The triclinic high temperature modification of the α phase of the Zn–Al system

The structure of the {beta} phase of the Zn-Al system was reinvestigated. The X-ray diffraction (XRD) pattern of the Zn-21.0wt%Al after 9 h at 350 C clearly showed the splitting of some Bragg peaks. The triclinic structure permits a description of the spectra with a = 285.857, b = 285.283, c = 285.847 pm, {alpha} = 59.602{degree}, {beta} = 59.869{degree}, {gamma} = 59,716{degree}. This structure corresponds to a small distortion of the primitive R cell of the high temperature fcc solid solution {alpha}-(Al) when the Zn content reaches about 69.5 wt% at 350 C.