Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/33427
Title: Fine grained Ba 1-xSr xTiO 3 ceramics by spark plasma sintering
Authors: Tian, H
Chen, W
Buckley, CE
Chan, HLW 
Keywords: Nanoscaled Ba 0.75Sr 0.25TiO 3 powder
SPS
Tunability
Issue Date: 2008
Publisher: American Scientific Publishers
Source: Journal of nanoscience and nanotechnology, 2008, v. 8, no. 11, p. 5908-5912 How to cite?
Journal: Journal of nanoscience and nanotechnology 
Abstract: Fine grained Ba 0.75Sr 0.25TiO 3 (BST) ceramics were prepared via spark plasma sintering technique. BST nano-powders freshly prepared by a low-temperature direct solution synthesis technique were used as starting materials. X-ray diffraction measurements indicated that the ceramics had a pure perovskite phase and the observation under scanning electron microscope revealed that the ceramic had a grain size in the range of 50 to 300 nm. The dielectric properties of the fine-grained BST ceramics were determined at different temperatures and frequencies. At room temperature, the ceramics exhibited a moderate dielectric constant (3962 ± 10), a good dielectric tunability (53.84% under a dc bias of 19.72 kV/cm). The highest tunability and figure of merit (FOM) values are 83.27% at 50.2°C and 289.28 at 62.3°C, respectively. These results suggested that the BST ceramics are suitable for use in tunable microwave devices.
URI: http://hdl.handle.net/10397/33427
ISSN: 1533-4880 (print)
DOI: 10.1166/jnn.2008.234
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