Structural Analysis of a New Layered Compound: La0.05Sr0.95MnO3 |
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| Authors: | Hiromi Nakano Takanori Mori Takayoshi Horikubi Naoki Kamegashira |
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| Affiliation: | Electron Microscope Laboratory and High-Tech Research Center, Ryukoku University, Seta, Otsu, 520-2194 Japan;Department of Materials Science, Toyohashi University of Technology, Tempaku-cho, Toyohashi, 441-8580 Japan |
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| Abstract: | We have found a new phase of La0.05Sr0.95MnO3 with a 30-layer rhombohedral structure by using electron microscopy. The lattice constants were hexagonal axes of a = 0.5444 nm and c = 6.7582 nm. Both weak and strong intensities appeared in selected area diffraction (SAD) patterns. The strong intensities were caused by the periodicity of 15 (Sr,La)O3 layers that had a new stacking sequence of (cchch)3. However, the weak intensities indicated that the 15-layer structure has modulation along the c -direction that is twice as long as that of the structure indicated by the strong intensities. We concluded that the modulation of the 30-layer structure was produced by the introduction of two kinds of oxygen octahedra, Mn3+O6 and Mn4+O6. |
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| Keywords: | structure layered ceramics lanthanum/lanthanum compounds |
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