Склоутворення в квазіпотрійних системах AІ 2S-ВIVS2-P2S5 (АI - Cu, Ag; ВIV - Ge, Sn)

Abstract

The boundaries of the glass formation areas of quasiternary systems AІ 2S–ВIVS2–P2S5 (АI – Cu, Ag; ВIV – Ge, Sn) have been established by the method of X-ray phase analysis. The compound GеS2 can exist in a glass state, so that germanium disulphide acts as a glass former in quasi-triple systems.The glass semiconductor alloys have been synthesized by the single-temperature method from the elementary substances of copper (99.99 wt.%), silver (99.99 wt.%), germanium (99.9999 wt.%), tin (99.999 wt.%), red phosphorus (99.998 wt.%) and sulfur (purity 99.997 wt.%). Maximum synthesis temperature was 1173 K, followed by quenching of the ampoules in a saturated solution of sodium chloride with crushed ice. Glasses with a high content of phosphorus are easily hydrolyzed under the influence of moisture of the air. Diffractograms have been recorded on a diffractometer DRON 4-13, CuKα-radiation, range of angles 2θ=10÷50°, stepped scan 0,05º, exposure time 2 seconds. Amorphousness of the obtained alloys has been controlled visually by the fracture characteristic of the glass and with the help of X-ray diffraction studies. «Gallo» has been observed on all diffractograms of glass samples, presence of which indicates the absence of long-range order in the alloy structure. There are continuous bands of glass formation on the sides GeS2–P2S5 in the studied germanium-containing systems АI 2S–GеS2–P2S5. The obtained glasses have been transparent, yellowred color with the fracture characteristic of the glass. The main factor is the tendency of GeS2 and P2S5 to the glass formation. There has been found that all samples have polycrystalline nature in the system Cu2S–GеS2. Only GeS2 and Ag2GeS3 have been obtained in the vitreous state from the cross section Ag2S–GeS2.The maximum content of Cu2S and Ag2S, which are a part of the glass in systems Сu(Ag)2S–GеS2–P2S5, is 10 and 70 mol.% accordingly. The areas of glass formation have been much smaller compared to similar germaniumcontaining in the state-containing systems of the glassformation area, which is associated with the strengthening of the metal component of the chemical bond by changing GeS2 to SnS2. We observe only two areas of glass formation in quasi-triple systems Сu(Ag)2S–SnS2–P2S5 which are on the side SnS2–P2S5: one in the area 5–15 mol.% P2S5, including approximately 5 mol.% Cu2S та Ag2S, the other – 35–65 mol.% P2S5, the maximum content of Cu2S and Ag2S is 13 and 4 mol.%.