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The threshold crack speed in silicon may be due to a localized phase transformation of the lattice at the crack tip from six-membered rings to a 5-7 double ring.
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The speed threshold arises from a 6-ring to 5-7 double-ring transformation at the crack tip
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Markus J. Buehler et al., “Threshold Crack Speed Controls Dynamical Fracture of Silicon Single Crystals”, Physical Review Letters 99 (2007), doi:10.1103/physrevlett.99.165502; Abstract. Scope: Silicon crack tip, ReaxFF reactive MD
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Markus J. Buehler, Harvey Tang, Adri C. T. van Duin, William A. Goddard. Threshold Crack Speed Controls Dynamical Fracture of Silicon Single Crystals. Physical Review Letters 99 (2007). doi:10.1103/physrevlett.99.165502
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Threshold Crack Speed Controls Dynamical Fracture of Silicon Single Crystals
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Here we show that this threshold crack speed may be due to a localized phase transformation of the silicon lattice from 6-membered rings to a 5-7 double ring at the crack tip.
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Abstract of Threshold Crack Speed Controls Dynamical Fracture of Silicon Single Crystals, as read
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Markus J. Buehler et al. 2007 claim: The speed threshold arises from a 6-ring to 5-7 double-ring transformation at the crack tip
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