Chemical vapor transport of intermetallic systems. 9 - Chemical transport of copper germanides and copper silicides

By means of chemical vapor transport using iodine and bromine as transport agents in the system Cu/Ge the compounds Cu3Ge (epsilon and epsilon(1)), Cu 5Ge (zeta) and copper-rich mixed crystals Cu(Ge) have been prepared in form of single crystals. Thermodynamic considerations allow to understand the C VT process, especially the unexpected low temperatures. Copper silicides ca n be prepared under similiar conditions. They are extremely disordered. The ir crystallographic characterisation was therefore impossible.