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Journal of Advanced Ceramics 2020, 9(2): 210-219 https://doi.org/10.1007/s40145-020-0361-1
Research Article | Open Access | Issue | Published: 07 April 2020

Enhanced dielectric and electrocaloric properties in lead-free rod-like BCZT ceramics

Show Author's Information Zouhair HANANIa,b,  Soukaina MERSELMIZa,  Abdelaadim DANINEc,  Nicolas STEINc,  Daoud MEZZANEa,  M’barek AMJOUDa( ),  Mohammed LAHCINIa,d,  Yaovi GAGOUe,  Matjaz SPREITZERf,  Damjan VENGUSTf,  Zdravko KUTNJAKf,  Mimoun El MARSSIe,  Igor A. LUK'YANCHUKe,g,  Mohamed GOUNÉb
IMED-Lab, Cadi Ayyad University, Marrakesh 40000, Morocco
ICMCB, University of Bordeaux, Pessac 33600, France
IJL, University of Lorraine, Nancy 54000, France
UM6P, Ben Guerir 43150, Morocco
LPMC, University of Picardy Jules Verne, Amiens 80039, France
Jozef Stefan Institute, Ljubljana 1000, Slovenia
Physics Faculty, Southern Federal University, Rostov-on-Don 344090, Russia
Keywords:
dielectric, ferroelectric, lead-free Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT), rod-like Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT), electrocaloric effect
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HANANI Z, MERSELMIZ S, DANINE A, et al. Enhanced dielectric and electrocaloric properties in lead-free rod-like BCZT ceramics. Journal of Advanced Ceramics, 2020, 9(2): 210-219. https://doi.org/10.1007/s40145-020-0361-1
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Abstract Full text About this article

Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT) lead-free ceramics demonstrated excellent dielectric, ferroelectric, and piezoelectric properties at the morphotropic phase boundary (MPB). So far, to study the effect of morphological changes on dielectric and ferroelectric properties in lead-free BCZT ceramics, researchers have mostly focused on the influence of spherical grain shape change. In this study, BCZT ceramics with rod-like grains and aspect ratio of about 10 were synthesized by surfactant-assisted solvothermal route. X-ray diffraction (XRD) and selected area electron diffraction (SAED) performed at room temperature confirm the crystallization of pure perovskite with tetragonal symmetry. Scanning electron microscopy (SEM) image showed that BCZT ceramics have kept the 1D rod-like grains with an average aspect ratio of about 4. Rod-like BCZT ceramics exhibit enhanced dielectric ferroelectric (εr = 11,906, tanδ = 0.014, Pr = 6.01 µC/cm², and Ec = 2.46 kV/cm), and electrocaloric properties (ΔT = 0.492 K and ζ = 0.289 (K·mm)/kV at 17 kV/cm) with respect to spherical BCZT ceramics. Therefore, rod-like BCZT lead-free ceramics have good potential to be used in solid-state refrigeration technology.


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About this article

Enhanced dielectric and electrocaloric properties in lead-free rod-like BCZT ceramics

Show Author's information Zouhair HANANIa,b, Soukaina MERSELMIZa, Abdelaadim DANINEc, Nicolas STEINc, Daoud MEZZANEa, M’barek AMJOUDa( ), Mohammed LAHCINIa,d, Yaovi GAGOUe, Matjaz SPREITZERf, Damjan VENGUSTf, Zdravko KUTNJAKf, Mimoun El MARSSIe, Igor A. LUK'YANCHUKe,g, Mohamed GOUNÉb
IMED-Lab, Cadi Ayyad University, Marrakesh 40000, Morocco
ICMCB, University of Bordeaux, Pessac 33600, France
IJL, University of Lorraine, Nancy 54000, France
UM6P, Ben Guerir 43150, Morocco
LPMC, University of Picardy Jules Verne, Amiens 80039, France
Jozef Stefan Institute, Ljubljana 1000, Slovenia
Physics Faculty, Southern Federal University, Rostov-on-Don 344090, Russia

Abstract

Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT) lead-free ceramics demonstrated excellent dielectric, ferroelectric, and piezoelectric properties at the morphotropic phase boundary (MPB). So far, to study the effect of morphological changes on dielectric and ferroelectric properties in lead-free BCZT ceramics, researchers have mostly focused on the influence of spherical grain shape change. In this study, BCZT ceramics with rod-like grains and aspect ratio of about 10 were synthesized by surfactant-assisted solvothermal route. X-ray diffraction (XRD) and selected area electron diffraction (SAED) performed at room temperature confirm the crystallization of pure perovskite with tetragonal symmetry. Scanning electron microscopy (SEM) image showed that BCZT ceramics have kept the 1D rod-like grains with an average aspect ratio of about 4. Rod-like BCZT ceramics exhibit enhanced dielectric ferroelectric (εr = 11,906, tanδ = 0.014, Pr = 6.01 µC/cm², and Ec = 2.46 kV/cm), and electrocaloric properties (ΔT = 0.492 K and ζ = 0.289 (K·mm)/kV at 17 kV/cm) with respect to spherical BCZT ceramics. Therefore, rod-like BCZT lead-free ceramics have good potential to be used in solid-state refrigeration technology.

Keywords: dielectric, ferroelectric, lead-free Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT), rod-like Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT), electrocaloric effect

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Publication history

Received: 29 October 2019
Revised: 24 December 2019
Accepted: 12 January 2020
Published: 07 April 2020
Issue date: April 2020

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© The author(s) 2020

Acknowledgements

The authors gratefully acknowledge the generous financial support of CNRST Priority Program (PPR 15/2015), Slovenian Research Agency Program (P1-0125), and European Union’s Horizon 2020 Research and Innovation Program under the Marie Skłodowska-Curie Grant Agreement (No. 778072).

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