Influence of Crystallization Time on Energy-Storage Density and Efficiency of Lead-Free Bi0.5(Na0.8K0.2)0.5TiO3 Thin Films

Lead-free Bi0.5(Na0.80K0.20)0.5TiO3 (BNKT) ferroelectric films were synthesized on Pt/Ti/SiO2/Si substrates via chemical solution deposition. The influence of crystallization time on the microstructures and ferroelectric and energy-storage properties of the films was investigated in detail. The XRD...

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Bibliographic Details
Published in:Advances in condensed matter physics 2019, Vol.2019 (2019), p.1-8
Main Authors: Quan, Ngo Duc, Hung, Vu Ngoc, Toan, Tran Quoc
Format: Article
Language:English
Subjects:
Annealing
Ceramics
Crystallization
Density
Dielectric properties
Electric fields
Energy
Energy storage
Ferroelectric materials
Ferroelectricity
Lead free
Nitrates
Organic chemistry
Perovskite structure
Perovskites
Phase transitions
Polarization
Silicon dioxide
Silicon substrates
Thin films
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Summary:Lead-free Bi0.5(Na0.80K0.20)0.5TiO3 (BNKT) ferroelectric films were synthesized on Pt/Ti/SiO2/Si substrates via chemical solution deposition. The influence of crystallization time on the microstructures and ferroelectric and energy-storage properties of the films was investigated in detail. The XRD analysis showed that the BNKT films have well crystallized corresponding to the single-phase perovskite structure at 700°C. Ferroelectric and energy-storage properties of the films were significantly enhanced by increasing crystallization time. With crystallization time of 60 min, the remnant polarization (Pr), maximum polarization (Pm), and Pm-Pr values reached the highest values of 7.9 µC/cm2, 28.9 µC/cm2, and 21.0 µC/cm2, respectively, under the electric field of 400 kV/cm. Thanks to the strong enhancement in Pm and the large Pma-Pr value, the highest recoverable energy-storage density (Jreco) gets the value of 2.9 J/cm3. The obtained results indicate that the BNKT films have application potentials in advanced capacitors.
ISSN:1687-8108
1687-8124
DOI:10.1155/2019/4949365