| (001) Pb(Mg1/3Nb2/3)O3-x%PbTiO3 단결정의 도메인 구조 및 상전이 |
| 이은구 |
| 조선대학교 재료공학과 |
| Domain Structure and Phase Transformation of (001) Pb(Mg1/3Nb2/3)O3-x%PbTiO3 Single Crystals |
| Eun-Gu Lee |
| Department of Materials Engineering, Chosun University |
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| ABSTRACT |
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The domain structures, dielectric properties, and phase transformation of (001)-oriented $Pb(Mg_{1/3}Nb_{2/3})O_3-x%PbTiO_3$ (PMN-x%PT) crystals for x=20, 30, 35, and 40 mole% have been investigated. PMN-20%PT consists of polar nano-domains (PND) which do not self-assemble into macro-domain plates. PMN-30%PT consists of PNDs which begin to self-assemble into colonies along preferred {110} planes. PMN-35PT consists of miniature polar domains on the nm scale. PMN-40%PT consists of {001} oriented lamella domains on the mm scale that have internal nano-scale heterogeneities. The dielectric properties of poled (001) PMN-x%PT single crystals have been measured for orientations both parallel and perpendicular to the [001] poling direction. The results of the temperature dependence of the dielectric constant and mesh scans for the 30%PT sample demonstrate that the initial monoclinic phase changes to single domain tetragonal phase and to cubic phase with increasing temperature. |
| Key words:
Ferroelectrics, Domain, SFM, Phase transformation |
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