An XPS and physical property study of sodium praseodymium silicate glass structure

A. Mekki, K. A. Ziq, D. Holland*, C. F. McConville

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

X-ray photoelectron spectroscopy (XPS) has been used to study surfaces, produced by fracture in-vacuo, of praseodymium sodium silicate glasses of nominal composition xPr2O3.0·3 Na2O. (0·7-x)SiO2 (0·0≤x≤0·075). The Pr 3d spectra show intense satellite structure 4·1 eV below the main photoelectron peak with an integrated intensity ratio (satellite:main) of ∼0.35 in all the glasses. These observations indicate the presence of only trivalent Pr in these glasses. The O 1s core level spectra show significant composition dependent changes. Two distinct peaks are resolvable arising from the bridging oxygen (BO) and nonbridging oxygen atoms (NBO) in both the binary and ternary silicate glasses. The fraction of nonbridging oxygen was determined from these spectra and found to increase with increasing praseodymium oxide content in the glass. The NBO contribution to the total O 1s spectrum for each glass sample has been simulated with contributions from the separate configurations SiOPr(III) and SiONa. The physical and thermal properties of these same glass samples indicate that Pr2O3 enters the glass network as an intermediate rather than a modifier oxide. The magnetic susceptibility (χ) measurements indicate that χ-1 follows a Curie-Weiss law behaviour and the negative Curie temperature (θp) indicates an antiferromagnetic exchange interaction for all glass samples in this composition range.

Original languageEnglish
Pages (from-to)41-46
Number of pages6
JournalPhysics and Chemistry of Glasses
Volume43
Issue number1
StatePublished - Feb 2002
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Physical and Theoretical Chemistry

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