BROWSE

Related Researcher

Author's Photo

Cho, Seungho
School of Materials Science and Engineering
Research Interests
  • Metal Oxide Crystal Growth

ITEM VIEW & DOWNLOAD

Lead-free relaxor thin films with huge energy density and low loss for high temperature applications

Cited 0 times inthomson ciCited 0 times inthomson ci
Title
Lead-free relaxor thin films with huge energy density and low loss for high temperature applications
Author
Kursumovic, AhmedLi, WeiweiCho, SeunghoCurran, Peter J.Tjhe, DionisiusMacManus-Driscoll, Judith L.
Issue Date
2020-05
Publisher
Elsevier BV
Citation
NANO ENERGY, v.71, pp.104536
Abstract
We report record energy storage density (>80 J cm−3) in Pb-free relaxor ferroelectrics based on Mn-doped BiFeO3–BaTiO3 thin films. Rapid interval deposition was used to impose layer-by-layer growth improving crystallinity and lowering unwanted defects concentration. The growth and Mn doping produced an order of magnitude lower leakage, with strongly reduced dielectric loss (from room temperature to >300 °C, and 100 Hz to 1 MHz), e.g. by a factor of 5 at 225 °C and 25 kHz. At room temperature (RT), the dielectric breakdown strength increased by a factor of 1.5 to >3000 kV cm−1 while the dielectric constant remained flat, at ~1000 from RT to 350 °C. The films perform better than competing materials (e.g. PZT and SrTiO3-based) while being Pb-free and while operating up to 350 °C, which SrTiO3-based systems do not. Our work gives considerable promise for high energy and power density capacitors for harsh environments.
URI
https://scholarworks.unist.ac.kr/handle/201301/31149
URL
https://www.sciencedirect.com/science/article/pii/S2211285520300938
DOI
10.1016/j.nanoen.2020.104536
ISSN
2211-2855
Appears in Collections:
MSE_Journal Papers
Files in This Item:
There are no files associated with this item.

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU