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 f...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 Alg 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 microstruetural evolution of Cr：LiSrAlF6 from room temperature to its melting point is discussed based on its Raman spectra.展开更多
基金Project supported by the Key Program of the National Natural Science Foundation of China （Grant No. 50932005） and the Open Poject of Shanghai Key Laboratory of Modern Metallurgy and Materials Processing （Grant No. SELF-2009-01）.
文摘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 Alg 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 microstruetural evolution of Cr：LiSrAlF6 from room temperature to its melting point is discussed based on its Raman spectra.
