Electrical and electron paramagnetic resonance spectroscopy characterization of Mn-doped nanostructured TiO2 for capacitor applications
Journal
Journal of Power Sources
Journal Volume
210
Pages
21-25
Date Issued
2012
Author(s)
Abstract
Nanostructured TiO 2 has shown promise as a dielectric material for high energy density ceramic capacitors because of its high dielectric breakdown strength and dielectric constant. Strategies to increase the insulation resistance or to reduce the leakage current of TiO 2 include doping with transition metal ions. It is shown that Mn doping followed by an appropriate thermal treatment increases the grain boundary resistivity significantly and lowers the dielectric loss. Electrical measurements along with electron paramagnetic resonance and scanning electron microscopy of Mn-doped nanoscopic TiO 2 demonstrate that sintering at 900 °C leads to optimal electrical properties that are correlated with a non-uniform distribution of dopant ions, concentrated at the grain boundaries. Nanostructured TiO 2 dielectrics with improved insulation resistance are promising for the development of higher energy density capacitors. © 2012 Elsevier B.V. All rights reserved.
SDGs
Type
journal article