Energy storage enhancement and bandgap narrowing of lanthanum and sodium co-substituted BaTiO3 ceramics

被引：13
作者：
Alkathy, Mahmoud S. [1 ]
Eiras, J. A. [1 ]
Raju, K. C. James [2 ]
机构：
[1] Univ Fed Sao Carlos, Phys Dept, Sao Carlos, Brazil
[2] Univ Hyderabad, Sch Phys, Hyderabad, India
来源：
FERROELECTRICS | 2021年 / 570卷 / 01期
基金：
巴西圣保罗研究基金会;
关键词：
Co-substitution; remnant polarization; energy storage; energy efficiency; power density; bandgap energy;
D O I：
10.1080/00150193.2020.1839266
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A novel lead-free Ba(1-x)(La,Na)(x)TiO3 (BLNT), (0 <= x <= 0.08) ferroelectric ceramic with enhanced energy storage density was fabricated by the conventional solid-state method. With an increase in La3+/Na+ content, the energy storage density, efficiency and power density were increased. The samples with (x = 0.08) show recoverable energy storage of (1.07 J/cm3), 3 times higher than that of pure BaTiO3 ceramics, energy storage efficiency of (87.6%) and power density of 0.314 MW/cm(3), 17 times greater than that of pure BaTiO3 ceramics. Comparison with other lead-free ferroelectric ceramics confirmed the superiority potential of (BLNT-0.08) ceramics for the design of ceramics capacitors for energy storage applications. The effect of La3+/Na+ contents on the optical properties of BaTiO3 ceramics was studied via UV spectroscopy. The results revealed that the introduction of structure disorder by means of A-site vacancies leading to the creation of shallow defects resulting in narrowing the bandgap energy. This work may provide a simple and powerful method to develop inexpensive energy storage and photovoltaic devices based on ferroelectric ceramics.
引用
收藏
页码：153 / 161
页数：9
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