Enhanced Ferroelectric and Converse Piezoelectric Properties of Dense Lead-Free Na0.4K0.1Bi0.5TiO3 Ceramics for Actuator Applications - Advances in Materials Physics and Chemistry

AMPC > Vol.9 No.1, January 2019

Advances in Materials Physics and Chemistry

Volume 9, Issue 1 (January 2019)

ISSN Print: 2162-531X ISSN Online: 2162-5328

Google-based Impact Factor: 0.65 Citations h5-index & Ranking

Enhanced Ferroelectric and Converse Piezoelectric Properties of Dense Lead-Free Na_0.4K_0.1Bi_0.5TiO₃ Ceramics for Actuator Applications ()

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DOI: 10.4236/ampc.2019.91001 835 Downloads 2,433 Views Citations

Author(s)

N. Shara Sowmya, Pravin Varade, Narayanan Venkataramani, Ajit R. Kulkarni^*

Affiliation(s)

Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai, India.

ABSTRACT

In this work, lead-free Na_0.4Bi_0.5TiO₃-K_0.1Bi_0.5TiO₃(NKBT) piezoelectric ceramics were prepared by the solid-state reaction method and their structural, ferroelectric and dielectric properties were systematically studied. NKBT sintered at 1150℃ for 4 h exhibited highly dense (96% - 98% of the theoretical density) and uniform grains of size 1.1 μm. The coexistence of tetragonal (P4bm) and rhombohedral (R3c) phases due to the presence of morphotrophic phase boundary for the chosen composition has been confirmed by the Rietveld refinement studies. Enhanced ferroelectric properties such as remnant polarization (P_r) and coercive field (E_C) are found to be 37 μC/cm²and 30 kV/cm, respectively. The optimized synthesis procedure for NKBT ceramics resulted in enhanced strain (%) and converse piezoelectric coefficient (d₃₃^*) of 0.3 % and 554 pm/V which is attributed to smaller grain size and switching of non 180^o domains. NKBT ceramics with such excellent piezoelectric properties can be considered as a promising candidate for actuator applications.

KEYWORDS

Lead-Free Piezoelectric, Morphotropic Phase Boundary, Converse Piezoelectric Coefficient, Actuator

Share and Cite:

Sowmya, N. , Varade, P. , Venkataramani, N. and Kulkarni, A. (2019) Enhanced Ferroelectric and Converse Piezoelectric Properties of Dense Lead-Free Na_0.4K_0.1Bi_0.5TiO₃ Ceramics for Actuator Applications. Advances in Materials Physics and Chemistry, 9, 1-10. doi: 10.4236/ampc.2019.91001.

Cited by

[1]	Enhanced ferroelectric and piezoelectric response by MnO2 added Bi0. 5 (K0. 2Na0. 8) 0.5 TiO3 ceramics
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[2]	Lead-free Na0. 4K0. 1Bi0. 5TiO3 ceramic: Poling effect and enhancement in electromechanical and piezoelectric voltage coefficient
	2020

[3]	(Na0.8K0.2)0.5Bi0.5TiO3 thin film: A Pb-free MPB composition with large piezoelectricity
	2020

[4]	Enhancement in dielectric, ferroelectric, and piezoelectric properties of BaTiO3-modified Bi0. 5 (Na0. 4K0. 1) TiO3 lead-free ceramics
	2019

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