Microstructure and microwave dielectric properties of Ba(Co1/3Nb2/3)O3 ceramics

被引:31
作者
Ahn, CW
Nahm, S
Lim, YS
Choi, W
Park, HM
Lee, HJ
机构
[1] Korea Univ, Dept Mat Sci & Engn, Sungbuk Ku, Seoul 136701, South Korea
[2] Korea Res Inst Stand & Sci, New Mat Evaluat Ctr, Taejon 305600, South Korea
[3] Adv Mat Technol, Seocho Ku, Seoul 137030, South Korea
[4] Myongji Univ, Dept Ceram Engn, Yongin 449728, Kyunggi Do, South Korea
来源
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2002年 / 41卷 / 08期
关键词
Ba(Co1/3Nb2/3)O-3 ceramics; microstructure; microwave dielectric properties; 1 : 2 ordering;
D O I
10.1143/JJAP.41.5277
中图分类号
O59 [应用物理学];
学科分类号
摘要
Ba(Co1/3Nb2/3)O-3 (BCN) ceramics has a I : 2 ordered hexagonal structure and the degree of the I : 2 ordering slightly decreased When the sintering temperature exceeded 1400degreesC. A large amount of the liquid phase was found in the BCN ceramics sintered above 1400degreesC the formation of which is related to the evaporation of CoO. The liquid phase contains high concentrations of Ba and Nb ions. The grain size increased for the specimens sintered above 1400degreesC due to the presence of the liquid phase during the sintering. The Q-value of BCN increased with increasing sintering temperature and the specimen sintered at 1400degreesC had the maximum Q-value. When the sintering temperature exceeded 1400degreesC, however, the Q-value significantly decreased. The presence of a large amount of liquid phase could be responsible for the decrease of the Q-value. BCN ceramics were also sintered for various times at 1400degreesC and 1450degreesC and the variations of the microwave dielectric properties were explained in terms of the grain size and the relative density.
引用
收藏
页码:5277 / 5280
页数:4
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