Aluminum I 2100Synthesis of Sr 2 AlH 7 by Ball Milling Followed by Hydrogenation. -The title compound is synthesized by ball milling of Sr2Al (obtained by induction melting of Sr and Al metals) under hydrogen (150 rpm, 10 h) followed by hydrogenation or sintering (autoclave, 7 MPa H2, 533 K, 2 d). The yield of Sr2AlH7 in the hydrogenated product is 66 wt%, which is larger than that in the sintered product. If the Sr2Al alloy is milled at 300 rpm for 50 h or longer, the mass fraction of Al decreases strongly and the title compound cannot be obtained during subsequent hydrogenation. -(ZHANG, Q. A.; AKIBA*, E.; J. Alloys Compd. 394 (2005) 1-2, 308-311; Natl. Inst. Adv. Ind. Sci Technol., Tsukuba, Ibaraki 305, Japan; Eng.) -W. Pewestorf 29-025
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Reactions H 1000Reactions in the SrH2-Al-H2 System. -Sr2AlH7 is synthesized from a mixture of SrH 2 , Al, and H 2 at 553 K and a hydrogen pressure above 2.93 MPa. This reaction is reversible and can be considered for hydrogen storage applications. At a hydrogen pressure below 1.76 MPa, SrH2 reacts with Al to form SrAl4 and H2 in an irreversible reaction. Sr2AlH7 decomposes into SrH2, SrAl4, and H2 when the hydrogen pressure is below the equilibrium pressure of the irreversible reaction. -(ZHANG, Q. A.; AKIBA*, E.; J.
Hydrogen-Induced Phase Decomposition of Ba 7 Al 13 and the Crystal Structure of Ba 2 AlH 7 . -The title compound reacts with hydrogen (7 MPa) to form BaAlH 5 and Al between 373 and 553 K. In the temperature range 553-603 K, Ba7Al13 is hydrogenated to Ba2AlH7 and Al. Further increase of the temperature leads to the hydrogen-induced decomposition of the title compound into Ba2AlH7 and BaAl4. As revealed by neutron powder diffraction Ba 2 AlD 7 is isostructural to Sr 2 AlD 7 and crystallizes in the monoclinic space group I2/a. -(ZHANG, Q. A.; NAKAMURA, Y.; OIKAWA, K.; KAMIYAMA, T.; AKIBA*, E.; J.
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