Materials Data on Np(CuSi)2 by Materials Project
NpCu2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Np6+ is bonded in a distorted body-centered cubic geometry to eight equivalent Si4- atoms. All Np–Si bond lengths are 3.03 Å. Cu1+ is bonded to four equivalent Si4- atoms to form a mixture of corner and edge-sharing CuSi4 tetrahedra. All Cu–Si bond lengths are 2.38 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Np6+, four equivalent Cu1+, and one Si4- atom. The Si–Si bond length is 2.35 Å.
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