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Li2AgGe crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Li2AgGe ribbons oriented in the (1, 0, 0) direction. Li is bonded in a linear geometry to one Ag and one Ge atom. The Li–Ag bond length is 2.58 Å. The Li–Ge bond length is 2.62 Å. Ag is bonded in a linear geometry to two equivalent Li atoms. Ge is bonded in a linear geometry to two equivalent Li atoms.
Li2AgGe is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Li is bonded in a body-centered cubic geometry to four equivalent Ag and four equivalent Ge atoms. All Li–Ag bond lengths are 2.71 Å. All Li–Ge bond lengths are 2.71 Å. Ag is bonded in a body-centered cubic geometry to eight equivalent Li atoms. Ge is bonded in a body-centered cubic geometry to eight equivalent Li atoms.