摘要
利用轻气炮平面波加载技术结合多通道辐射高温计技术以及瞬态光谱技术,在40—60GPa压力区间同时获得了蓝宝石冲击发光的时间分辨光谱和连续波长分布光谱.结果表明,在该压缩区间蓝宝石发光光谱的波长分布具有普朗克灰体分布特征,是一种典型的热辐射现象.辐射色温与该压力区间蓝宝石熔化温度接近,支持剪切带发光观点,认为剪切带的形成可能与蓝宝石单晶的位错和缺陷有关.对冲击压缩蓝宝石的剪切带发光温度接近熔化温度的观点,用一维塑性流的热方程给出了合理的解释.
The spontaneous spectroscopic and radiation pyrometer techniques are combined together to study the light emission of shocked sapphire and its time dependence under a compression of 41--87 GPa. The results are confirmed that the shock induced light emission from sapphire can be attributed to the thermal radiation from the shear bands because of partial dislocation damage. The spectral distribution matches well with the equilibrium thermal radiation of Planck grey-body feature. The fact that of the radiation color temperature is close to the corresponding melting temperature can be explained reasonably by the thermal equations of the plastic flow.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第22期345-350,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:10874141
10974160)
中央高校基金(批准号:SWJTU112T23)资助的课题~~
关键词
蓝宝石
冲击发光
剪切带
温度
sapphire, shock-induced light emission, shear band, temperature
