Investigation of the Cr:LiSrAlF6 crystal by high-temperature Raman spectroscopy |
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| Authors: | Wang Di Wan Song-Ming Zhang Qing-Li Sun Dun-Lu Gu Gui-Xin Yin Shao-Tang Zhang Guo-Chun You Jing-Lin and Wang Yuan-Yuan |
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| Institution: | Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;Shanghai Enhanced Laboratory of Ferro-metallurgy, Shanghai University, Shanghai 200072, China;Shanghai Enhanced Laboratory of Ferro-metallurgy, Shanghai University, Shanghai 200072, China |
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| Abstract: | In this paper, Cr-doped LiSrAlF6 crystals are investigated using high-temperature Raman spectroscopy and the single-crystal Raman spectra of Cr:LiSrAlF6 are analysed by factor group theory and comparison with other fluorides. The results indicate that Cr:LiSrAlF6 is stable below its melting point; Raman peaks located at 561, 322 and 250 cm-1 are assigned to the A1g modes of AlF6, SrF6 and LiF6 octachdra, respectively; with temperature increasing, Raman peaks associated with AlF6 octahedra shift towards low frequencies, while LiF6 and SrF6 octahedra are temperature-insensitive; around the crystal melting point, three new Raman peaks occur, which are associated with the AlF6 octahedral chain structure. Finally, the microstructural evolution of Cr:LiSrAlF6 from room temperature to its melting point is discussed based on its Raman spectra. |
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| Keywords: | Cr:LiSrAlF6 crystal high-temperature Raman spectroscopy crystal structure in situ investigation |
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