FIGURE 2. Structure of stable high-pressure Li-Be compounds.

From the following article:

Emergent reduction of electronic state dimensionality in dense ordered Li-Be alloys

Ji Feng, Richard G. Hennig, N. W. Ashcroft & Roald Hoffmann

Nature 451, 445-448(24 January 2008)

doi:10.1038/nature06442

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Shown are Be-Li ordered alloys predicted to be stable. a, Stability range of the four stable LixBe1-x alloys. b, LiBe4 at 80 GPa (space group R-3m). c, LiBe2 at 83 GPa (P6/mmm). d, LiBe at 82 GPa (P21/m). e, Li3Be at 80 GPa (C2/m). Detailed structural information on these important phases is given in Supplementary Information.

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