Mechanical response of KD[sub 2x]H[sub 2(1-x)]PO[sub 4] crystals during nanoindentation

Kucheyev, S.O.; Siekhaus, W.J.; Land, T.A.; Demos, S.G.
March 2004
Applied Physics Letters;3/29/2004, Vol. 84 Issue 13, p2274
Academic Journal
The deformation behavior of rapidly grown tetragonal KD[sub 2x]H[sub 2(1-x)]PO[sub 4] (KDP and DKDP) single crystals, with a deuteration degree x of 0.0, 0.3, and 0.6, is studied by nanoindentation with a 1 μm radius spherical indenter. Within experimental error, the deformation behavior is found to be independent of the deuterium content and different for (001) and (100) surfaces. Multiple discontinuities (so-called “pop-in” events) in force-displacement curves are observed during indentation loading, but not during unloading. Slip is identified as the major mode of plastic deformation in DKDP, and pop-in events are attributed to the initiation of slip. © 2004 American Institute of Physics.


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