High-performance colossal permittivity materials of (Nb + Er) co-doped TiO2for large capacitors and high-energy-density storage devices

Mei Yan Tse, Xianhua Wei, Jianhua Hao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

57 Citations (Scopus)

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 TiO2ceramics 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 104-105and a low dielectric loss (tanδ) down to 0.03, which are lower than that of the previously reported co-doped TiO2CP 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.
Original languageEnglish
Pages (from-to)24270-24277
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume18
Issue number35
DOIs
Publication statusPublished - 1 Jan 2016

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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