| PZT 세라믹스에서 $PbZrO_3$와 $PbTiO_3$ 첨가에 의한 입계이동과 입자모양 변화 |
| 허태무, 김재석, 이종봉, 이호용, 강석중1 |
선문대학교 재료금속공학부
1한국과학기술원 재료공학과 |
| Grain Boundary Migration and Grain Shape Change Induced by Alloying of $PbZrO_3$ and $PbTiO_3$ in PZT Ceramics |
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| ABSTRACT |
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When PbZrO3 (PZ) and PbTiO3 (PT) particles were scattered on polished surfaces of sintered Pb(Zr0.52Ti0.48)O3 (PZT; Zr/Ti=1.08) and then annealed, the PZT grain boundaries migrated. Near the scattered particles, grain boundaries were corrugated and thus the grain shape changed from a normal one to irregular ones. Especially, near the scattered PZ particles, fast grain growth occurred. In the regions swept by moving grain boundaries, the Zr/Tiratio was measured to be about 1.35 for of PZ scattering and about 0.8 for PT scattering, respectively. This result indicates that the grain boundary migration was induced by alloying of Zr and Ti ions in PZT grains, as in usual diffusion induced grain boundary migration(DIGM). A calculation showed that higher coherency strain energy was induced for PT scattering because of higher alloying of Ti than of Zr. |
| Key words:
Diffusion Induced Grain-Boundary migration, Coherency Strain Energy, Compositional Inhomogeneity, Grain Growth, PZT. |
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