X-RAY GRAPHIC STUDY OF STRUCTURAL TRANSFORMATIONS IN CRYSTALS OF Cu_(2-x) Ni_(0.05) S (x=0.05,0.25,0.30)

Abstract

The article is devoted to the physico-chemical and structural phenomena that occur under the influence of the partial replacement of Cu atoms with Ni atoms in Cu2S crystals on the mechanism and nature of the phase transition. For this purpose, X-ray phase analysis of single crystals Cu_(2-x) Ni_0.05 S (x=0.05,0,25,0,30) was performed, which were synthesized and grown in the laboratory for the first time. A diffractogram of the crystal Cu_1.70 Ni_0.05 C, Cu_1.75 Ni_0.05 C, Cu_1.95 Ni_0.05 C was prepared at a room temperature. The results were analyzed. Thus, it was found that, unlike non-stoichiometric Cu_(2-x)S compounds having two and three phases at room temperature, the obtained crystals Cu_1.70 Ni_0.05s, Cu_1.75 Ni_0.05s and Cu_1.95 Ni_0.05s are single-phase. The reliability of the experimental results were confirmed by the theoretical calculations using the example of the fragment taken from the diffractogram of the Cu1.95Ni0.05S crystal (radiation: CuKa (λα=1.5418 A0), filter-Ni, mode: 35 kV, 10 mA).