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Accession number;06A0198120
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| Title;Disorder and Diffusion Path of Mobile Ions in Ionic Conductors-Neutron Diffraction Studies- |
| Author;
YASHIMA MASATOMO
(Interdisciplinary Graduate School of Sci. Engineering, Tokyo Inst. Technol., JPN)
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Journal Title;Journal of the Crystallographic Society of Japan
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Journal Code:G0232A
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ISSN:0369-4585
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VOL.48;NO.1;PAGE.25-29(2006)
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| Figure&Table&Reference;FIG.4, REF.19 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;We review our recent works on the positional disorder and diffusion path of mobile ions in fast ionic conductors Bi1.4Yb0.6O3 and La0.62Li0.16TiO3. These were studied through the nuclear density distribution obtained by a combined technique including the Rietveld refinement, the maximum-entropy method (MEM) and MEM-based pattern fitting of neutron powder diffraction data. The oxide ions in the fluorite-structured Bi1.4Yb0.6O3 have a complicated disorder spreading over a wide area, shift to the (111) directions from the ideal fluorite position and diffuse along the (100) directions. At 77K, the Li cations in the La0.62Li0.16TiO3 perovskite are located at the 2c site (Wycoff notation of the Cmmm space group) on the (002) La deficient layer, while at room temperature, they spread over a wide area and migrate following the 2c-4f-2c or 2c-2d-2c tie line on the (002) layer. (author abst.) |
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