GLASS FORMATION REGIONS IN THE SYSTEMS GA2S3 – LA(PR)2S3 – AIY (AI – CU, AG; Y – CL, BR, I) AND PROPERTIES OF OBTAINED GLASSES

Abstract

Based on the X-ray phase analysis results of samples of quasi-ternary systems Ga2S3 – La1.8Pr0.2S3 – CuI, Ga2S3 – La2S3 – AgBr, the boundaries of the glass-forming regions with a length of 2 mol.% CuI and 5 mol.% AgBr inside the concentration triangle were established. The maximum temperature of sample synthesis was 1370 K, followed by quenching of the ampoules in saturated aqueous sodium chloride solution with crushed ice. According to the DTA results, the temperature characteristics of the glasses of the Ga2S3 – La1.8Pr0.2S3 – CuI, Ga2S3 – La2S3 – AgCl (Br;I) systems were determined: glass transition, crystallization, melting and Hruby’s constant temperatures. The optical absorption spectra of glasses with the following compositions were studied: 66-х mol.% Ga2S3 – 30 mol.% La2S3 – 4 mol.% AgCl – х mol.% Er2S3, х = 0; 1; 3 mol.%; 67-х mol.% Ga2S3 – 30 mol.% La2S3 – 3 mol.% AgI – х mol.% Er2S3, х = 0; 0,75; 1,5 mol.%, in region 400–1050 nm. It was established that the glasses are transparent in the visible range and contain narrow absorption bands in Erbium-containing samples. In the AgCl containing samples the intensity of absorption maxima is higher than in samples with AgI, due to the fact that more Erbium ions move to the excited state.