Sodium praseodymium silicate glasses of nominal composition 0.3Na2O xPr2O3 (0.7-x)SiO2, where 0 ≤ x ≤ 0.10, have been studied by magnetisation and X-ray photoelectron spectroscopy (XPS). The magnetisation data fail to collapse to a single curve in the M versus H/T representation for all values of x and the spread increases with x, indicating an increase in the magnetic exchange interaction. The M versus H data acquired at different temperatures have been fitted with a Brillouin function by refining the number of Pr3+ ions in each glass sample. It was found that most of the Pr ions are in Pr3+ valence state and only a small fraction (≤ 5%) in the Pr4+ state. Analysis of the XPS line shape indicates only the presence of Pr3+ ions in these glasses.
Bibliographical noteFunding Information:
Two of the authors (A.M. and K.A.Z.) would like to acknowledge the support of King Fahd University of Petroleum and Minerals.
- X-ray photoelectron spectroscopy
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics