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(A) Enthalpies of the bcc, sc, and I41/amd (β-tin phase) structures (relative to fcc). (B) Enthalpies of several competitive phases (relative to the β-tin phase). A few other structures [C2/c-32 (host–guest), C2/c-24, I4/mcm-32 (host–guest)], very nearly degenerate with the ground states, are not shown for clarity.
