Improvement of the dielectric properties of Ta2O5 through substitution with Al2O3
1997; American Institute of Physics; Volume: 70; Issue: 11 Linguagem: Inglês
10.1063/1.119088
ISSN1520-8842
AutoresR. J. Cava, W. F. Peck, J. J. Krajewski, G. L. Roberts, Bradley P. Barber, H. M. O’Bryan, P. L. Gammel,
Tópico(s)Acoustic Wave Resonator Technologies
ResumoFor bulk ceramic materials, small substitutions of Al2O3 in Ta2O5 are shown to cause a moderate enhancement of the dielectric constant. For compositions near 0.95Ta2O5–0.05Al2O3, the temperature coefficient of the dielectric constant at 20 °C dramatically decreases, from more than 200 ppm/°C for pure Ta2O5 to less than 20 ppm/°C. The quality factors (Q) at 1 MHz, are 2000–5000. Measurements to 14 GHz at 20 °C show that the dielectric constant is maintained to microwave frequencies, with a Q of ∼600 at 5 GHz.
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