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Issue 35, 2015
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Retracted Article: Origin of colossal permittivity in (In1/2Nb1/2)TiO2via broadband dielectric spectroscopy

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Abstract

(In1/2Nb1/2)TiO2 (IN-T) ceramics were prepared via a solid-state reaction route. X-ray diffraction (XRD) and Raman spectroscopy were used for the structural and compositional characterization of the synthesized compounds. The results indicated that the sintered ceramics have a single phase of rutile TiO2. Dielectric spectroscopy (frequency range from 20 Hz to 1 MHz and temperature range from 10 K to 270 K) was performed on these ceramics. The IN-T ceramics showed extremely high permittivities of up to ∼103, which can be referred to as colossal permittivity, with relatively low dielectric losses of ∼0.05. Most importantly, detailed impedance data analyses of IN-T demonstrated that electron-pinned defect-dipoles, interfacial polarization and polaron hopping polarization contribute to the colossal permittivity at high temperatures (270 K); however, only the complexes (pinned electron) and polaron hopping polarization are active at low temperatures (below 180 K), which is consistent with UDR analysis.

Graphical abstract: Retracted Article: Origin of colossal permittivity in (In1/2Nb1/2)TiO2via broadband dielectric spectroscopy

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Article information


Submitted
12 May 2015
Accepted
21 Jul 2015
First published
30 Jul 2015

Phys. Chem. Chem. Phys., 2015,17, 23132-23139
Article type
Paper
Author version available

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