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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.29 No.2 pp.73-78
DOI : https://doi.org/10.3740/MRSK.2019.29.2.73

Improvement of Energy Storage Characteristics of (Ba0.7Ca0.3)TiO3 Thick Films by the Increase of Electric Breakdown Strength from Nano-Sized Grains

Ju-Seung Lee1,Songhyeon Yoon1,Ji-Ho Lim1,Chun-Kil Park1,Jungho Ryu2,Dae-Yong Jeong1†
1Department of Materials Science & Engineering, Inha University, Incheon, 22212, Republic of Korea
2School of Materials Science & Engineering, Yeungnam University, Gyeongsan, Gyeongbuk, 38541, Republic of Korea
Corresponding author E-Mail : dyjeong@inha.ac.kr (D.-Y. Jeong, Inha Univ.)

Abstract

Lead free (Ba0.7Ca0.3) TiO3 thick films with nano-sized grains are prepared using an aerosol deposition (AD) method at room temperature. The crystallinity of the AD thick films is enhanced by a post annealing process. Contrary to the sharp phase transition of bulk ceramics that has been reported, AD films show broad phase transition behaviors due to the nanosized grains. The polarization-electric hysteresis loop of annealed AD film shows ferroelectric behaviors. With an increase in annealing temperature, the saturation polarization increases because of an increase in crystallinity. However, the remnant polarization and cohesive field are not affected by the annealing temperature. BCT AD thick films annealed at 700 oC/2h have an energy density of 1.84 J/cm3 and a charge-discharge efficiency of 69.9%, which is much higher than those of bulk ceramic with the same composition. The higher energy storage properties are likely due to the increase in the breakdown field from a large number of grain boundaries of nano-sized grains.

절연파괴특성 향상을 위한 나노미세구조 (Ba0.7Ca0.3)TiO3 후막 제조 및 에너지 저장 특성 평가

이주승1,윤송현1,임지호1,박춘길1,류정호2,정대용1†
1인하대학교 신소재공학과,2영남대학교 신소재공학부

초록

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