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作 者:ZHANG NingChao LIU FuSheng PENG XiaoJuan ZHANG MingJian CHEN JunXiang
机构地区:[1]Laboratory of High Temperature and High Pressure Physics,Southwest Jiaotong University [2]National Key Laboratory of Shock Wave and Detonation Physics,Institute of Fluid Physics,Chinese Academy of Engineering Physics
出 处:《Science China Chemistry》2013年第3期562-567,共6页中国科学(化学英文版)
基 金:support provided by the National Natural Science Foundation of China (Grant Nos. 10874141,10974160 and 10299040);the Foundation of Center Universities (Grant No.SWJTU112T23)
摘 要:The measurement of emissions from the window material of sapphire was performed through multi-wavelength pyrometer and spontaneous spectroscopic techniques in the pressure range of 40 -120 GPa. The results showed that the spectral distribution with wavelength clearly fit well with the grey-body spectrum. We have analyzed the emissions and discovered they mostly came from the shear banding, which is a typical thermal radiation. The radiance intensity changing linearly with time revealed it was a volume effect. All of the data from pyrometer can be explained by the model of Boslough's study, especially for pres- sures over megabar. The color temperature of shocked sapphire changing with increased stress disagrees with the computed melt curve which is likely explained by the differcnt phase structures of sapphire.The measurement of emissions from the window material of sapphire was performed through multi-wavelength pyrometer and spontaneous spectroscopic techniques in the pressure range of 40-120 GPa.The results showed that the spectral distribution with wavelength clearly fit well with the grey-body spectrum.We have analyzed the emissions and discovered they mostly came from the shear banding,which is a typical thermal radiation.The radiance intensity changing linearly with time revealed it was a volume effect.All of the data from pyrometer can be explained by the model of Boslough's study,especially for pressures over megabar.The color temperature of shocked sapphire changing with increased stress disagrees with the computed melt curve which is likely explained by the different phase structures of sapphire.
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