| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Solid-state Optical Materials and Luminescence Properties
|
| Presentation Title |
Mgx-1ZnxAl2O4 Solid State Solutions: Microstructure and Luminescence |
| Author(s) |
Luiz G. Jacobsohn, Robin L. Conner |
| On-Site Speaker (Planned) |
Luiz G. Jacobsohn |
| Abstract Scope |
MgAl2O4 and other spinels stand out as wide band gap optical materials that can accommodate numerous activators and present intriguing luminescence properties. A systematic investigation of the microstructure and luminescence properties of (Mgx-1Znx)Al2O4 solid state solutions with 0 ≤ x ≤ 1 was carried out. Materials were prepared by co-precipitation and calcination, their microstructure characterized by XRD, SEM and ATR FTIR, and luminescence by radioluminescence (RL) under X-ray excitation and thermoluminescence (TL). A continuous non-linear decrease of the lattice parameter and a progressive shift of the infrared absorption peaks were observed for higher Zn contents confirming the formation of solid state solutions. In addition to the emission from Cr and Mn impurities, an intense broad band at 400 nm was observed. The nature of this band is discussed under the light of the formation of anti-site defects. Acknowledgement to NSF DMR-1653016 and NASA SC Space Grant REAP 521383-RP-CM-013. |