Structural Stability of Olivine under Rapid Compression
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摘要: 结合不同的温度效应，研究了快速压缩过程对橄榄石结构稳定性的影响。分别在293、373、473、573、673、773 K下将橄榄石快速加压至3 GPa，在873、973、1 073、1 173 K下烧结橄榄石样品2 h后再在室温下快速加压至3 GPa。采用同步辐射X射线衍射、拉曼光谱、红外吸收光谱以及扫描电镜等技术分析了回收样品的结构和微观形貌。结果表明，上述过程中橄榄石结构均稳定，未发生由压力和温度导致的相变。橄榄石回收样品的微观形貌发生变化，晶粒细化。由于回收样品中存在残余应力以及晶粒细化，橄榄石的822 cm–1和854 cm–1拉曼特征峰出现了展宽和偏移。Abstract: The effect of rapid compression on the stability of olivine structure was studied in this work. In the first group, the olivine samples were rapidly compressed to 3 GPa at 293, 373, 473, 573, 673 and 773 K respectively. In the second group, the olivine samples were sintered for 2 h at 873, 973, 1 073 and 1 173 K and then were rapidly compressed to 3 GPa at room temperature. The structure of the recovered samples were analyzed by synchrotron radiation X-ray diffraction, Raman spectroscopy, infrared absorption spectrum and scanning electron microscopy. These results showed that the structure of olivine was stable and there were no phase transition caused by temperature and rapid compression. The micromorphology observation of recovered olivine indicated that the grains were refined. Due to the residual stress and grain refinement in the recovered samples, the Raman vibrational peaks of olivine (822 cm–1 and 854 cm–1 at room temperature) showed some broadening and displacement.
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Key words:
- olivine /
- rapid compression /
- Raman spectroscopy /
- synchrotron X-ray diffraction
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图 3 初始样品和不同温度下快压后回收橄榄石样品的同步辐射XRD谱
Figure 3. Synchrotron XRD patterns of initial sample and recovered olivine samples after rapid compression at various temperatures
图 4 不同温度下焙烧随即室温快压后回收的橄榄石样品同步辐射XRD谱
Figure 4. Synchrotron XRD patterns of recovered olivine samples after calcination and rapid compression at room temperature
图 5 不同条件下回收橄榄石的SEM图像
Figure 5. SEM images of recovered olivine samples at different conditions
图 7 不同温度下焙烧并室温快压后回收橄榄石样品的拉曼光谱
Figure 7. Raman spectra of recovered olivine samples after calcination and rapid compression at room temperature
图 8 不同温度下快压后橄榄石回收样品的拉曼光谱
Figure 8. Raman spectra of recovered olivine samples after rapid compression under different temperatures
图 9 不同条件下回收橄榄石样品的红外吸收光谱
Figure 9. Infrared spectra of recovered olivine samples at different conditions
表 1 镁橄榄石和橄榄石（阳原）常温常压拉曼振动模及对称性和归属[30-31]
Table 1. Comparison of the Raman shifts, symmetries and assignments between forsterite (Mg2SiO4 ) and olivine (Yangyuan)[30-31] (All data refer to room temperature and ambient pressure.)
No. Symmetry Assignment ν/cm–1 No. Symmetry Assignment ν/cm–1 Forsterite Olivine Forsterite Olivine 1 Ag T 183 10 B1g ν2 435 467 2 B1g T 192 11 Ag ν4 546 3 Ag T 226 12 B3g ν4 593 4 B2g T 243 13 B1g ν4 632 5 Ag T 305 14 Ag 0.6ν1 + 0.4ν3 825 822 6 B2g R 324 15 Ag 0.4ν1 + 0.6ν3 856 854 7 Ag T 330 16 B2g ν3 882 881 8 B2g R 366 17 B3g ν3 921 919 9 B3g R 375 18 Ag ν3 966 960 
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