Bulk Crystal Growth of Cr-doped MgAl2O4 spinel by Czochralski method and properties characterization

• Published in: Materials chemistry and physics 2018-01, Vol.204, p.277-281
• Main Authors: Sun, G.H., Zhang, Q.L., Luo, J.Q., Liu, W.P., Wang, X.F., Han, S., Zheng, L.L., Li, W.M., Sun, D.L.
• Format: Article
• Language: English
• Subjects: Characterization; Czochralski method; Luminescence; Single crystal growth
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2017.10.049

Cr3+-doped MgAl2O4 single crystal with size of Ø30 mm × 70 mm, was firstly successfully grown by the Czochralski method and the effective segregation coefficient of Cr3+ was determined. The X-ray powder pattern was studied, and the X-ray rocking curve indicates a high crystalline quality of the grown crystal. The thermal conductivity was measured from 270 K to 370 K, and the optical absorption measurements in the 250–1000 nm spectral regions was performed at room temperature. Furthermore, emission spectra, excitation spectra and fluorescence decay curve of Cr:MgAl2O4 crystal were also recorded. •Bulk Cr:MgAl2O4 single crystal was successfully grown by the Czochralski method.•The grown crystal indicates a high crystalline quality with the size of Ø30 mm × 70  mm.•At 300 K and 370 K, the thermal conductivity is 22.16 W/mK and 20 W/mK respectively.•The crystal has broad absorption bands with the peaks at 393 nm and 545 nm.•The most intense emission peak is located at 688 nm and the decay time is 4 ms.