| Microstructure and Microwave Dielectric Properties of (1-x) Ba (Co1/3Nb2/3)O3-zBa(Zn1/3Nb2/3)O3 Ceramics |
| Byung-Guk Ahn, Cheol-Woo Ahn1, Sahn Nahm1, Hwack-Joo Lee2 |
Faculty of New Materials Engineering, Chonbuk National University
1Department of Material Science and Engineering, Korea University
2New Materials Evaluation Center, Korea Research Institute of Standards and Science |
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| ABSTRACT |
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Ba (Co$_{1}$ 3/Nb$_{2}$ 3/)O$_3$(BCN) has a 1:2 ordered hexagonal structure. Q-value of BCN increased with increasing sintering temperature however, it significantly decreased when the sintering temperature exceeded 140$0^{circ}C$ Ba (Co$_{1}$ 3/Nb$_{2}$ 3/)O$_3$(BZN) has the 1:2 ordered hexagonal structure and the degree of the 1 : 2 ordering decreased with the increase of the sintering temperature. The Q value of the BZN increased with increasing the sintering temperature and BZN sintered at 140$0^{circ}C$ for 6h has a maximum Q-value. For (1-x) Ba (Co$_{1}$ 3/Nb$_{2}$ 3/)O$_3$-zBa(Zn$_{1}$ 3/Nb$_{2}$ 3/)O$_3$[(1-x)BCN-xBZN] ceramics the 1:2 ordered hexagonal structure was observed in the specimens with x$leq$0.3 and the BaNb$_{6}$ O$^{16}$ second phase was found in the specimens with x$geq$0.6. Grain Growth, which is rotated to the BaNb$_{6}$ O$^{16}$ second phase occurred in the specimens with x$geq$ 0.5. In this work, the excellent microwave dielectric properties of $tau$r=0.0 ppm/$^{circ}C$$varepsilon$r=34.5 and Q,$times$f=97000GHz sere obtained for the 0.7BCV-0.3BZN ceramics sintered at 1400$0^{circ}C$ for 20h. |
| Key words:
Microstructure, Microwave dielectric properties, Niobates |
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