Alloys in the CuAlSe 2 -CuAlTe 2 system were synthesized in BN-crucibles in silica tubes under vacuum to obtain the corresponding phase equilibria. X-ray powder diffraction and thermal analytic data of the T -x phase diagram revealed a complete solid solutions series in the subsolidus region. Within the CuAlSe 2x Te 2(1-x) system the refined lattice parameters a and c approximately obey the Vegard rule and also the cell volume and the heat of fusion confirm linear correlations with the composition of the mixed crystals. The anion position parameter calculated after S. C. Abrahams & J. L. Bernstein (u AB ) and J. E Jaffe & A. Zunger (u JZ ) is greater than 0.25 and reveals a linear dependence on composition. The liquidus part of the CuAlSe 2x Te 2(1-x) system with x < 0.35 exhibits vertical section behaviour with a ternary peritectic followed up by a ternary monotectic whereas the region with x > 0.35 shows quasibinary equilibria.

The starting ternary compounds CuInS 2 and CuSbS 2 and alloys of the CuSbS 2 -CuInS 2 system with the molar fractions of CuInS 2 (x) equal to 0. 05, 0.15, 0.25, 0.375, 0.50, 0.625, 0.75, 0.85, and 0.95 were prepared and the phase relations in this system were investigated by X-ray powder diffraction, optical microscopy, scanning electron microscopy, and differential thermal analysis. It was shown that the T-x phase diagram of the CuInS 2 -CuSbS 2 system has a eutectic character with the eutectic temperature of 807 K. The alloys of the CuSbS 2 -CuInS 2 system with the molar fraction of CuInS 2 in the range from 0.038 to 0.941 at room temperature are two-phased, and the limits of solubility are 0.059 molar fractions for CuSbS 2 in CuInS 2 and 0.038 molar fractions for CuInS 2 in CuSbS 2 .

Alloys of the (CuBiSe2)1–x(CuInSe2)x system with molar part of CuInSe2 (x) equal to 0.05, 0.15, 0.25, 0.375, 0.50, 0.625, 0.75, 0.85, and 0.95 were prepared and the phase relations in this system above 600 K were investigated by using of X‐ray powder diffraction, microstructure studies, and differential thermal analysis. It was established, that the T–x phase diagram of the CuInSe2–CuBiSe2 system has a peritectic character with the peritectics temperature of 837 K. The limits of solubility from both sides of the system do not exceed 0.05 molar parts of the corresponding ternary compound. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

No 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.