Effect of glass additions on the sintering and microwave properties of composite dielectric ceramics based on BaO–Ln2O3–TiO2 (Ln = Nd, La) |
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Authors: | Hong Zheng Ian M. Reaney Duncan Muir Tim Price David M. Iddles |
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Affiliation: | aDepartment of Engineering Materials, University of Sheffield, Sheffield S1 3JD, UK bFiltronic Comtek, Ceramics Division, Wolverhampton WV10 7DB, UK |
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Abstract: | Ten weight percent BBZS (Bi2O3, B2O3, ZnO and SiO2) glass was added to x(Ba4Nd9.333Ti18O54) − (1 − x)(BaLa4Ti4O15) (BNLT, 0 ≤ x ≤ 1) composite dielectric ceramics to lower their sintering temperature whilst retaining microwave properties useful for low temperature co-fired ceramic and antenna core technology. With the addition of 10 wt% BBZS glass, dense BNLT composite ceramics were produced at temperatures between 950 and 1140 °C, depending on composition (x), an average reduction of sintering temperature by 350 °C. X-ray diffraction, scanning and transmission electron microscopy and Raman spectroscopy studies revealed that there was limited inter-reaction between BLT/BNT and the BBZS glass. Microwave property measurement showed that the addition of BBZS glass to BNLT ceramics had a negligible effect on r and τf, although deterioration in the measured quality factor (Qf) was observed. The optimised composition (xBNT − (1 − x)BLT)/0.1BBZS (x = 0.75) had r 61, τf 38 ppm/°C and Qf 2305 GHz. |
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Keywords: | Dielectric ceramics Low-melting glass addition |
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