakur

  2. Department of Physics, Hindu College, Sonepat, 131001, India

    J. K. Juneja

  3. Department of Physics, Geeta Vidya Mandir Girls College, Sonepat, 131001, India

    Sangeeta Singh &  Dipti

  4. School of Physics & Material Sciences, Thapar University, Patiala, 147004, India

    Dipti

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  1. Asha Dahiya
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  2. O. P. Thakur
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  3. J. K. Juneja
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  4. Sangeeta Singh
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  5. Dipti
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Correspondence to Asha Dahiya.

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Dahiya, A., Thakur, O.P., Juneja, J.K. et al. Comparative study of 2mol% Li- and Mn-substituted lead-free potassium sodium niobate ceramics. Int J Miner Metall Mater 21, 1241–1246 (2014). https://doi.org/10.1007/s12613-014-1033-3

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  • DOI: https://doi.org/10.1007/s12613-014-1033-3

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