  We have performed hardness measurement experiments under different loads and
loading times by performing micro-indentation marks in the present work.
Chalcogenide glasses (ChGs) comprising Se$_{78}$Te$_{20}$Sn$_2$ and
Se$_{78-x}$Te$_{20}$Sn$_2$Zn$_x$ (where $x = 0, 2, 4, 6$) alloys are the
subject of micro-indentation tests in this work. We have utilized both
micro-indentation and optical microscopic methods to determine Vickers
hardness. Thermal glass transition phenomena have been identified through DSC
techniques. The modulus of elasticity (E), an essential mechanical property,
has been evaluated using established empirical equations. Further, we have
studied other mechanical parameters [e.g., minimal micro-void formation energy
(Eh), glass's fragility index (m), micro-void volume (Vh), etc.] and the
covalent character of the glassy system. Additionally, various physical
parameters, including density, molar volume, and compactness, have also been
determined.
