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采用三层夹心靶结构,利用铜箔与抛光蓝宝石之间良好的接触条件,使用辐射式高温计观测到c取向蓝宝石在130~172 GPa冲击高压下的红外辐射。实验信号显示,位于近红外波段的蓝宝石冲击辐射随着压力的增加而变强;强度对比显示,蓝宝石的近红外发射强于界面发射。基于冲击作用下滑移带的温度高于冲击平衡温度的概念,将蓝宝石体内滑移带温度作为蓝宝石发射温度代入线性吸收公式,从而将蓝宝石发光强度的增加和界面冷却引起的发光强度下降相结合;将得到的界面一蓝宝石发射强度数值模拟结果与实验结果相比较,发现二者能够重合。由实验信号的上升趋势得到三个压力下0.85μm近红外波长处蓝宝石的冲击吸收系数数值。 相似文献
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A distinct optical emission from the Rh203 (Ⅱ) structural sapphire is observed under shock compression of 125, 132, and 143 GPa. The emission intensity continuously increases with the thickness of shocked sapphire. The colour temperature is determined to be about 4000 K, which is obviously smaller than the reported value of the alpha phase alumina at the pressures below 80 GPa. The present results suggest that the structural transformation will cause an obvious change of optical property in sapphire. 相似文献
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