Crystal structures of the hydride oxides LiLaEuH2O2, SmHO and their deuterides
Mixed anionic metal hydrides, especially hydride oxides, have attracted attention recently as functional materials. For example, LiEu2HOCl2 and terbium doped GdHO were found to exhibit photoluminescence. The crystal structure of two further hydride oxide, LiLaEuH2O2 and SmHO will be determined by neutron powder diffraction, which is needed in order to unambiguously locate lithium and hydrogen atoms. The metal atom substructures were determined by X-ray diffraction and show similarities to those of LiLaSrH2O2 and SmH2. While for metal hydrides usually only deuterides are investigated with neutron diffraction in order to avoid the strong incoherent scattering of 1H, in this case both hydrides and deuterides will be measured. This is because for both compounds H/O disorder is possible and the scattering lengths of D and O atoms are very similar. Because of the strong neutron absorption of Sm and Eu the wavelengths will be chosen carefully (70 pm for Eu and 50 pm for Sm samples). The location of hydrogen atoms will complete the crystal structures and allow to explain the properties of these compounds, e. g. photoluminescence, ionic conductivity and chemical reactivity.
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Holger Kohlmann; CUELLO Gabriel; Henry E. Fischer; HOSLAUER Jean-Louis; RUDOLPH Daniel; SCHLEID Thomas and ZAPP Nicolas. (2020). Crystal structures of the hydride oxides LiLaEuH2O2, SmHO and their deuterides. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-22-775
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