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Single-crystal sapphire was found to lose some of its original transparency in the near infrared (0.9 μm) when subjected to strong dynamic compression in the pressure range between 100–130 GPa (1–1.3 Mbar). Experimental evidence of this phenomenon is presented and discussed in relation to some of the other known properties of the crystal.
P. A. Urtiew (1974) studied this question.
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