Effect of nonstoichiometry on the microstructure and dielectric properties of strontium titanate ceramics
authors Tkach, A; Vilarinho, PM; Senos, AMR; Kholkin, AL
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords electron microscopy; dielectric properties; SrTiO3; capacitors
keywords SOFT PHONON MODES; SRTIO3; FERROELECTRICITY
abstract Nonstoichiometric strontium titanate (ST) ceramics with precisely controlled Sr/Ti ratio of 0.997-1.02 were synthesised by solid state reaction. Structural properties and microstructure development was examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The dielectric properties were evaluated as a function of the temperature and frequency in the radio frequency range. The grain size was found to decrease dramatically with increasing Sr/Ti ratio > 1. The variation of Sr/Ti ratio has only weak effect on the quantum paraelectric behaviour of ST without any dielectric anomaly observed. The TiO2 excess promotes the increase of the dielectric permittivity values with loss factor similar to stoichiometric ST. Sri(1.01)TiO(3.01) composition exhibits much lower loss, while the dielectric permittivity is somewhat below the values for stoichiometric ST ceramics. (c) 2005 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2005
volume 25
issue 12
beginning page 2769
ending page 2772
digital object identifier (doi) 10.1016/j.jeurceramsoc.2005.03.137
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000230569300164
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journal impact factor 3.794
5 year journal impact factor 3.536
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