Materials Data on La(MgSi)2 by Materials Project
La(MgSi)2 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Mg is bonded in a distorted square co-planar geometry to four equivalent Si atoms. All Mg–Si bond lengths are 2.78 Å. La is bonded to eight equivalent Si atoms to form a mixture of distorted face and edge-sharing LaSi8 hexagonal bipyramids. All La–Si bond lengths are 3.26 Å. Si is bonded in a 9-coordinate geometry to four equivalent Mg, four equivalent La, and one Si atom. The Si–Si bond length is 2.31 Å.
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