چكيده به لاتين
Over the past few decades, glass-ceramics containing semiconductor oxide nanocrystals have attracted a lot of attention due to their special optical properties. Among these semiconductor materials, it is possible to synthesis glass-ceramics with more crystalline phase by using Indium oxide due to its higher dissolution in silicate glasses. For example, If Sn4+ doped in the structure of Indium oxide the n-type semiconductor called ITO, with bandgap energy about 4 eV, would be formed. Thin films of Tin-doped Indium oxide (ITO) exhibit high electrical conductivity and transparency in the visible range, and high infrared reflectivity for wavelengths higher than 1μm. The crystallization of ITO in Aluminosilicate and Aluminoborosilicate glasses to investigate their optical properties is the goal of this study. It should be mentioned that there is no earlier report on crystallization of ITO in glasses which is the original novelty of this study. In the present study, samples were prepared in SiO2-Al2O3-Na2O-CaO and SiO2-Al2O3-B2O3- Na2O systems containing In2O3 and SnO2. The glasses were synthesized by melting in a platinum crucible at 1600℃. The glass-ceramics containing ITO Crystallites were obtained by heat treatment process at temperature range 650-800℃ for 10 hours. The main crystallization mechanism, which leads to decrease in the kinetic and the thermodynamic barriers of crystallization, was the phase separation by adding the B2O3. The best optimum microstructural and optical properties achieved from B3/650 sample. The visible transmission higher than 60% along with very strong reflection or absorption in Near IR range (>98%) was achieved from this sample. The crystallite size and the crystalline phase percent of this sample were about 13 nm and 37%, respectively. There was a wide absorption bands at wavenumbers 400- 1500 cm-1 according to the presence of [SiO2], [BO4], [BO3] bendings, and In-O bonds which were concluded from FTIR analysis.
