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Hardness, toughness, and scratchability of germanium-selenium chalcogenide glasses

Abstract : Ge-Se chalcogenide glasses are characterized by relatively low hardness (0.39-2.35 GPa) and low fracture toughness (0.1-0.28 MPa.m(1/2)). Actually, the hardness of chalcogen-rich glasses is low enough so that the brittleness parameter, B = H/K-c, is lower than that of silicate glasses. Whereas hardness and Young's modulus increase with increasing germanium contents, fracture toughness follows a trend similar to that of the density and exhibits a maximum for the Ge20Se80 composition, which corresponds to the rigidity percolation threshold. Optical microscopy and atomic force microscopy observations suggest that the indentation deformation proceeds by a localized shear deformation phenomenon. Glasses in the chalcogen-rich region behave viscoelastically at room temperature. As a consequence, an increase of the loading time results in a decrease of hardness and toughness.
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Submitted on : Monday, May 4, 2015 - 10:49:47 AM
Last modification on : Thursday, March 5, 2020 - 2:06:17 PM

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  • HAL Id : hal-01148143, version 1

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Jean-Pierre Guin, Tanguy Rouxel, Jean-Christophe Sangleboeuf, I. Melscoet, J. Lucas. Hardness, toughness, and scratchability of germanium-selenium chalcogenide glasses. Journal of the American Ceramic Society, Wiley, 2002, 85 (6), pp.1545--1552. ⟨hal-01148143⟩

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