| PMN-PT-BT/Ag 복합체 제조 및 기계적, 유전적 특성 |
| 임경란, 정순용1, 김창삼, 남산1 |
한국과학기술연구원 재료연구부
1고려대학교 재료공학과 |
| Preparation of PMN-PT-BT/Ag Composite and its Mechanical and Dielectric Properties |
| Kyoung-Ran Lim, Soon-Yong Jeong1, Chang-Sam Kim, Sahn Nahm1 |
Division of Materials Science and Engineering, KIST
1Department of Materials Science and Engineering, Korea University |
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| ABSTRACT |
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ure of PbO, $N_2O_5,;TiO_2;with;Mg(NO_3)_2$ instead of MgO was ball milled, the solvent was removed and then the dried powders were calcined at 950$^{circ}C$/1h. The calcined powder were treated with 3.0 mol% $Ag_2O$ and 1.0 wt% MgO sol and calcined at 550$^{circ}C$/1h. The dielectrics sintered at 1000$^{circ}C$/4h under a flowing oxygen showed the density of 7.84g/$cm^3$, the room temperature dielectric constant of 18400, the dielectric loss of 2.4%, the specific resistivity of $0.24{times}10^{12}{Omega}{cdot}cm$. It also showed the bending strength of $120.7{pm}11.26$ MPa and the fracture toughness of $0.87{pm}0.002;MPam^{1/2}$ which were comparable to commercial PZT. The microstructure sonsisted of grains of ∼4${mu}m$. SEM and SIMS analysis showed that Ag grew as ∼1${mu}m$ and excess MgO as ∼0.5${mu}m$. |
| Key words:
PMN-PT-BT, $Ag_2O$, Perovskite, MgO sol, Bending strength, Surface-modification |
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