• Title
    [Domestic Journal] Energy Storage Properties of Dy3+ Doped Sr0.5Ba0.5Nb2O6 Thick Film With Nano-Size Grains
  • Journal
    METALS AND MATERIALS INTERNATIONAL
  • Authors
    Daeyeol Yang, Soo-Bin Kang, Ji-Ho Lim, Songhyeon Yoon, Jungho Ryu, Jong-Jin Choi, Thamil Selvi Velayutham, Hyungsun Kim and Dae-Yong Jeong*
  • Date
    September, 2017
  • Citation Index
    SCI
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  • 114
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  • 글주소
  • 02-20
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Keywords: aerosol-deposition, SBN, energy storage materials, nanostructured materials, ferroelectric materials

Abstract​

We studied the temperature stable high-energy storage capacitors. Sr0.5Ba0.5Nb2O6 (SBN) is the lead-free ferroelectric
solid solution between BaNb2O6 and SrNb2O6. By doping Dy into SBN, the Curie temperature was lowered
and dielectric constant was increased. To improve the breakdown behavior of Dy-doped SBN, the aerosoldeposition(
AD) was applied to fabricate the dense films with nano-sized grains. These nano-grain give a large
number of grain boundaries, suppressing the electron conduction in ceramics. The dielectric constant and breakdown
electric field of the AD films annealed at 650 °C were measured as 2307 and 9.9 MV/m, while bulk were
1080 and 4 MV/m. Energy density and efficiency of the AD films annealed at 650 °C were also enhanced as 0.65 J/
cc and 90.2% and bulk were 0.08 J/cc and 72.1%, respectively. In addition, the dielectric constant of AD film
annealed at 550 °C and 650 °C were quite stable up to 150 °C.