Synthesis, characterization and luminescent properties of Mg- and Cr-doped alumina ceramics

• Main Authors: Frolov, E. I., Zvonarev, S. V., Moschensky, Yu. V., Chesnokov, K. Yu, Chukin, A. V., Abramov, A. V., Churkin, V. Yu, Moiseykin, E. V., Obvintseva, N. V.
• Format: Conference Proceeding
• Language: English
• Subjects: Aluminum oxide; Annealing; Cathodoluminescence; Ceramics; Chromium; Differential thermal analysis; Dopants; Electron beams; High temperature; Luminescence; Magnesium; Optical properties; Thermoluminescence; X ray fluorescence analysis
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0018319

Alumina ceramic doped with Mg and Cr is produced at high-temperature sintering under vacuum at varying annealing temperature and dopant concentration. A differential thermal analysis, X-ray fluorescence, and X-ray diffraction methods are used for sample characterization. The effect of the characteristics described above on the formation of different defects and luminescence centers in the samples was studied with a thermoluminescence method. An increase in the dopant concentration leads to an increase in the pulsed cathodoluminescence intensity of the dopant center in Mg-doped alumina ceramics and a decrease in Cr-doped alumina ceramics. The thermoluminescence intensity for Al2O3:Mg ceramics increases with magnesium concentration growth. The highest thermoluminescence intensity under a pulsed electron beam was obtained for ceramics with chromium (0.1 wt. %) annealed under vacuum at the temperature of 1500 °C for 2 hours. On thermoluminescence curves, one isolated peak at a temperature in the range of 645–665 K was registered.