Thermal expansion and structural properties of (CuAlTe₂)_1–x(CuAlSe₂)_x solid solutions

Abstract

Investigations of the thermal expansion of (CuAlTe 2 ) 1-x (CuAlSe 2 ) x solid solutions in the temperature range from 100 to 800 K have been carried out for the first time. It has been demonstrated that the thermal expansion coefficient α L grows considerably in the temperature range from 100 to 300 K, whereas the temperature dependence above 300 K is rather weak. The isotherms of composition dependence of the thermal expansion coefficient α L for 100, 293, 500 and 800 К were constructed, and it was found that linear relations could express them. The Debye temperatures θ D , the average mean-square dynamic displacements ū 2 , the average root-mean-square amplitudes of thermal vibration RMS, the anion position parameter u using S. C. Abrahams & J. L. Bernstein (u AB ) and J. E. Jaffe & A. Zunger (u JZ ) models were calculated. The composition dependence of microhardness H using the phenomenological theory was also calculated, and it was discovered that this dependence has a non-linear character with a maximum of 383 kg/mm 2 at x=0.67.

Microstructure of CuFeS2–δ–CuInS2 alloys

“…It was found that the range of solid solution in the terminal chalcopyrite compounds at 473 K is limited to 0<z<≈0.20 for CuInS 2 α-phase and ≈0.94<z<1.0 for CuFeS 2 γ-phase. It is necessary to take into account that it is a serious problem to determine solubility in the systems formed by the two corresponding ternary compounds of these groups [17].…”

Thickness Effect of CuAlTe2 Thin Films on Morphological, Structural and Visual Properties

“…They crystallize in these chalcopyrite structure that closely for zinc blend. Completely these materials have direct band gaps [1]. Ternary ceramic is attractive materials in promising photovoltaic and optoelectronic requests [2,3].…”

Phase relations in the CuInSe2–CuBiSe2 semiconductor system

“…Their magnetic properties for Mn-substitution were also studied [7]. It is necessary to take into account that in the study of pseudobinary systems formed by two ternary compounds of this group, the determination of the defect chemistry and solubility is a serious problem [8].…”

“…CuBiSe 2 is reported to crystallize in the cubic lattice of fcc-type with lattice constant a = 5.69 Å and a melting point of 858 K [10]. On the other hand, the crystal system of Cu 4 Bi 4 Se 9 was determined as orthorhombic with space group Pnma and lattice constants a = 32.692(7), b = 4.1198 (8), and c = 12.202(2) Å [11]. Phase relations, that were determined in the Cu-Bi-Se phase system at 573, 623, 673, 723, 823, 923, and 1023 K, revealed the existence of four ternary phase Cu 4 Bi 4 Se 9 (phase A), Cu 1,7 Bi 4,7 Se 8 , Cu 3 Bi 5 Se 9 , and Cu 3 Bi 2 Se 6 [11].…”