Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/62235
Title: High-performance colossal permittivity materials of (Nb + Er) co-doped TiO2 for large capacitors and high-energy-density storage devices
Authors: Tse, MY
Wei, X
Hao, J 
Issue Date: 2016
Source: Physical chemistry chemical physics, 2016, v. 18, no. 35, p. 24270-24277
Abstract: The search for colossal permittivity (CP) materials is imperative because of their potential for promising applications in the areas of device miniaturization and energy storage. High-performance CP materials require high dielectric permittivity, low dielectric loss and relatively weak dependence of frequency- and temperature. In this work, we first investigate the CP behavior of rutile TiO2 ceramics co-doped with niobium and erbium, i.e., (Er0.5Nb0.5)xTi1-xO2. Excellent dielectric properties were observed in the materials, including a CP of up to 104-105 and a low dielectric loss (tanĪ“) down to 0.03, which are lower than that of the previously reported co-doped TiO2 CP materials when measured at 1 kHz. Stabilities of frequency and temperature were also accomplished via doping Er and Nb. Valence states of the elements in the material were analyzed using X-ray photoelectron spectroscopy. The Er induced secondary phases were observed using elemental mapping and energy-dispersive spectrometry. Consequently, this work may provide comprehensive guidance to develop high-performance CP materials for fully solid-state capacitor and energy storage applications.
Publisher: Royal Society of Chemistry
Journal: Physical chemistry chemical physics 
ISSN: 1463-9076
EISSN: 1463-9084
DOI: 10.1039/c6cp02236g
Rights: The article is licensed under a Creative Commons Attribution 3.0 Unported (CC BY 3.0) <https://creativecommons.org/licenses/by-nc/3.0/>
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