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Applicant:
Central University of Tamil Nadu 
Author:
A. R. Jayakrishnan, Penna Venkata Karthik Yadav, J. P. B. Silva, K. C. Sekhar 
Corresponding Authors:
K. C. Sekhar 
DOI #:
https://doi.org/10.1016/j.jsamd.2019.12.001 
Title:
Microstructure tailoring for enhancing the energy storage performance of 0.98 [0.6 Ba (Zr0. 2Ti0. 8) O3-0.4 (Ba0. 7Ca0. 3) TiO3]-0.02 BiZn1/2Ti1/2O3 ceramic capacitors 
Journal:
Journal of Science: Advanced Materials and Devices 
Year:
2020 
Volume:
Page:
119 - 124 
Keywords:
Ceramics, Relaxor ferroelectrics, Lattice distortion, Grain size, Recoverable energy 
Abstract:
In this work, we introduce a new approach to enhance the energy storage properties of 0.98[0.6Ba(Zr0.2Ti0.8)O3-0.4(Ba0.7Ca0.3)TiO3]-0.02BiZn1/2Ti1/2O3 [BCZT-BZ] ceramic capacitors via tuning the microstructure through the sintering time. The x-ray diffraction (XRD) analysis confirmed the formation of BCZT-BZ solid solution without any secondary phase. It is observed that the rhombohedral and tetragonal phases co-exist in BCZT-BZ samples sintered at different time periods, except the one sintered for 11 h, where the rhombohedral and pseudocubic phases co-exist. The energy dispersive x-ray spectroscopy (EDS) revealed the presence of the elements constituting the BCZT-BZ samples. The variation of the grain size with the sintering time is explained based on the coalescence process and the Ostwald ripening mechanism. A strong correlation was observed between the ferroelectric properties and the microstructure. The sample sintered for 11 h with pseudocubic nature and small grain size shows a slim P-E loop owing to a high recoverable energy density (2.61 J/cm3) and a high efficiency (91%) at an electric field of 150 kV/cm. The observed recoverable energy density was found 3 to 13 times higher than that reported for bulk BCZT. These findings suggest that the present BCZT-BZ ceramics are attractive materials for the energy storage capacitor applications. 
Entered by:
Koppole Chandra Sekhar on 2020-09-01 
 
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