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Journal of the Korean Ceramic Society 1996;33(4): 448. |
| $BaTiO_3$ 요업체에서 Cubic-Hexagonal 상전이에 따른 미세조직 변화 |
| 이태헌, 이정아 |
| 경북대학교 무기재료공학과 |
| Microstructural Evolution of $BaTiO_3$ Ceramics during the Cubin-Hexagonal Phase Transformation |
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| ABSTRACT |
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The microstructural evolution of BaTiO3 ceramics during cubic-hexagonal phase transformation was investiga-ted. In the case of phase transformation from cubic to hexagonal BaTiO3 the hexagonal phase nucleated at the surface region of specimen. On the other hand in the case of that from hexgonal phase to cubic, cubic phase was initiated at the center region of specimen. And fast grain growth and irregular grain boundary shape could be also observed during these transformation processes. Besides low densified hexagonal BaTiO3 specimen was made with low forming pressure. The phase transformation of these specimens toward cubic phase was relatively retarded comparing with dense hexagonal BaTiO3 specimens. was made low forming pressure.. The phase transformation of these specimens toward cubic phase was relatively retarded comparing with dense hexagonal BaTiO3 specimens. These results were explained that hexagonal BaTiO3 had lowder surface energy than cubic phase, |
| Key words:
$BaTiO_3$, Cubic-hexagonal phase transformation, Surface energy |
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