Abstract
We have reported the crystal structure of the superconducting systems Y2C3 and Li2Pd3B without inversion symmetry. The structure of Y2C3 has the dumbbell-like C-C unit occupying polyhedrally-coordinated void, while the structure of Li2Pd3B has three-dimensional framework of the BPd6 octahedron, which exists at the clearance gap of the Li partial structure. The superconducting transition temperature is strongly dependent on the structural change of the C-C distance in the Y2C3 system and of the distortion of the BPd6 octahedron in the Li2Pd3B system.
