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Fe 2 B- and Mn 4 B-type compounds are described for the first time in terms of structural frameworks of close-packed M 4  tetrahedra with ten nearest neighbors. The physical significance of the metal tetrahedra is discussed. Assignment of a quasi-spherical radius to the M 4  units enables a fairly accurate calculation of unit-cell dimensions. Various packing models leading to a coordination of ten are examined.

Tetrahedral metal groups in Fe 2 B and Mn 4 B structures