| Pb(Zn, Mg)_{1/3}Nb_{2/3}O_3$계에서 Columbite Precursors의 화학적 특성이 상생성, 미세화학 및 유전특성에 미치는 영향 |
| 조성률, 이규만, 장현명 |
| 포항공과대학 재료공학과 정밀세라믹스 공정과학연구실 |
| Effects of the Columbite Precursors on Phase-Formation Characteristics, Microchemistry and Dielectric Properties of Pb(Zn, Mg)_{1/3}Nb_{2/3}O_3$ Ceramics |
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| ABSTRACT |
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The mechanism of formation of perovskite phase and the dielectric properties of PZMN[Pb(Zn, Mg)1/3Nb2/3O3] ceramics were examined using two different types of the columbite precursors, (Mg, Zn)Nb2O6 (MZN) and MgNb2O6＋ZnNb2O6 (MN＋ZN). The formatin of perovskite phase in PbO＋MN＋ZN system is characterized by an initial rapid formation of Mg-rich perovskite phase, followed by a sluggish formation of Zn-rich perovskite phase. On the other hand, thepyrochlore/perovskite transformation in the PbO＋MZN system proceeded uniformly with a spatial homogeneity. The degree of diffuseness of the rhombohedral/cubic phase transitionis higher in the PbO＋MN＋ZN system than in the PbO＋MZN specimen, indicating a broadened compositional distributjion of the B-site catons (Nb+5, Zn+2, Mg+2) in the PbO＋MN＋ZN system. |
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