The solid transition-metal cluster compounds M2B(M=Mo, W) and M2Ni(M=Zr, Hf) with Al2Cu structure type and MGe2(M=Nb, Ta) with CrSi2 structure type become superconductors under low temperatures. In this paper, the band structures of these compounds have been studied by using the tight-binding energy band method within the extended Huckel scheme. Their energy bands, densities of states and crystal orbital overlap populations are given. The relationship between the strength of chemical bonding and the superconducting transition temperatures are discussed.

Key words: CHEMICAL BONDS, BAND STRUCTURES, CHROMIC SILICIDE