Abstract
The quasi-ternary systems Er2S3–In2S3–Ga2S3 was investigated by X-ray method, the isothermal section of the system at 770 K was constructed. Using X-ray structure analysis the crystal structures of the new compounds Ga2.78In3.88Y3.35S15 (I), Ga2.98In2.66Er4.37S15 (II), Ga3.37In1.26Tm5.37S15 (III), Ga3.46In1.58Yb4.96S15 (IV) were calculated. They crystallize in the space group C2/m with lattice parameters: a = 23.4104(6) Å, b = 3.81242(12) Å, c = 12.5460(4) Å, β = 90.775(3)° (I); a = 23.5181(17) Å, b = 3.8064(3) Å, c = 12.5592(9) Å, β = 90.954° (II); a = 23.5474(8) Å, b = 3.78634(15) Å, c = 12.5164(4) Å, β = 90.988(3)° (III), a = 23.4427(7) Å, b = 3.77641(8) Å, c = 12.4970(3) Å, β = 90.970° (IV). The photoluminescent spectra of the (Ga54.59In44.66Er0.75)2S300 single crystal were investigated. With the decreasing of the temperature till 300, 250, 200, 150 K the intensity of the photoluminescent spectra decreases. The position and shape of the spectra do not change according to the temperature decreasing. The maximum of the photoluminescent spectra (0.81 eV) corresponds to the transitions 4І13/2 → 4I15/2 in the f-shell of Er3+ ions.
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