Journal
CERAMICS INTERNATIONAL
Volume 43, Issue 10, Pages 7653-7659Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.03.062
Keywords
Bismuth sodium titanate; Lead-free; Phase transition; Energy storage
Categories
Funding
- Natural Scientific Research of Jiangsu Higher Education Institutions [12KJA430002]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
- Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT) [IRT1146]
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Lead-free (1-x)(0.75Bi(0.5)Na(0.5)TiO(3)-0.25Bi(0.5)K(0.5)TiO(3))-xBiAlO(3) (BNT-BKT-100xBA, x=0-0.10) ceramics were prepared by two-step sintering method and their phase structure, micro morphology and electrical properties were systematically investigated. X-ray diffraction analysis indicates a pure perovskite phase for x <= 0.06 as well as a structural evolution from a tetragonal toward a pseudocubic phase. Transmission electron microscopy study of the x=0.04 composition reveals the existence of antiferroelectric phase with a(0)a(0)c(+) oxygen octahedron tilting which is in the form of nano-domains. Polarization-electric field and current-electric field hysteresis loops demonstrate that the increase of BA concentration destroys the ferroelectric order and strengthens antiferroelectric order. A much enhanced energy storage density of 1.15 J/cm(3) and efficiency of 73.2% is achieved under 105 kV/cm at x=0.06. In addition, its energy storage property is found to depend weakly on temperature within the measurement range of 25-150 degrees C.
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