The solid solutions CuInSe2(1-x)Te2x, 0≦x≦1 have been prepared by melting stoichiometric mixtures of constituent elements. They have been characterised by conventional X-ray diffraction techniques and by Electron Probe Microanalysis. The compounds CuInSe2 and CuInTe2 are miscible in all proportions. The solid solutions solidify in the chalcopyrite structure throughout the composition range. The lattice parameters a and c vary parabolically with the composition variable x. © 1985.