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LaC2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. La2+ is bonded in a distorted q4 geometry to ten equivalent C1- atoms. There are two shorter (2.64 Å) and eight longer (2.86 Å) La–C bond lengths. C1- is bonded in a 6-coordinate geometry to five equivalent La2+ and one C1- atom. The C–C bond length is 1.30 Å.
Mass spectroscopy of vaporization of lanthanum and scandium carbides
Vaporization thermodynamics of lanthanum carbides from Knudsen effusion mass spectrometry
LaC2(BiO)2 crystallizes in the tetragonal I4/mmm space group. The structure is two-dimensional and consists of two BiO sheets oriented in the (0, 0, 1) direction and two LaC2 sheets oriented in the (0, 0, 1) direction. In each BiO sheet, Bi3+ is bonded in a 4-coordinate geometry to four equivalent O2- atoms. All Bi–O bond lengths are 2.34 Å. O2- is bonded to four equivalent Bi3+ atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In each LaC2 sheet, La3+ is bonded to eight equivalent C+2.50- atoms to form a mixture of edge and face-sharing LaC8 hexagonal bipyramids. All La–C bond lengths are 2.83 Å. C+2.50- is bonded in a 5-coordinate geometry to four equivalent La3+ and one C+2.50- atom. The C–C bond length is 1.32 Å.