Structural, Spectroscopic, and Magnetic Characterization of Cobalt(III) Oxide–Disodium Tetraborate Glasses

ABSTRACT

Co₂O₃–Na₂B₄O₇ glasses were prepared by melt-quenching and characterized by X-ray diffraction, density measurements, infrared spectroscopy, diffuse reflectance ultraviolet–visible spectroscopy, and magnetic measurements. Results show that addition and successive increase of cobalt oxide determines important properties of the glasses. An increase in cobalt oxide concentration converted BO₄ structural units into BO₃ units and led to intensification of magnetic interactions between cobalt ions. The presence of cobalt(III) in glasses was confirmed by optical spectroscopy and magnetic data.

KEYWORDS:

• Diffuse reflectance ultraviolet–visible spectroscopy
• infrared
• magnetic properties
• oxide glasses
• X-ray diffraction