THE BA ANALOG OF SR2MG3H10

Ba2Mg3H10 and its deuteride were synthesized from BaMg1.7 alloy and characterized by X-ray and neutron powder diffraction. They crystallize with the monoclinic Ba2Ni3F10 structure type in space group C2/m (a = 18.014(2) Angstrom, b = 5.876(1). Angstrom, c = 7.879(1) Angstrom, beta = 111.93(1)degrees, V = 773.7(1) Angstrom(3) (hydride); a = 17.950(7) Angstrom, b = 5.856(2) Angstrom, c = 7.869(3) Angstrom, beta = 111.88(3)Angstrom, V = 767.6(5) Angstrom(3) (deuteride) and are essentially isostructural to the recently reported fake Sr2Mg3H10, with slight differences in the coordination of the Ba atoms. The metal-deuterium bond distances range from 2.55 Angstrom to 3.20 Angstrom (Ba-D) and from 1.90 Angstrom to 2.18 Angstrom (Mg-D). The shortest D-D distance is 2.57 Angstrom.