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Synthesis and Crystal-Structure Analysis of the K2NiF4-Type Hydride Oxides LiLnEuH2−xO2 (Ln=La, Ce, Pr, Nd, Sm) and LiEu2H3O by Neutron and X-Ray Diffraction

The hydride oxides LiLnEuH2−xO2 (Ln=La, Ce, Pr, Nd and Sm) were synthesized by reaction of the lanthanide sesquioxides with europium monoxide, europium dihydride and lithium hydride under inert conditions at 750 °C as black powders. They crystallize in the tetragonal K2NiF4-type structure (space group: I4/mmm) with a mixed Ln3+/Eu2+ occupation. The crystal structures of the europium representatives LiLaEuH2−xO2 and LiLaEuD2−xO2 were analyzed by powder neutron diffraction data at short wavelengths (λ=70 pm). Hydrogen (deuterium) and oxygen atoms occupy distinct crystallographic sites with considerable vacancy concentrations on the hydrogen positions (a=363.80(8) pm, c=1323.3(3) pm, c/a=3.637 for LiLaEuH1.26(4)O2 and a=363.43(5) pm, c=1321.6(2) pm, c/a=3.636 for LiLaEuD1.41(2)O2). Moving from the mixed Ln/Eu occupation in LiLnEuH2O2 to Ln=Eu2+, we obtained the mixed-anionic phase LiEu2H3O, which crystallizes in the same structure type with a=370.04(2) pm, c=1317.32(8) pm and c/a=3.560.

Identiferoai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:92780
Date25 July 2024
CreatorsHoslauer, Jean-Louis, Zapp, Nicolas, Fischer, Henry E., Rudolph, Daniel, Kohlmann, Holger, Schleid, Thomas
PublisherWiley-VCH
Source SetsHochschulschriftenserver (HSSS) der SLUB Dresden
LanguageEnglish
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text
Rightsinfo:eu-repo/semantics/openAccess
Relation0044-3506, e202200266, 10.1002/zaac.202200266

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