Zn2-2xCuxInxSe2 crystals were synthesized by the directional freezing method using elementary components as starting materials. The crystals were also used as target materials. Thin films of Zn2-2xCuxInxSe2 were prepared for the first time by pulsed laser deposition using a Nd:YAG laser and glass substrates at temperatures in the range 470 – 490 °C. The growth conditions of these samples and their composition, structural, electrical and optical properties have been studied. Especially the copper rich Zn2-2xCuxInxSe2 materials were investigated.
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 X-ray method was used to determine the linear thermal expansion coefficient of SrF, in the temperature range from 301 to 1173 K. A comparison of the thermal expansion coefficients of CaF,, SrF, and BaF, a t T > 300 K shows that the degree of lattice anharmonicity in the alkaline earth fluorides decreases with increasing mass of the alkaline earth atom. The results for the thermal expansion of SrF, are used to discuss the temperature dependence of the lattice mismatch in the SrFJInP film-substrate system.
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