Role of B-site disorder in the properties of lead-free Na0.5Bi0.5(Mg1/3Nb2/3)O3 ceramic: A possible electrocaloric material with low leakage current

Banerjee, Krishnarjun and Singh, Nishant and Asthana, Saket (2022) Role of B-site disorder in the properties of lead-free Na0.5Bi0.5(Mg1/3Nb2/3)O3 ceramic: A possible electrocaloric material with low leakage current. Journal of Physics and Chemistry of Solids, 163. pp. 1-9. ISSN 0022-3697

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Abstract

The electrocaloric (EC) effect in ferroelectric materials has been studied extensively to develop materials for solid-state cooling applications. The Na0.5Bi0.5TiO3-based ferroelectric material is selected for this particular application. The Ti4+ of the lead-free Na0.5Bi0.5TiO3 is completely replaced by (Mg1/3Nb2/3)4+ to enhance the dielectric breakdown strength and to observe the EC effect. The lead-free Na0.5Bi0.5(Mg1/3Nb2/3)O3 is synthesized via the columbite route with optimized processing conditions. The material shows a frequency-independent high ferroelectric–paraelectric transition temperature (460 °C) with a slim polarization vs electric field loop. The adiabatic temperature change (ΔT) of the compound is evaluated from the temperature-dependent polarization behavior, and calculated ΔT is ≈ 0.135 K at room temperature. The room-temperature EC strength and leakage current of the material are examined to check its suitability for solid-state refrigeration. © 2022 Elsevier Ltd

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IITH Creators:

IITH Creators	ORCiD
Asthana, Saket	http://orcid.org/0000-0002-6420-3304

Item Type:

Article

Additional Information:

Author SA gratefully acknowledges the financial support provided by the CSIR-EMRII (Ref. No. 0194/NS ), and SERB, Department of Science and Technology ( CRG /2020/001509 ), India to carry out this work. Author KB acknowledges DST-INSPIRE, India (Fellowship Code No. IF160462) for financial assistance. We acknowledge Prof. Prabhakar Singh and Dr. Vani Pawar (IIT (BHU) Varanasi, India) for the specific heat measurement.

Uncontrolled Keywords:

Breakdown voltage; Electrocaloric effect; Lead-free ferroelectric

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

22 Jul 2022 09:14

Last Modified:

22 Jul 2022 09:14