About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Glasses and Optical Materials: Current Issues and Functional Applications
|
Presentation Title |
D-19: Unusual High Oxidation States of Transition Metal Ions in Silicate Glasses of High Optical Basicity: Trivalent Co<sup>3+</sup> and Ni<sup>3+</sup> |
Author(s) |
Lucas L. Greiner, Jacob Kaspryk, Randall Youngman, Alix Clare, Doris Möncke |
On-Site Speaker (Planned) |
Lucas L. Greiner |
Abstract Scope |
Atypical high oxidation states of transition metal ions have been successfully stabilized in the Cs2O-BaO-SiO2 metasilicate glass system of extremely high optical basicity (Λ=0.73-0.85). These glasses were prepared via traditional melt-quenching and analyzed directly after preparation. Previous solarization experiments in silicates and borosilicate glasses where Co<sup>2+</sup> and Ni<sup>2+</sup> are tetrahedrally coordinated showed that Co<sup>3+</sup> (d6) and Ni<sup>3+</sup> (d7+) can form by photo-oxidation under high energy irradiation by UV light or X-rays. The spectral parameter of trivalent Co and Ni ions in glasses were determined by UV-Vis and electron paramagnetic resonance (EPR) spectroscopy and compared with reference materials. Overlapping of optical bands of divalent and trivalent ions, of octahedral and tetrahedral coordination complicates the analysis. |