In situ observation of hydrogen incorporation in LaGa2
The hydrogenation of Zintl phases was investigated recently because of interesting bonding properties of the corresponding hydrides and their use as hydrogen storage media. AlB2 related structures are known SrAl2H2, SrGa2H2 and SrAlSiH with covalent Al-H and Ga-H bonds. In contrast, LaGa2 takes up hydrogen and incorporates it in trigonal-bipyramidal La3Ga2 voids, where one site is occupied by 67% and the second by 4 %. LaGa2D0.7 is thus considered to be an interstitial hydride. We will observe the formation of LaGa2D0.71 in situ and look for further phases under hydrogen pressure. The preliminary classification as an interstitial hydride suggests a phase width with respect to hydrogen, which will be mapped in the in situ experiment. This experiment will help to understand the influence of the ionic charge and valence-electron concentration for the formation of different Zintl phase hydrides.
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Holger Kohlmann; FINGER Raphael; GOETZE André; Thomas C. Hansen; KEILHOLZ Simon and WERWEIN Anton. (2019). In situ observation of hydrogen incorporation in LaGa2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-22-767
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