Formation and decomposition of deuterides of the Zintl phases KSi and CsGe
The hydrogenation (deuteration) of the Zintl phases KSi and CsGe will be followed under in situ conditions by neutron powder diffraction in a user provides sapphire single crystal cell. In situ X-ray powder diffraction at 80 bar H2 pressure showed the formation of KSiH3 at 110°C and K8Si46 at 200 °C. The neutron diffraction experiment addresses a possible homogeneity range of KSiH3-x during the formation. In advance the clathrate phase K8Si46 will be investigated in regard of trapped H2 (D2) molecules as indicated in the literature. Since the system KSi/KSiH3 is reversible, the dehydrogenation step under vacuum will be followed as well. CsGe as a homologue compound shows a similar behavior with the formation of a clathrate phase. The hydrogenation (deuteration) products will be fully structurally characterized. This will gain insight into the bonding behavior of the Zintl anions, especially in their interaction with hydrogen atoms.
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Holger Kohlmann; AUER Henry; GOETZE André; Thomas C. Hansen and WERWEIN Anton. (2015). Formation and decomposition of deuterides of the Zintl phases KSi and CsGe. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-21-1096
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