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Influence of the mechanical and chemical thresholds on the microhardness of ternary chalcogenide glasses
Author(s) -
Chitralekha J.,
Srinivasan A.,
Chattopadhyay K.,
Gopal E. S. R.
Publication year - 1996
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221970209
Subject(s) - indentation hardness , chalcogenide , materials science , ternary operation , brittleness , vickers hardness test , tellurium , chalcogenide glass , composite material , metallurgy , mineralogy , microstructure , chemistry , computer science , programming language
The microhardness of Ge‐Sb‐Se, Si‐As‐Te, and Ge‐As‐Te glasses has been studied as a function of the average coordination number 〈r〉. A step‐like increase is observed in the Vickers hardness number (VHN) above 〈r〉 = 2.30 in Ge‐Sb‐Se glasses, and above 〈r〉 = 2.50 in Si‐As‐Te and Ge‐As‐Te glasses. This behaviour can be interpreted on the basis of the occurrence of a mechanical and chemical threshold in these glassy systems. The applicability of this technique to measure the elasto‐plastic properties of small and brittle samples such as tellurium‐based chalcogenide glasses is highlighted.