Fine grained Ba(1-x)Sr(x)TiO3 ceramics by spark plasma sintering.
J Nanosci Nanotechnol
; 8(11): 5908-12, 2008 Nov.
Article
em En
| MEDLINE
| ID: mdl-19198325
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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MEDLINE
Assunto principal:
Titânio
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Cerâmica
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Compostos de Bário
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Cristalização
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Nanotecnologia
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Nanoestruturas
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article