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Neutron diffraction study on protonated and hydrated layered perovskite |
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| Authors: | Shunsuke Nishimoto Stefanus Harjo Toru Ishigaki Michihiro Miyake |
| Affiliation: | a Department of Environmental Chemistry and Materials, Okayama University, Tsushima-Naka, Okayama 700-8530, Japan b Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan c Institute for Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan |
| Abstract: | A layered perovskite compound with Na+, D3O+ ions (H3O+) and D2O molecules (H2O) in the interlayer, DxNa1−xLaTiO4·yD2O, has been prepared by an ion-exchange/intercalation reaction with dilute DCl solution, using an n=1 Ruddlesden-Popper phase, NaLaTiO4. Its structure has been analyzed in order to clarify the interlayer structure by Rietveld method, using powder neutron diffraction data. The structure analysis revealed that the layered structure changed from the space group P4/nmm-I4/mmm after the ion-exchange/intercalation reaction, and it induced the transformation of perovskite layers from staggered to an eclipsed configuration. The D2O molecules and D3O+ ions loaded in the interlayer statistically occupied the sites around a body center position of rectangular space surrounded by eight apical O atoms of TiO6 octahedra in upper and lower layers. |
| Keywords: | Layered perovskite Ruddlesden-Popper phase Ion exchange Intercalation Hydration Crystal structure Neutron diffraction |
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