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J. Korean Ceram. Soc. > Volume 40(4); 2003 > Article
Journal of the Korean Ceramic Society 2003;40(4): 333.
doi: https://doi.org/10.4191/kcers.2003.40.4.333
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
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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