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Erschienen in:
01.01.2013
Effect of Sb5+ substitution on the dielectric properties of Ba3LiTa3Ti5O21 ceramics
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 1/2013
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Abstract
The effects of substitution Sb for Ta on the sintering behavior and the microwave dielectric properties of Ba3LiTa3Ti5O21 ceramic were studied. Single-phase polycrystalline microwave dielectric ceramics Ba3LiTa3−x
Sb
x
Ti5O21(x = 0–3) were prepared by the solid-state reaction method. The sintering behavior and microwave dielectric properties of Ba3LiTa3−x
Sb
x
Ti5O21 ceramics were found to be affected by Sb substitution for Ta. With the increasing Sb content, the densified (>95 % of their theoretical X-ray density) temperatures of Ba3LiTa3−x
Sb
x
Ti5O21 ceramics increased from 1,160 to 1,220 °C, the dielectric constant (ε
r
) decreased from 55.5 to 27, and the Q × f value enhanced significantly from 18,480 to 29,400 GHz, with τ
f
improving from 70 to −25 ppm/°C. A near zero τ
f
value could be obtained by carefully adjusting the Sb content.