Abstract
NbBe/sub 2/ has a face-centered cubic cell, a = 6.535 A; the space group is Fd3m; and there are eight formula units in the unit cell. Each niobium atom is surrounded by 12 Be atoms at 2.71 A and 4 Nb atoms ai 2.83 A. Each beryllium atom has 6 Nb atoms at 2.71 A and 6 Be atoms at 2.31 A as nearest neighbors. NbBe/sub 3/ has a rhombohedral cell with a = 7.495 A, alpha = 35.43%; the space group is R3-bar, and there are three formula units in the unit cell. There are two kinds of mobium atom NbI has 18 Be and 2 Nb nearest neighbors at average distances of 2.78 A and 2.95 A, respectively; NbII has 12 Be and 4 Nb nearest neighbors at average distances of 2.64 A and 2.88 A, respectively. (auth)
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