Abstract
The effect of Al2O3-doped silica glass (AS-glass) addition on the structure and dielectric properties of the BaO–Nd2O3–Sm2O3–TiO2 (BNST) microwave materials was investigated. This BNST material has a dielectric constant (k) of 80 and a quality factor (Q×f) of 6000 GHz when sintered at 1350 °C for 2 h. Both the microstructure and the microwave dielectric characteristics were determined as a function of the sintering temperature and glass content. A Q×f as high as 8700 GHz was achieved in ceramics added with 20 wt % glass, however, the k value drops to 30. The high Q×f value is attributed to the improved densification of the dielectric when glass is added. Results of X-ray diffraction experiments indicate that glass addition enhances the growth in the longitudinal direction of the columnar crystal and a preferred (0 0 2) orientation. The presence of columnar structure plays an important role in the improvement of the microwave dielectric properties.
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Chang, LC., Chiou, BS. & Lee, WH. Effect of glass additions on the sintering behaviors and electrical microwave properties of BaO–Nd2O3–Sm2O3–TiO2 ceramics. Journal of Materials Science: Materials in Electronics 15, 153–158 (2004). https://doi.org/10.1023/B:JMSE.0000011354.99189.b9
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DOI: https://doi.org/10.1023/B:JMSE.0000011354.99189.b9