Pressure-Induced Amorphization and Recrystallization of SnI2

详细信息    查看全文

• 作者：Lu Wang ; Xiaoli Huang ; Da Li ; Fangfei Li ; Zhonglong Zhao ; Wenbo Li ; Yanping Huang ; Gang Wu ; Qiang Zhou ; Bingbing Liu ; Tian Cui
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：August 20, 2015
• 年：2015
• 卷：119
• 期：33
• 页码：19312-19317
• 全文大小：414K
• ISSN：1932-7455

文摘

The high-pressure behavior of SnI₂ has been investigated in a combined experimental and theoretical study by angle-dispersive X-ray diffraction, Raman scattering measurements, and ab initio calculations. Both the Raman and XRD results confirm that the SnI₂ crystal undergoes a gradual crystal to amorphous transition and subsequently recrystallizes to a new crystal structure upon compression. The intensity of the Sn鈥揑 symmetric stretching mode greatly decreases and manifests a red shift at 2.15 GPa in Raman spectra. The XRD patterns show a bonding break phenomenon before the pressure-induced amorphization. We propose that the bond breaking between neighboring layers leads to the formation of the amorphous phase under high pressure. The sample recrystallizes into a new high-pressure crystal phase at 33.18 GPa. The experimental and theoretical results provide a good candidate structure for the recrystallized phase with C2/m space group.