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Ferroelastic shear bands in Pb3
8. P. M. Solomon, B. A. Bryce, M. A. Kuroda, R. Keech, S. Shetty, T. M. Shaw, M. Copel, L.-W. Hung, A. G. Schrott, and C. Armstrong, Nano Lett. 15, 2391 (2015).
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We report shear bands as a precursor structure of deformation twinning in Pb3(PO4)2. Atomic force microscopy shows “slip-line” like traces on the surface of untwinned regions of the sample. The traces are shear bands oriented along twin boundaries of the ferroelastic-C2/c transition. Computer simulations reproduce the shear band patterns and show that each shear band is a precursor embryo of a twin wall that forms under higher shear stress. This observation reveals the structural origin of twin boundaries under stress conditions just before ferroelastic switching occurs.
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