The effect of CuO additions on the firing temperature of ZnNb2O6 ceramics was investigated using dilatometry, transmission electron microscopy, and X-ray diffractometry. A 5 wt% CuO addition to ZnNb2O6 ceramics significantly lowered the firing temperature from 1150° to ∼900°C. The presence of a CuO-rich intergranular phase in the specimen was observed and was evidence of the formation of a liquid phase during sintering. The composition of the liquid phase was (ZnCu2)Nb2O8. In particular, the low-fired ZnNb2O6 ceramics had good microwave dielectric characteristics - Q × f = 59 500, εr = 22.1, τr = -66 ppm/°C. These properties were correlated with the formation of a second phase, (ZnCu2)Nb2O8.
|Number of pages||5|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 2001 Jun|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry