摘要
为研究动高压加载下TiO2的冲击改性特点,利用平面冲击波加载技术对TiO2粉体进行冲击压缩实验,以XRD和Raman光谱为主要手段,对样品的结构和热处理相变行为进行了表征和比较。结果表明:冲击压缩作用使TiO2的衍射峰宽化,在样品中形成较大的晶格畸变和应力;飞片速度对TiO2晶粒的粉碎细化效果影响较大。经飞片2258 m/s高速冲击后,微结构中的晶格畸变和应力使TiO2在热处理时的相变温度降低约100℃。TiO2在高速冲击后生成了一种具有锆钛矿结构的同素异构体。
For studying the shock-modified characteristics under dynamic high pressure, TiO2 powders were shock-compressed using planar shock-wave-loading technology, and the structures and annealing phase transition of impacted samples were characterized and compared by X-Ray diffraction （XRD） and Raman spectrum analysis. The results showed that, shock compression led to the diffraction peak broadening of TiO2 powders, which indicated greater residual lattice distortion and stress existed in TiO2 powders. And with the increase of velocity of flyer plate, the refining effect of shock wave on TiO2 grain became obvious. After compressed under flyer plate of 2258 m/s high-velocity, TiO2 powders were reduced the phase- transition temperature about 100 ℃ during annealing process because of crystal distortion and stress in microstructure. Moreover, the results of X-Ray diffraction indicated there was a new polymorph of titanium dioxide with srilankite structure in TiO2 powders after high-velocity compression.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2013年第8期1653-1657,共5页
Journal of Synthetic Crystals
基金
四川省科技厅项目(2010JY0090)
西南科技大学极端条件物质特性实验室开放基金(11zxjk03)
关键词
TIO2
冲击压缩
相变
晶格畸变
titania
shock compression
phase transition
lattice distortion
