快速压缩作用下橄榄石的结构稳定性

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、1073、1173 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。

Structural Stability of Olivine under Rapid Compression

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 873,973,1073 and 1173 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.