Next Article in Journal
Pressure-Induced Transformation of Graphite and Diamond to Onions
Next Article in Special Issue
Thickness-Dependent Strain Rate Sensitivity of Nanolayers via the Nanoindentation Technique
Previous Article in Journal
Synthesis and Characterization of Perovskite-Type [K1−xNax]MgF3 Mixed Phases via the Fluorolytic Sol-Gel Synthesis
Previous Article in Special Issue
Nanoindentation-Induced Pile-Up in the Residual Impression of Crystalline Cu with Different Grain Size
Open AccessCommunication

A Study of Extended Defects in Surface Damaged Crystals

1
IMEM Institute, National Research Council, 43124 Parma, Italy
2
National Institute of Materials Physics, 077125 Magurele, Romania
*
Author to whom correspondence should be addressed.
Crystals 2018, 8(2), 67; https://doi.org/10.3390/cryst8020067
Received: 7 November 2017 / Revised: 9 January 2018 / Accepted: 24 January 2018 / Published: 30 January 2018
(This article belongs to the Special Issue Crystal Indentation Hardness)
We have analyzed by transmission electron microscopy silicon and GaAs crystals polished with sandpapers of different grain size. The surface damage induced a crystal permanent convex curvature with a radius of the order of a few meters. The curvature is due to a compressive strain generated in the damaged zone of the sample. Contrary to what was reported in the literature, the only defects detected by transmission electron microscopy were dislocations penetrating a few microns from the surface. Assuming the surface damage as a kind of continuous indentation, a simple model able to explain the observed compressive strain is given. View Full-Text
Keywords: curved crystals; surface damaged crystals; dislocation generation; crystal indentation curved crystals; surface damaged crystals; dislocation generation; crystal indentation
Show Figures

Figure 1

MDPI and ACS Style

Ferrari, C.; Ghica, C.; Rotunno, E. A Study of Extended Defects in Surface Damaged Crystals. Crystals 2018, 8, 67.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop