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J. Korean Ceram. Soc. > Volume 40(4); 2003 > Article
Journal of the Korean Ceramic Society 2003;40(4): 365.
doi: https://doi.org/10.4191/kcers.2003.40.4.365
Sintering and Microwave Dielectric Properties Of Ba2Ti9O20 Ceramics Prepared by Precursor Method
Je-Hong Sung, Joon-Hyung Lee, Jeong-Joo Kim, Hee-Young Lee1, Sang-Hee Cho
Department of Inorganic Materials Engineering, Kyungpook National University
1School of Metallurgical and Materials Engineering, Yeungnam University
ABSTRACT
The phase development process of $Ba_2$ $Ti_{9}$ $O_{20}$ ceramics is not clearly known and frequently accompanies second phases which deteriorate dielectric properties. In synthesizing $Ba_2$ $Ti_{9}$ $O_{20}$ ceramics, in order to trace the reaction sequence during conventional solid-state reaction in BaO-Ti $O_2$ system, different barium sources of BaC0$_3$ and BaTi0$_3$ precursor were used as starting materials. From the analysis of XRD patterns, different secondary phases could be identified depending on the barium source used, which might mean that the equilibrium phases in BaO-Ti $O_2$ system are very difficult to be synthesized. Because the BaTi0$_3$ precursor provides short diffusion paths of ions, the system revealed less secondary phases during solid state reaction. In synthesizing BaO-xSm$_2$0$_3$-4.5Ti0$_2$ system using different barium sources, different secondary phases were developed also. Microstructure and dielectric properties were examined and discussed in terms of secondary phase development.
Key words: ${Ba_2}{Ti_9}{O_20}}$ Precursor, Microwave, Dielectric, Secondary phase
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