Sodium copper silicate glasses of composition (SiO2) 0 70-x ( Na2O ) 0.30( CuO ) x where 0≤x≤0.20 were studied by magnetisation and x-ray photoelectron spectroscopy (XPS) techniques. The M versus H data at different temperatures collapses to a single curve in the M versus H/T representation for all the glass compositions studied, indicating that the magnetic ion-ion interaction is weak and that Cu2+ behaves paramagnetically in these glasses. The M versus H curves have been fitted with a Brillouin function by maintaining the number of magnetic ions as the fitting parameter and deducing the number of Cu2+ ions in each glass sample from the best fit to the experimental data. XPS has also been used to determine the number of Cu2+ ions in the glass samples by deconvoluting the Cu2p312 photoelectron spectra into contributions from Cu+ and Cu2+ ions. However, the number of Cu2+ ions detected by XPS is much lower than that obtained from bulk magnetic measurements. A possible origin of this difference is indicated.
|Number of pages
|Physics and Chemistry of Glasses
|Published - Feb 1998
ASJC Scopus subject areas
- Ceramics and Composites
- Physical and Theoretical Chemistry