Interfacial Structure of Disordered-Ordered Domain Boundaries in Lanthanum-Doped Barium Magnesium Niobate |
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| Authors: | Hwack Joo Lee Hyun Min Park Hyun Ryu Jong Hoo Paik Sahn Nahm Jae-Dong Byun |
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| Affiliation: | New Materials Evaluation Center, Korea Research Institute of Standards and Science, Taeduk Science Town, Taejon 305–600, Korea;Division of Materials and Metallurgical Engineering, Korea University, Seoul 136–701, Korea |
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| Abstract: | Microstructural studies on the interfacial boundaries of disordered and 1:2 ordered domains in lanthanum-doped (Ba0.975La0.025)(Mg0.34Nb0.66)O3 were performed using high-resolution transmission electron microscopy and synchrotron powder X-ray diffractometry. Disordered and 1:2 ordered domains both coexisted in a single grain. Each domain occupied its own region, and the interfaces were atomically sharp and coherent. The wavelength of the superlattice modulation in the 1:2 ordered domain was ～0.71 nm. The transition from the 1:2 ordered region to the disordered one could be differentiated at the interface by using the superlattice modulations in the 1:2 ordered domain. From these observations, a deducible interfacial model also was presented. |
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