Publikationsdatum:
2018-01-20
Beschreibung:
Four MgO-Ta 2 O 5 ceramics with the MgO/Ta 2 O 5 mole ratio x=1, 2, 3 and 4 were prepared by traditional solid state reaction method, and the influence of x on the phase composition, microstructure and dielectric properties (the dielectric constant ε r , the temperature coefficient of resonant frequency τ f and the quality factor Qf) of the materials was investigated by using XRD, SEM, etc. The results indicated that the ceramics were composed of two crystalline phases MgTa 2 O 6 and Mg 4 Ta 2 O 9 in the composition range studied, and that the dielectric properties ln ε, 1/Qf and τ f changed proportionally to the fraction of main crystal phases, which meet perfectly with the mixing model proposed in this study. It is obvious that the proportion of the two crystal phases could be precisely controlled by x, and thereby, the dielectric properties can be conveniently and precisely tailored. Our research provided a new microwave dielectric ceramic with the composition of 2MgO-Ta 2 O 5 , which has an ultra-high Qf value (211 000 GHz), low dielectric constant ε r (19.9) and near zero temperature coefficient of resonant frequency τ f (8 ppm/°C). This article is protected by copyright. All rights reserved.
Print ISSN:
0002-7820
Digitale ISSN:
1551-2916
Thema:
Maschinenbau
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