| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Glasses and Optical Materials: Current Issues and Functional Applications
|
| Presentation Title |
Effect of Modifier Cation Type on Structure and Nickel Speciation in Alkali Borosilicate Glasses |
| Author(s) |
Lucas L. Greiner, Brian Topper, Randall Youngman, Doris Möncke |
| On-Site Speaker (Planned) |
Lucas L. Greiner |
| Abstract Scope |
Undoped and Ni<sup>2+</sup> doped BK7 type borosilicate glasses (16 M2O – 10 B2O3 – 74 SiO2, M = Li, Na, K, Rb, and Cs) were melted and studied for variations in their structure and properties. Two mixed glasses with a 1:1 ratio of M = Li+Na and Cs+Rb were also added. Optical spectroscopy helped to explain the change in color due to a change in Ni-coordination from octahedral Ni<sup>2+</sup> (yellow) in Li-BS to tetrahedral Ni<sup>2+</sup> (brown) in Na-BS to likely blue Ni<sup>3+</sup> in glasses of higher optical basicity. Raman, infrared reflectance, and nuclear magnetic resonance (NMR) spectroscopies revealed a higher number of trigonal borate in the Li-glass, which showed turbidity likely connected to phase separation, and otherwise more four-fold coordinated tetrahedra. Raman spectroscopy saw a change in the connectivity from ore danburite (Na, K) to reedmergnerite-type superstructural units in glasses containing Rb and Cs. |