Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (6): 1242.doi: 10.7503/cjcu20180795
• Physical Chemistry • Previous Articles Next Articles
CAO Peiming1, YOU Jinglin1(), ZHOU Candong2, LU Liming3, WANG Jian1, WANG Min1, DING Yani1, XU Yandong1
Received:
2018-11-26
Online:
2019-06-10
Published:
2019-03-27
Supported by:
CLC Number:
TrendMD:
CAO Peiming,YOU Jinglin,ZHOU Candong,LU Liming,WANG Jian,WANG Min,DING Yani,XU Yandong. In-situ Studies of Microstructure of CaF2-Al2O3-MgO Electroslag by Raman Spectroscopy and 27Al MAS NMR†[J]. Chem. J. Chinese Universities, 2019, 40(6): 1242.
Fig.1 XRD patterns of the powdered S-6530 crystal and glass samples a. Pre-melted S-6530 crystal sample produced by Baosteel; b. S-6530 glass sample prepared by rapid quenching at a cooling rate of 300 K/s.
MgAl2O4 | CaAl4O7 | ||||
---|---|---|---|---|---|
νexp./cm-1 | νcal./cm-1 | Vibrational mode | νexp./cm-1 | νcal./cm-1 | Vibrational mode |
— | 302 | Lattice vibration | 253 | 261 | Lattice vibration |
411 | 385 | [AlO6] octahedron stretching vibration | 412 | 430 | Al—O—Al bending vibration |
537 | 550 | [AlO6] octahedron deformation vibration | 461 | 470 | Al—O—Al bending vibration |
667 | 674 | [AlO6] octahedron respiratory vibration | 660 | 663 | Al—O—Al bending vibration |
790 | 783 | Al—O—Al bending vibration | 818 | 820 | O—(Al)3 stretching vibration |
— | — | — | 904 | 904 | O—(Al)3 stretching vibration |
Table 1 Assignment of the major Raman-active vibration modes for MgAl2O4 and CaAl4O7 of S-6530 crystal
MgAl2O4 | CaAl4O7 | ||||
---|---|---|---|---|---|
νexp./cm-1 | νcal./cm-1 | Vibrational mode | νexp./cm-1 | νcal./cm-1 | Vibrational mode |
— | 302 | Lattice vibration | 253 | 261 | Lattice vibration |
411 | 385 | [AlO6] octahedron stretching vibration | 412 | 430 | Al—O—Al bending vibration |
537 | 550 | [AlO6] octahedron deformation vibration | 461 | 470 | Al—O—Al bending vibration |
667 | 674 | [AlO6] octahedron respiratory vibration | 660 | 663 | Al—O—Al bending vibration |
790 | 783 | Al—O—Al bending vibration | 818 | 820 | O—(Al)3 stretching vibration |
— | — | — | 904 | 904 | O—(Al)3 stretching vibration |
Fig.6 Experimental(a, b) and calculated(c—e) Raman spectra of S-6530 glass a. Original Raman spectrum of S-6530 glass; b. smoothed and deconvoluted Raman spectra of S-6530 glass; red line: cumulative fit peak; green line: fit peak; c. Na7AlO5(C) cluster; d. Na30Al18O42(B) cluster; e. Na30Al18O42(A) cluster.
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