Fe/Ga order in Na3Fe5-xGaxO9
As part of an ongoing project looking at Li-ion battery cathode materials, we have been studying materials of composition Li3Fe5-xGaxO9. The phases are prepared via the low-temperature Li-for-Na cation exchange of the corresponding Na3Fe5-xGaxO9 compounds. We observe that samples with x < 2 the cation exchange works smoothly, as does oxidative deintercalation of Li. However for samples with x > 3, LiFe3O8 is produced on cation exchange. In addition there is a sharp change in the lattice parameters of Na3Fe2Ga3O9 (x = 3), compared to Na3Fe3Ga2O9 (x = 2). We think these changes are due to Fe/Ga cation order. However, we cannot characterize the Fe/Ga order in the system by X-ray diffraction due to the similar X-ray scattering powers of Fe and Ga. The neutron scattering lengths of Fe (9.45 fm) and Ga (7.28 fm) differ by 30%, so neutron diffraction data can be used effectively to determine the Fe/Ga order in the two samples. We therefore propose to collect room temperature neutron powder diffraction data from Na3Fe2Ga3O9 and Na3Fe3Ga2O9 to characterise the cation order in the phases and any other structural differences which could account for their differing cation exchange chemistry.
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The recommended format for citing this dataset in a research publication is in the following format:
Michael A Hayward and SUARD Emmanuelle. (2021). Fe/Ga order in Na3Fe5-xGaxO9. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-1051
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