The influence of the Cu-content in the quaternary compounds Cu_xAg_1-xInTe₂(0 <= x <= 1) on the structural properties of the bulk material was discussed. Bulk ingot materials of Cu_xAg_1-xInTe₂ solid solutions (x = 0.0, 0.25, 0.50, 0.75 and 1.0) have been synthesized by fusion of the constituent elements in the stoichiometric ratios in vacuum-sealed silica tubes. The materials compositions were confirmed by using energy dispersive analysis of X-rays (EDAX). X-ray powder diffraction measurements were performed for all the prepared samples at 300 K in step scanning mode. The analysis of X-ray data has indicated that the crystal structure of the prepared materials with different compositions is single-phase polycrystalline materials corresponding to the tetragonal chalcopyrite structure with space group I-42d. The crystal structural parameters were refined by Rietveld method using the Full Prof program. The refined lattice constants (a and c), anion positional parameter, u, and the determined bond distances and angles were found to vary with composition, x, attaining zero tetragonal distortion at x ~ 0.75, which corresponds to an ideal tetragonal unit cell.

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