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Grain size engineered Ba 0.9 Sr 0.1 Ti 0.9 Hf 0.1 O 3 ‐Na 0.5 Bi 0.5 TiO 3 relaxor ceramics with improved energy storage performance
Author(s) -
Jain Aditya,
Wang Yingang,
Guo Hao,
Wang Neng
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17346
Subject(s) - materials science , ferroelectricity , ceramic , composite number , grain boundary , piezoelectricity , composite material , grain size , energy storage , nanocomposite , phase boundary , phase (matter) , microstructure , dielectric , thermodynamics , optoelectronics , chemistry , power (physics) , physics , organic chemistry
Novel lead‐free diphasic (1‐ x )Ba 0.9 Sr 0.1 Ti 0.9 Hf 0.1 O 3 ‐ x Na 0.5 Bi 0.5 TiO 3 (BSTH‐NBT) ceramic nanocomposites were synthesized via an economically viable modified mechano‐chemical activation technique. In the present investigation, we have developed an energy storage composite material by systematically optimizing the charge transport behavior and charge storage characteristics between the ferroelectric BSTH and piezoelectric NBT phase. The composite with x = 0.09 NBT concentration has shown the best energy storage properties with 1.61 J/cm 3 discharge energy density along with 80.1% energy efficiency. The BSTH and NBT had a synergetic effect on the ferroelectric properties of the composites. The improvement in ferroelectric and piezoelectric properties along with excellent aging characteristics in composite materials is mainly attributed to enhancement in microstructural density, grain boundary interface, and stress effects. The improved dispersibility and excellent compatibility between BSTH and NBT phase have resulted in approximately 20% enhancement in breakdown strength of composite compared to pure BSTH ceramic.