Stage Project report:

Kinetics of oxygen diffusion in SLS-Fe, Mn glasses
From March 30th to June 19th 2009 Made by Jérémy Faliès from the IUT of Evreux

Project supervisor: Dr David Hollis

School of engineering and science University of the West of Scotland High Street, Paisley Scotland PA12BE
Authorization:

Kinetics of oxygen diffusion in SLS-Fe, Mn glasses

Abstract

The aim of this project was to obtain quantitative data for the couple Fe-Mn. This project involved a kinetic study of the approach of oxygen diffusion in Soda-Lima-Silica glasses which are coloured by iron and manganese. Analysis was performed from representative for several times of baking in the furnace before being cooled and annealed. The colour of the samples is very sensitive to the conditions in which the glass is made. The effect of time is studied in this project. Some studies have already been made for some colouring agents, but numerical data are lacking for many materials. From values obtained from an ultra violet- visible- infrared spectroscopy, a fitting program, which is based on Gaussian bands, and was originally developed at the University of Sheffield, was used to analyse the optical absorption spectra. Some adjustment to the Gaussian parameters was needed to give the best fit between the experimented spectrum and the synthetic, calculated spectrum. The next step was to find the relative ratios of ����3+,����2+ , ����3+, ����2+ from each optical absorption spectra, to obtain the evolution of each elements in the time, to reveal characteristics of oxygen diffusion in the time. The colour of the glasses changes with the time from a dark purple colour to a yellowish colour. With the redox equation and the colour, we have less ����3+, ����2+ , and more ����3+ , ����2+ in the time. The analysis from the fitting program and graphs permitted to observe a linear diffusion, with time and a near zero constant diffusion in the time up to ten hours. Keywords: Soda (����2��)