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Erschienen in:
01.09.2013
Improved microwave dielectric properties of Mg4Nb2O9 ceramics with CaO–B2O3–SiO2 glass additions
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 9/2013
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Abstract
The effects of CaO–B2O3–SiO2 (CBS) glass addition on the sintering temperature and dielectric properties of Mg4Nb2O9 ceramics have been investigated using X-ray diffraction, Scanning electron microscopy and Differential thermal analysis. The CBS glass can change to liquid phase at about 750 °C and a small amount of CBS glass addition to Mg4Nb2O9 ceramics can greatly decrease the sintering temperature to about 1,125 °C. It is revealed that the reduced sintering temperature is attributed to the formation of liquid phase. The major phases of the sample are Mg4Nb2O9 and MgNb2O6. The relationship between τ
f
values and the content of glass additions have the reverse change trends. The Mg4Nb2O9 ceramics with 2wt% glass addition sintered 1,125 °C exhibit good microwave dielectric properties: dielectric constant (ε
r
) of 13 and Q·f value of 69,000 GHz.