Chemical processing and dielectric properties of BaTiO{sub 3} ceramics
- Shonan Institute of Technology, Fujisawa (Japan)
- National Defense Academy, Yokosuka (Japan)
BaTiO{sub 3} powders were prepared at room temperature by the hydrolysis of a Ba-Ti solution, which was obtained by mixing titanium isopropoxide and a methanol suspension of barium hydroxide. As-prepared powders were crystalline with the average particle size of less than 30nm. The crystallinity and dielectric properties of as-prepared BaTiO{sub 3} powders depended upon the amount of water. Highly crystalline BaTiO{sub 3} powders were obtained, when the hydrolysis of Ba-Ti solution was performed with excess amount of water (molar ratio of H{sub 2}O/alkoxide {ge} 60). BaTiO{sub 3} ceramics from the powders obtained with H{sub 2}O/alkoxide=60 exhibited a dielectric constant of about 4500 and loss tangent of about 0.02. The micro- structure exhibited the bimodal grain structure consisting of exaggerated grains (>50 {mu} m) and small grains (about 1 {mu} m).
- OSTI ID:
- 99197
- Report Number(s):
- CONF-940911--
- Country of Publication:
- United States
- Language:
- English
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