Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/76302
Title: Colossal permittivity of (Mg plus Nb) co-doped TiO2 ceramics with low dielectric loss
Authors: Yang, C
Tse, MY 
Wei, XH
Hao, JH 
Issue Date: 2017
Publisher: Royal Society of Chemistry
Source: Journal of materials chemistry C, 2017, v. 5, no. 21, p. 5170-5175 How to cite?
Journal: Journal of materials chemistry C 
Abstract: A high dielectric loss is one of the difficulties that hinder the application of colossal permittivity (CP) materials. Here we report the CP behaviors in ceramics of rutile (Mg + Nb) co-doped TiO2, i.e., (Mg1/3Nb2/3)(x)Ti1-xO2. The room-temperature dielectric properties of the pure homogenous ceramics include a relatively high CP (>10(4)) and an acceptable dielectric loss (<0.1) at frequencies from 10(2) to 10(5) Hz in the doping concentration range of 0.5% to 7%. In particular, an excellent low dielectric loss of 0.0083 and a high dielectric permittivity of 3.87 x 10(4) at 1 kHz were obtained for the 1% doped sample. Moreover, the temperature stability (room temperature similar to 180 degrees C) and frequency stability (10(2)-10(5) Hz) of the CP properties were studied. X-ray photoelectron spectroscopy suggests that the superior CP properties could be explained by the electron-pinned defect-dipole mechanism.
URI: http://hdl.handle.net/10397/76302
ISSN: 2050-7526
EISSN: 2050-7534
DOI: 10.1039/c7tc01020f
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