ESTUDIO ESTRUCTURAL Y DIAGRAMA DE FASES DEL SISTEMA DE ALEACIONES Cu2Zn1-zMnzSnSe4

Abstract

The structural study and phase diagram of the alloy system Cu2Zn1-zMnzSnSe4 are reported. Polycrystalline samples were synthesized using the direct fusion and annealing technique from the constituent elements. X-ray diffraction analysis indicates that system crystallizes in the tetragonal stannite structure with a possible I4 2m space group. From differential thermic analysis (DTA) experiment the phase diagram was constructed for alloy system, which suggests that the region between 600 and 700 °C is biphasic coexisting stannite and wurtz-stannite phases (+). The peritectic decomposition of the system   (L+ZnSe) in the region between z = 0 and z  0.80 occurs at  800 oC, for z > 0.80 the peritectic temperature decreases to 700 oC with z = 1.0. The transition of liquid L to (L+ZnSe) is given by the boundary line between 1075 oC with z = 0 and 770 oC with z  0.80. The region of the diagram below 600 oC corresponds to the appearance of the tetragonal stannite phase, as it indicated by the X-ray diffraction study at room temperature.