The effects of ZnB2O4 glass additions on the sintering temperature and microwave dielectric properties of Ba3Ti5Nb6O28 have been investigated using dilatometer, X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and a network analyzer. The pure Ba3Ti5Nb6O28 system showed a high sintering temperature (1250 °C) and had the good microwave dielectric properties: Q × f of 10,600 GHz, εr of 37.0, τf of -12 ppm/°C. It was found that the addition of ZnB2O4 glass to Ba3Ti5Nb6O28 lowered the sintering temperature from 1250 to 925 °C. The reduced sintering temperature was attributed to the formation of ZnB2O4 liquid phase and B2O3-rich liquid phases. Also the addition of ZnB2O4 glass enhanced the microwave dielectric properties: Q × f of 19,100 GHz, εr of 36.6, τf of 5 ppm/°C. From XPS and XRD studies, these phenomena were explained in terms of the reduction of oxygen vacancies and the formation of secondary phases having the good microwave dielectric properties.
|Number of pages||5|
|Journal||Journal of the European Ceramic Society|
|Issue number||8-9 SPEC. ISS.|
|Publication status||Published - 2007 Apr 2|
- Low temperature sintering
ASJC Scopus subject areas
- Ceramics and Composites