Phase diagram of the CdGa₂Se₄–Sb₂Se₃ system and single crystal growth of CdGa₂Se₄

Chem. Met. Alloys 2 (2009) 55-58

https://doi.org/10.30970/cma2.0090

S.M. Sosovska, O.M. Yurchenko, Y.E. Romanyuk, I.D. Olekseyuk,

O.V. Parasyuk

The phase diagram of the CdGa₂Se₄–Sb₂Se₃ system was investigated by differential-thermal analysis, powder X-ray diffraction, and metallography. The system is of the eutectic type with coordinates of the eutectic point ~88 mol.% Sb₂Se₃ and 835 K. From the constructed phase diagram, an optimum concentration of the Sb₂Se₃ solvent was selected, and single crystals of CdGa₂Se₄ were grown by the solution-melt method. Absorption spectra of the grown crystals were studied. The estimated optical band gap is 1.95±0.05 eV. A weak absorption band at 1.5-1.7 eV is attributed to the antimony impurity.

Phase diagram of the CdGa₂Se₄–Sb₂Se₃ system: (1) L; (2) L+a; (3) a; (4) a+a'; (5) a'; (6) L+a'; (7) L+Sb₂Se₃; (8) a'+Sb₂Se₃.

Keywords

Inorganic Materials / Crystal Growth / X-ray diffraction / Phase diagram / Thermal analysis