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Crystal structures of (a) (Ref. 33) and (b) (Ref. 34). Darker spheres are Sn atoms and the lighter spheres are the metallic atoms.
Experimental data on and .
Calculated lattice constants of and .
Calculated elastic constants (GPa) of (, points) and (, points).
Bounds on the polycrystalline moduli calculated from GGA elastic constants.
Bounds on the polycrystalline moduli calculated from LDA elastic constants.
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