The intermetallic compound Mg2Ni is milled under hydrogen in a high-en
ergy planetary mill. The resulting material is a mixture of heavily de
formed Mg2Ni, low-temperature Mg2NiH4, and, possibly, high-temperature
Mg2NiH4 structures. The relative amount of each phase depends on the
initial hydrogen pressure in the milling vial. (C) 1998 Elsevier Scien
ce S.A.