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Phase modified ferroelectricity in Na0.5-xKxBi0.5TiO3

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Abstract

Rietveld analysis on (Na1 − xKx)0.5Bi0.5TiO3 {x = 0, 15%, 20%, 22.5%, 25%, & 30%}, depicts change in structural symmetry from R3c for NBT to R3m and P4mm in NBT-KBT solid solutions. A mixed phase with R3m and P4mm is obtained for doping from 20 to 25%, where 22.5% composition has an equal proportion of both phases. Frequency and temperature-dependent dielectric relaxation studies for (Na1 − xKx)0.5Bi0.5TiO3 shows a transition from a high-temperature paraelectric state to ergodic relaxor state (TC = 300–330˚C) with a crossover in domain-structure & number density at x = 22.5%. The change in the structural symmetry of ceramics greatly influences observed dielectric properties. Havriliak Negami (H-N) parameters substantiate the presence of relaxor-isotherms with change in dipolar interactions and the random field with K-doping concentration. The H-N analysis with relaxation time ‘τ,’ relaxation time distribution function, and asymmetry parameter ‘β’ strongly supports enhanced piezoelectric properties for x = 22.5% specimen. Polarization traced with E-field supports the outcomes of H-N analysis. Enhanced piezoelectric coefficient d33 = 208pC/N is observed for 22.5% K-doped NBT, with an electromechanical coupling factor of ~ 44%.

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Acknowledgements

The authors are grateful to the IRCC, Indian Institute of Technology, Bombay, for the XRD, dielectric, and polarization (BDS) facilities. P. Sahlot thanks the institute for financial support through the institute’s post-doctoral fellowship. The authors would like to acknowledge Dr. P.K. Ojha, Naval Materials Research Laboratory, for providing poling and piezoelectric measurement facilities.

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Authors and Affiliations

  1. Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra, 400076, India

    Pooja Sahlot, Pravin Varade & A. R. Kulkarni

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  1. Pooja Sahlot
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  2. Pravin Varade
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  3. A. R. Kulkarni
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PV: sample preparation and data acquisition. PS: Software and analysis, writing, and editing. ARK: supervision, review, and editing.

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Correspondence to A. R. Kulkarni.

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Sahlot, P., Varade, P. & Kulkarni, A.R. Phase modified ferroelectricity in Na0.5-xKxBi0.5TiO3. J Mater Sci: Mater Electron 34, 547 (2023). https://doi.org/10.1007/s10854-023-09943-1

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