A series of BaAl2−xSixH2−x (0.4<x<1.6) hydrides with compositions and structures in between BaSi2 and BaAl2H2

Crystal structure evolution of complex metal aluminum hydrides upon hydrogen release

“…Another very interesting perspective for new applications is based on the development of compounds with the composition MAlSiH (with M: Sr, Ca, Ba). These compounds are polyanionic hydrides ("Zintl phase hydrides") with interesting properties [25][26][27] . They are air-and moisture-stable semiconductors with very high decomposition temperatures.…”

Two New Cluster Ions, Ga[GaH3]45– with a Neopentane Structure in Rb8Ga5H15 and [GaH2]nn– with a Polyethylene Structure in Rbn(GaH2)n, Represent a New Class of Compounds with Direct Ga–Ga Bonds Mimicking Common Hydrocarbons

“…The similarity with hydrocarbon structures may also open up the possibility of doping the new compounds with group IV elements or vice versa, which could lead to interesting electric properties. In the somewhat related series BaAl 2 H 2 /BaAlSiH/BaSi 2 , which is of interest for superconductivity, the continuous substitution of an Al–H entity with a Si lone pair could shift the electric conductivities to promote a semiconductor–semimetal transition …”

Revised electronic structure, Raman and IR studies of AB2H2and ABCH (A = Sr, Ba; B = Al, Ga; C = Si, Ge) phases

“…BaAl 2 H 2 , have not been observed experimentally, as all the synthesis attempts have proven so far to be unsuccessful. 15 In the present study we assume that BaAl 2 H 2 also stabilize in a similar structure as the other iso-electronic compounds in the AB 2 H 2 series. SrAl 2 H 2 , BaGa 2 H 2 , and SrGa 2 H 2 are stabilizing in a hexagonal structure with space group P 3m1, as shown in Fig.…”