Hydrides of the Zintl phase TmGa
The formation and decomposition of hydrides of the Zintl phase TmGa (CrB type struture) will be studied by in situ neutron powder diffraction. Two hydrides TmGaHx are known, a stuffed CrB type hydride and a presumably hydrogen-richer hydride with a three-fold superstructure of the CrB type. A user-supplied gas-pressure cell with laser heating installed on D20 will provide the means to collect diffraction patterns as a function of temperature (up to 700 K) and deuterium gas pressure (up to 10 bar) with a time resolution of two minutes. This will allow to identify intermediates including deuterium positions and occupation in the crystal structures (by Rietveld refinement). The structural information will foster understanding of the chemical oxidation of polyanions in Zintl phases by hydrogen and the clarify open questions about the chemical bonding situation.
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Holger Kohlmann; FINGER Raphael; GOETZE André; Thomas C. Hansen; PFLUG Christian and WERWEIN Anton. (2018). Hydrides of the Zintl phase TmGa. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-616
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