Na diffusion in Na0.7CoO2 at high temperature
Understanding of Na-ion mobility in the layered NaxCoO2 family is very important for both applied as well as fundamental sciences. For x=0.7 we have found two structural phase transitions at about 290 and 400K, strongly coupled to Na diffusion. Above 400K a quasielastic signal could be measured at MARS, PSI. The data analysis is however ambiguous. High quality diffraction experiment suggests, that in this temperature range 2D Na diffusion occures on its hexagonal sublattice. But it is also possible that Na motion is complexer as thought and local motion is measured at MARS. We would like to investigate the quasielastic scattering above 400K with an energy resolution of 1 (or maximum 10) microeV. First choice for this study is IN16b, where we apply for 3 days of beam time. Alternatively IN5 could be also considered.
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JURANYI Fanni; GAVILANO Jorge; MANSSON MARTIN; MEDARDE BARRAGAN Maria Luisa and SEYDEL Tilo. (2015). Na diffusion in Na0.7CoO2 at high temperature. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-03-145
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