拉曼光谱
相变
拉曼散射
钒
相(物质)
结晶学
化学
八面体
Atom(片上系统)
材料科学
晶体结构
凝聚态物理
无机化学
光学
物理
计算机科学
嵌入式系统
有机化学
作者
Rekha Rao,T. Sakuntala,A. M. Shaikh,S. K. Deb
标识
DOI:10.1016/j.jssc.2007.07.023
摘要
The reported pressure-induced amorphization in α-NaVO3 has been re-investigated using Raman spectroscopy. Discontinuous changes are noted in the Raman spectrum above 5.6 GPa implying large structural changes across the transition. The decrease in frequency of the V–O stretching mode across the transition suggests that the vanadium atom may be in octahedral coordination in the high pressure phase. Excessive broadening of the internal modes is observed above 6 GPa. New peaks characteristic of a crystalline phase gain in intensity at higher pressures in the bending modes region; however, the transformation is not complete even at 13 GPa. Co-existence of phases is noted over a significant pressure range above the onset of transition. Pressure released spectrum is found to be a mixture of crystalline α-phase, traces of crystalline β-phase and highly disordered phase consisting of V–O units in five- and six-fold coordination.
科研通智能强力驱动
Strongly Powered by AbleSci AI