Raman Spectra Study of Heating Treatment and Order-Disorder Transition of Cr3+-Doped MgAl2O4 Spinel
WANG Cheng-si1, Andy Hsitien Shen1*, LIU Yun-gui2, ZHANG Qian1
1. Gemmological Institute, China University of Geosciences, Wuhan 430074, China
2. School of Gemology and Material Technology, Hebei GEO University, Shijiazhuang 050031, China
Abstract：Order-disorder transition is one of the important properties of spinel, but seldom research can be found about it. One nature Burma pink spinel were tested by Raman spectroscopy, excited by 785 nm laser in the liquid nitrogen atmosphere to obtain the clear and sharp Raman spectra. In this way, one can avoid the 469 nm fluorescence peak induced by the 532 nm laser, and the thermal affection of the room temperature test. One nature pink Cr-doped MgAl2O4 spinel were used in this study. The Raman spectra were obtained after the samples were heated at different temperatures to present the process of Raman spectra variation during spinel order-disorder transition. The parameter analysis showed the results that: the Raman peaks of MgAl2O4 spinel are caused by 5 vibrational mode, Eg，T2g(1)，T2g(2)，N3 and Ag, at 407.8，312.4，667.5，720.0 and 769.0 cm-1; The parameter of Raman peaks have a sudden change at around 800 ℃, including the increase of HWFM of all the peaks and the relative intensities of the other peaks and the main peak Eg; the appearance of N3 peak; and position movement of T2g(1) (to the low wavenumber direction) and T2g(2)(to the high wavenumber direction) peaks with the disappearance of peak symmetry. This study indicates that the peak parameters of Raman peaks can be used to show the order-disorder transition of spinel, and it can be widely used in the identification of heat treated spinel gems.
王成思，沈锡田，刘云贵，张 倩. 拉曼光谱对含Cr镁铝尖晶石热处理及其有序-无序相变研究[J]. 光谱学与光谱分析, 2019, 39(01): 109-113.
WANG Cheng-si, Andy Hsitien Shen, LIU Yun-gui, ZHANG Qian. Raman Spectra Study of Heating Treatment and Order-Disorder Transition of Cr3+-Doped MgAl2O4 Spinel. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2019, 39(01): 109-113.
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