| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Research Abstract |
Properties of Sapphire at TPa regime are of great scientific interest. The EOS and conductivity of Sapphire at this condition are crucial to understand the interior structure of super-Earth exoplanets. Metallic transition of Sapphire is suggested to be similar to that of liquid Hydrogen (Mott-like transition). Then, we performed laser shock experiments on the Hugoniot measurements of Sapphire by
GEKKO system at Osaka University. Taking advantage of decaying shock feature, Hugoniot temperature and optical reflectivity were measured in a wide range of the pressure. The reflectivity increases gradually from around 0.6 TPa and reaches 15% at 1.3 TPa. The increase of the internal energy is observed at this regime, and the Hugoniot curve deviates from the isotherm. Obtained Hugoniot temperature shows little increase between 0.6 to 1 TPa. This trend cannot be seen in the SESAME EOS model and could be related to the dissociation of Sapphire.
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