Hydrogen-induced phase decomposition of Ba7Al13 and the crystal structure of Ba2AlH7

Q. A. Zhang, Y. Nakamura, K. Oikawa, T. Kamiyama, E. Akiba

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21 Citations (Scopus)

Abstract

The hydrogenation characteristics of Ba7Al13 have been studied under a hydrogen pressure of 7 MPa at different temperatures for 5 days. Ba7Al13 reacts with hydrogen to form BaAlH 5 and Al between 373 and 553 K. When the temperature is in the range from 553 to 603 K, Ba7Al13 is hydrogenated to Ba 2AlH7 and Al. However, further increasing the temperature leads to the hydrogen-induced decomposition of Ba7Al13 into Ba2AlH7 and BaAl4. The crystal structure of Ba2AlD7 was also studied by neutron powder diffraction. Ba2AlD7 is isostructural to Sr2AlD 7, crystallizing with a monoclinic structure in space group I2/a. The lattice parameters were determined as a=13.197(3) Å, b=10.237(2) Å, c=8.509(2) Å, β=101.290(9)°.

Original languageEnglish
Pages (from-to)180-186
Number of pages7
JournalJournal of Alloys and Compounds
Volume361
Issue number1-2
DOIs
Publication statusPublished - Oct 27 2003

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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