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Rhombohedral-cubic transition in Li0.2Na0.3La0.5TiO3 perovskite |
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| Authors: | Alejandro Varez Jesus Sanz |
| Institution: | a Dpt Materials Science and Engineering, Universidad Carlos III de Madrid, E-28911 Leganés, Spain b Institut Laue-Langevin, F-38045 Grenoble, France c Instituto de Ciencia de Materiales, CSIC, Cantoblanco, E-28049 Madrid, Spain |
| Abstract: | High-temperature behavior of the fast ionic conductor Li0.2Na0.3La0.5TiO3 has been investigated by neutron powder diffraction between 300 and 1073 K. The Rietveld analysis of diffraction patterns showed around 1000 K a change from rhombohedral ( ) to cubic ( ) symmetry. During the heating, the tilting of octahedra along the 111] direction of the cubic perovskite decreased and the rhombic distortion of oxygen square windows that relates contiguous A-sites of the perovskite was eliminated. The influence of the octahedral tilting on Li mobility is finally discussed. |
| Keywords: | Lanthanum lithium titanate High temperature neutron diffraction Perovskite structure Rhombohedral-cubic transition |
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