Abstract
Ba(Co1/3Nb2/3)O3(BCN) has a 1:2 ordered hexagonal structure. A large amount of the liquid phase, which contains high concentrations of Ba and Nb ions was found in the BCN ceramics. Q-values of BCN increased with increasing sintering temperature; however, it significantly decreased when the sintering temperature exceeded 1400 °C. The presence of a large amount of liquid phase could be responsible for the decrease of the Q-value. For (1 - x)Ba(Co1/3 Nb2/3)O3-xBa(Zn1/3Nb2/3) O3[(1 - x)BCN-xBZN] ceramics, the 1:2 ordered hexagonal structure was observed in the specimens with x ≤ 0.3 and the BaNb6O16 second phase was found in the specimens with x ≥ 0.6. Grain growth, which is related to the BaNb6 O16 second phase occurred in the specimens with x ≥ 0.5. In this work, the excellent microwave dielectric properties of τf = 0.0 ppm/°C, εr = 34.5 and Q × f = 97,000 GHz were obtained for the 0.7BCN-0.3BZN ceramics sintered at 1400 °C for 20 h.
Original language | English |
---|---|
Pages (from-to) | 2473-2478 |
Number of pages | 6 |
Journal | Journal of the European Ceramic Society |
Volume | 23 |
Issue number | 14 |
DOIs | |
Publication status | Published - 2003 |
Keywords
- Dielectric properties
- Microstructure-final
- Niobates
- Perovskite
- Sintering
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry