Experimental investigation into polycrystalline and single-crystal diamonds under negative pressures formed by picosecond laser pulses |
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| Authors: | S A Abrosimov A P Bazhulin A P Bolshakov V I Konov I K Krasyuk P P Pashinin V G Ralchenko A Yu Semenov D N Sovyk I A Stuchebryukhov V E Fortov K V Khishchenko A A Khomich |
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| Institution: | 1. General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russia
2. Institute of High Temperatures Scientific Association (IVTAN), Russian Academy of Sciences, Izhorskaya ul. 13/19, Moscow, 127412, Russia
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| Abstract: | Results of the experimental investigation of the spallation phenomenon in polycrystalline and single-crystal synthetic diamond are presented. The shock-wave action on the target was formed by a laser pulse with a duration of 70 ps using a Kamerton-T installation. To attain the ablation pressure of 0.66 TPa on the face surface of the target, the laser radiation of the Nd:glass laser (second harmonics λ = 527 nm, the pulse energy is 2.5 J) was used at intensity up to 2 × 1013 W/cm2. The attained maximal spall strength of diamond σ* ～ 16.5 GPa is 24% of the theoretical ultimate strength. The Raman scattering indicates that a small amount of crystalline diamond is graphitized in the spall region on the back target side. |
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