Issue 11, 2015

Colossal permittivity in ceramics of TiO2 Co-doped with niobium and trivalent cation

Abstract

The appearance of colossal permittivity (CP) materials broadens the choice of materials for energy-storage applications. Here we report colossal permittivity in ceramics of TiO2 co-doped with niobium and trivalent cation {i.e., (A0.5Nb0.5)xTi1−xO2, A = Bi, Pr, Dy, Sm, Gd, Yb, Ga, Al or Sc}, in particular in the (Bi0.5Nb0.5)xTi1−xO2 ceramic system that was selected as a candidate material. A very large dielectric constant (εr ∼ 4.2 × 104) and a low dielectric loss (tan δ ∼ 8.3%) were observed for (Bi0.5Nb0.5)xTi1−xO2 ceramics when measured at 1 kHz. Moreover, the addition of Bi and Nb can enhance the temperature stability (between −125–200 °C) and frequency stability (between 102 to 106 Hz) of εr and tan δ. The electron-pinned defect-dipoles are considered to be responsible for both their high εr and low tan δ, which is consistent with changes of valence states determined by X-ray photoelectron spectroscopy. We believe that the TiO2 ceramics as a CP material constitute one of the most promising candidates for high-energy-density storage applications.

Graphical abstract: Colossal permittivity in ceramics of TiO2 Co-doped with niobium and trivalent cation

Supplementary files

Article information

Article type
Communication
Submitted
07 Jan 2015
Accepted
28 Jan 2015
First published
28 Jan 2015

J. Mater. Chem. A, 2015,3, 5805-5810

Colossal permittivity in ceramics of TiO2 Co-doped with niobium and trivalent cation

X. Cheng, Z. Li and J. Wu, J. Mater. Chem. A, 2015, 3, 5805 DOI: 10.1039/C5TA00141B

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