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Erschienen in:
01.05.2015
Low temperature sintering and microwave dielectric properties of the LBSCA-doped (Zn0.95Co0.05)2SiO4 ceramics
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 5/2015
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Abstract
The (Zn0.095Co0.05)2SiO4 powers were fabricated through a traditional solid-state preparation process. Li2O–B2O3–SiO2–CaO–Al2O3 (LBSCA) glass was successfully developed as a low-doped sintering aid and it was found that LBSCA glass could significantly lower the sintering temperature of the synthesized powers from 1,300 °C to around 900 °C. Only 1 wt% of LBSCA-doping contributed to a 24.9 % increase of the relative density. X-ray diffraction spectra indicated that pure willemite phase was obtained. Scanning electron microscope images demonstrated that low LBSCA-doping (≤2 wt%) promoted the grain densification and uniformity of the specimens. A dense microstructure with uniform grain size could be obtained with 2 wt% LBSCA and sintered at 900 °C. The specimen also presented high microwave dielectric properties: ε
r
= 6.5, Q × f = 57,000 GHz and τ
f
= −55 ppm/°C.