Article

Fine grained Ba(1-x)Sr(x)TiO3 ceramics by spark plasma sintering.

Departement of Imaging and Applied Physics, Curtin University of Technology, GPO Box U 1987, Perth 6845, WA, Australia.
Journal of Nanoscience and Nanotechnology (impact factor: 1.56). 12/2008; 8(11):5908-12. pp.5908-12
Source: PubMed

ABSTRACT Fine grained Ba(0.75)Sr(0.25)TiO3 (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 degrees C and 289.28 at 62.3 degrees C, respectively. These results suggested that the BST ceramics are suitable for use in tunable microwave devices.

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Keywords

BST nano-powders freshly
 
dc bias
 
dielectric properties
 
FOM
 
frequencies
 
good dielectric tunability
 
low-temperature direct solution synthesis technique
 
moderate dielectric constant
 
plasma sintering technique
 
pure perovskite phase
 
tunable microwave devices
 
X-ray diffraction measurements
 

Huyong Tian