Data for photoluminescence spectra of natural Cr3+-doped MgAl2O4 spinel during order-disorder transition

Photoluminescence (PL) spectra of natural Cr3+ doped MgAl2O4 spinel from Tanzania were taken during its order-disorder transition (ODT) process. Samples were changed their disordered degree by heating treatment. PL spectra were taken at the liquid nitrogen (LN) temperature (~77 K) using a 532 nm laser excitation. Spectra from different states were compared with each other and R-line and N-line ratio was used to illustrate the disordered degree of spinel during ODT process. The data fully displayed the details of the spectral variation with high quality. It can be used as a reference for other similar researches, such as spinel PL characterization, ordered degree of synthetic spinel single crystal or ceramics materials, thermal history of spinel, and non-destructive identification of natural and heated spinel gemstones.