Abstract
Cr3+ doped MgAl2O4 nano powders were prepared by the Pechini-type sol–gel process. Comprehensive analysis for the MgAl2-xO4:xCr3+(0 ≤ x ≤ 0.05) nano crystalline was performed using X-ray Diffraction, Fourier Transform Infrared Spectroscopy, Field Emission Scanning Electron Microscope, Diffuse Reflectance Spectra, Excitation and Emission Spectra. The powders calcined at 1100 °C were spherical with the average particle size of 90 nm, which were suitable for the preparation of the transparent ceramics. The crystal field, electron-vibration coupling and energy levels splitting of MgAl2O4: Cr3+ were discussed. The Cr3+ was suited in a strong crystal field, and the value of Dq/B = 3.9. At 457 nm excitations, the characteristic zero phonon lines appeared at 690 nm with the FWHM about 8 nm. The quenching concentration of Cr3+ was about 0.04.
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