EFFECT OF K-EXCESS ON ENERGY STORAGE DENSITY AND EFFICIENCY OF Bi0.5K0.5+xTiO3 FILMS

  • Nguyen Ngoc Minh Hung Yen University of Technology and Education
  • Bui Van Dan Hung Yen University of Technology and Education
  • Luong Xuan Dien School of Chemical Engineering, Hanoi University of Science and Technology
  • Phan Si Nguyen School of Engineering Physics, Hanoi University of Science and Technology
  • Ngo Duc Quan School of Engineering Physics, Hanoi University of Science and Technology
Keywords: Lead-free, Ferroelectric, Sol-Gel, BKT, Films

Abstract

In this work, we synthesized lead-free Bi0.5K0.5TiO3 (bismuth potassium titanate, BKT) ferroelectric films on Pt/Ti/SiO2/Si substrates via the chemical solution deposition. The microstructures, ferroelectric and energy-storage properties of the fi lms were investigated as a function of K-excess content. X-ray diffraction (XRD) patterns exhibited sharp diffraction peaks of the single-phase perovskite structure which confirmed that the films have reached the well-crystallized state. The films with K-excess content of 0.10 revealed the best ferroelectricity with the remnant polarization (Pr ) and maximum polarization (Pm) reaching the highest values of 9.6 μC/cm2 and 27.1 μC/cm2, respectively under the electric field of 400 kV/cm. These films also exhibited a large energy-storage density (Jreco ) of ~ 3.5 J/cm3. The obtained results indicate that the BKT fi lms have application potentials in advanced capacitors.

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Published
2021-04-23
How to Cite
Nguyen Ngoc Minh, Bui Van Dan, Luong Xuan Dien, Phan Si Nguyen, & Ngo Duc Quan. (2021). EFFECT OF K-EXCESS ON ENERGY STORAGE DENSITY AND EFFICIENCY OF Bi0.5K0.5+xTiO3 FILMS. UTEHY Journal of Science and Technology, 28, 91-96. Retrieved from https://tapchi.utehy.edu.vn/index.php/jst/article/view/415