Controlled Temperature Coefficient of Resonant Frequency of Al 2 O 3 -TiO 2 Ceramics by Annealing Treatment
The microwave dielectric properties of alumina (Al 2 O 3 ) ceramics were studied. Our objective was to improve the large negative temperature coefficient of resonant frequency (τ f = -60 ppm/°C) of Al 2 O 3 ceramics by the adding rutile (TiO 2 ) with a large positive τ f (+450 ppm/°C). A near-zero τ...
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| Veröffentlicht in: | Japanese Journal of Applied Physics 2004-06, Vol.43 (6A), p.L749 |
|---|---|
| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | eng |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | The microwave dielectric properties of alumina (Al
2
O
3
) ceramics were studied. Our objective was to improve the large negative temperature coefficient of resonant frequency (τ
f
= -60 ppm/°C) of Al
2
O
3
ceramics by the adding rutile (TiO
2
) with a large positive τ
f
(+450 ppm/°C). A near-zero τ
f
(τ
f
= +1.5 ppm/°C) with excellent microwave dielectric properties (
Q
·
f
= 117,000 GHz,
ε
r
= 12.4) was obtained in 0.9Al
2
O
3
-0.1TiO
2
ceramics sintered at 1350°C for 2 h, followed by annealing at 1000°C for 2 h in air. |
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| ISSN: | 0021-4922 1347-4065 |
| DOI: | 10.1143/JJAP.43.L749 |