Study properties of Cr2O3 doped in glasses prepared from sugar cane ash

Abstract

The physical and optical properties of glass samples which manufactured using sugar cane ash were investigated. The chemical composition of the sugar cane ash was first analyzed using an X-Ray fluorescence Spectrometer (XRF). The sugar cane ash samples were sintered at dierent temperatures (400 ^oC, 600 ^oC, 800 ^oC and 1000 ^oC) under the same background conditions. Samples were produced with increasing concentrations of Cr₂O₃. It was found that the density and refractive index of the glass samples was found to increase as a result of increasing the concentration of Cr₂O₃ in the sample. The absorption spectra of the samples was measured using a UV-visible light spectrometer. The absorption peak was found to be at 640 nm. This was thought to be due to the transition ⁴A_2g (F) ⁴T_2g (F). This was in turn thought to be due to the Cr³⁺ ion in octahedral coordination with strong tetragonal distortion. There was another absorption band that was observed at approximately 460 nm. This was thought to be due to the split components of the ⁶A_1g(S) ⁴T_2g (G) transition. Iron, in the Fe²⁺ state, exists in the glass in equilibrium with the yellow ferric ion (Fe³⁺). The color coordinate in the glass samples were measured and showed good agreement with the absorption spectra that was observed