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Applicant:
Indian Institute of Technology (IIT) Patna 
Author:
L. K. Pradhan, R. Pandey, S. Kumar and M. Kar 
Corresponding Authors:
Manoranjan Kar 
DOI #:
https://doi.org/10.1088/2053-1591/ab30e9 
Title:
Role of tricritical triple point type morphotropic phase boundary (multiple crystalline phases) on energy storage density in Bi0.5Na0.5TiO3 based solid solution 
Journal:
Mater. Res. Express  
Year:
2019 
Volume:
Page:
095521 
Keywords:
tricritical triple point, morphotropic phase 
Abstract:
Compositional engineering with different crystal symmetries has been considered as an imperative approach to enhance the ferroelectric as well as piezoelectric properties. An evidence of tricritical triple point type morphotropic phase boundary (TMPB) in Bi0.5Na0.5TiO3 based ternary solid solution (i.e. ((Bi0.5Na0.5)0.94Ba0.06)0.70Sr0.30TiO3/ BNBSTO) has been observed. It is confirmed by correlating the structural distortion with the physical properties. The multiple crystal symmetries (Cc, P4mm and Pm bar{3} 3 ̄ m) of the solid solution were identified by the Rietveld refinement of the x-ray diffraction pattern. The result is well supported by the Raman spectra analysis. The presence of non-polar phase (cubic) with the polar phases (monoclinic and tetragonal) in solid solution leads to reduce the energy barrier. Also, it enhances the polarization switching through polarization extension mechanism. The energy storage density of the BNBSTO solid solution is found to be maximum (∼0.38 J cm−3) at 61 kV cm−1. The dynamics of the electric field induced polarization (P-E hysteresis loop) and current density (J-E variation) curves reveal the presence of the polarization reversal with the domain switching process. Also, the compositional fluctuation at A-site of the BNBSTO solid solution leads to enhance the relaxor behavior, which reflects in the ferroelectric properties and relative dielectric permittivity. 
Entered by:
Physics Head on 2020-08-02 
 
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