The Science & Technology
of Glass
Cambridge - Monday 4th to
Wednesday 6th September 2017

Natan Capobianco

article posted 07 August 2017

2014 - Graduation (Chemistry) at Ecole Normale Supérieure, Paris and graduated in Materials Chemistry, University P&M Curie, Paris

2015-present. PhD Student at Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Paris

EPR and optical absorption spectroscopic study of Cu2+ in alkali borate glasses
Natan Capobianco*, Gérald Lelong, Laurence Galoisy and Georges Calas
Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Sorbonne Universités, Université P&M Curie and CNRS, Paris, France

Copper (II) oxide (CuO) is a commonly used colorant in glasses, providing a wide range of coloration from blue-turquoise to red and colourless, depending on the synthesis conditions. Cu2+ is also a well-known probe of glass structure. We synthesized alkali borate glasses at 1000°C in platinum crucible with various concentration (10 %, 20 %, 30 %) of alkali oxide (Li2O, Na2O, K2O) containing 0.2 mole% CuO and melted in open atmosphere.

We have combined a spectrometric and colorimetric study to follow the chemical dependence of the colour of the glasses, following the position, line-width and asymmetry of the Cu2+ absorption band. EPR spectra have been investigated at ambient and low temperature, in X and Q band, on glasses containing natural Cu or enriched in 63Cu, in order to get through modelling and simulation new information on g distribution and hyperfine coupling parameters of paramagnetic Cu2+. This allows interpret these changes in term of structure of borate glasses at the light of recent structural data.