Improved recoverable energy storage density, breakdown strength, and relaxor nature in eco-friendly K+1-ion rich NBT ferroelectrics

Sahu, Ranjan Kumar and Asthana, Saket (2022) Improved recoverable energy storage density, breakdown strength, and relaxor nature in eco-friendly K+1-ion rich NBT ferroelectrics. Journal of Alloys and Compounds, 929. pp. 1-13. ISSN 0925-8388

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Abstract

Eco-friendly lead-free polycrystalline Na0.5−x Kx Bi0.5TiO3 (x = 0.30,0.35,0.40,0.45) series were synthesized by the solid-state reaction method. The site-specific substitution of K-ion has been performed by varying its concentration. The processing parameters were optimized with increasing K+1-ion percentage. The polarization (P), current (I) and strain (S) behavior with an electric field (E) support the enhanced relaxor nature which is further strengthened by the temperature-dependent dielectric studies. The maximum value of the dielectric constant was found to be 4726 in x = 0.30 composition. The value of Tm is increased from 320°C to 350°C by the substitution of the higher percentage of potassium. The shape of the P-E and I-E loops transforms from pinched type to open type slanted loop. The increased breakdown strength as well as the coercive field with the potassium concentration were confirmed through P-E and I-E hysteresis. The dielectric breakdown has reached close to ∼102 kV/cm for x = 0.45. The optimum estimated recoverable energy storage density and efficiency are found to be ∼0.5 J/cm3 and 58%, respectively, for x = 0.30 among studied compounds. Thus, x = 0.30 composition is found to be suitable for a dielectric capacitor as well as energy storage applications. © 2022 Elsevier B.V.

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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 acknowledges the UGC-DAE ( CRS/2021–22/03/553 ), and Science and Engineering REsearch Board (SERB) ( CRG/ 2020/001509 ), India to carry out this work. Author RS acknowledges the Ministry of Human Resource and Development (MHRD), Government of India , for providing financial assistance.

Uncontrolled Keywords:

Lead-free relaxor ferroelectrics; Na0.5Bi0.5TiO3-K0.5Bi0.5TiO3; Processing parameters; Recoverable energy storage density

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

10 Oct 2022 11:10

Last Modified:

10 Oct 2022 11:10