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Optical and electron paramagnetic resonance investigations of colour instabilities in amber glass as a function of melting temperature and batch redox conditions

1983; German Glass Technology Society (DDG); Volume: 24; Issue: 4 Linguagem: Inglês

0017-1050

M. M. Mestdagh, C. Dauby, L. Van Cangh, Céline Dupont,

Phase-change materials and chalcogenides

Soda-lime glasses containing different concentrations of iron, sulphate, and coke were melted with various thermal programmes. Optical and low temperature EPR measurements were made. The FeO/Fe/sub 2/O /sub 3/ and S/sup 2-//S/sup 6+/ ratios were correlated with the optical transmittance at 550 nm and the intensities of a set of EPR lines centred at g/sub eff/ sime 6. These new EPR lines are observed in iron-sulphur amber glass when the log sulphide to sulphate ratio exceeds -0.6: this value coincides with better fining conditions.