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Mechanical properties of layered InSe and GaSe single crystals

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7 Author(s)
Mosca, D.H. ; Departamento de Fı´sica-UFPR, Laboratório de Nanoestruturas e Sensores, Centro Politécnico C.P. 19091, 81531-990 Curitiba PR, Brazil ; Mattoso, N. ; Lepienski, C.M. ; Veiga, W.
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The mechanical properties of InSe and GaSe single crystals have been studied by means of nanoindentation tests. Both bulk crystals are well ordered and present a predominant γ-type interlayer stacking sequence as determined by x-ray diffraction and transmission electron microscopy measurements. The course of plastic deformation induced in the crystals by application of a definite shear stress through the penetration of a Berkovich tip indicates that the deformation occurs predominantly by pop-in events along easy slip directions having a fairly elastic character between displacements. Hardness anisotropy along crystal axes is clearly seen and the measured elastic modulus presents a discrepancy smaller than 5% in comparison with theoretical calculations performed using previous experimental values of the elastic constants. © 2002 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:91 ,  Issue: 1 )