Isothermal sections of the quasi-ternary systems Ag2S(Se)-Ga2S(Se)(3)-In2S(Se)(3) at 820 K and the physical properties of the ternary phases Ga5.5In4.5S15, Ga6In4Se15 and Ga5.5In4.5S15:Er3+, Ga6In4Se15:Er3+

摘要

Isothermal sections of the quasi-ternary systems Ag2S(Se)-Ga2S(Se)(3)-In2S(Se)(3) at 820 K were compared. Along the 50 mol% Ag2S(Se), both systems feature continuous solid solutions with the chalcopyrite structure. Along the 17 mol% Ag2S(Se), the interactions at the AgIn5S(Se)(8)-"AgGa5S(Se)(8)" sections are different. In the Ag2S-Ga2S3-In2S3 system the existence of the layered phase AgGa5In5-xS8, 2.25 <= x <= 2.85, was confirmed (S.G. P6(3)mc). The Ag2Se-Ga2Se3-In2Se3 system features the formation of solid solution (up to 53 mol% Ga2Se3) based on AgIn5Se8 (S.G. P-42m). Crystal structure, atomic co-ordinates were determined by powder diffraction method for samples from the homogeneity region of AgIn5Se8. Specific conductivities of the crystals Ga6In4Se15 (1.33.10(-6) Omega(-1)m(-1)), Ga5.94In3.96Er0.1Se15 (3.17.10(-6)Omega(-1)m(-1)), Ga5.5In4.5S15 (7.94.10(-6)Omega(-1)m(-1)), Ga5.46In4.47Er0.07S15 (1.10(-9)Omega(-1)m(-1)) were measured at room temperature. Optical absorption and photoconductivity spectra were recorded in the range 400-760 nm. The introduction of erbium leads to an increase in the absorption coefficient and to the appearance of absorption bands at 530, 660, 810, 980, 1530 nm. (C) 2016 Elsevier Inc. All rights reserved.