Competition between photorelaxation and photoexcitation in chalcogenide glasses and the effect of aging

Direct investigation of silver photodissolution dynamics and reversibility in arsenic trisulphide thin films by atomic force microscopy

“…Photoinduced surface oxidation is a commonly observed phenomenon when irradiation is performed in air, which may even lead to phase separation as found from XPS studies [8]. Structural relaxation may also contribute to such variations on the surface [14,15]. Spatial and temporal variations for Ag photodissolution have been detected in transmission spectra by Tsiulyanu et al, which were attributed to local variations in the time during photodissolution at which the Ag film reaches a critical thickness for transmission [10].…”

Positron Annihilation Lifetime Spectroscopy Measurement of Ge₅As₃₇S₅₈ Glass

“…The size of nanovoids can be determined using the Liao's et al [4] expression for 2 τ -R correlation for radius…”

“…Chalcogenide glasses as typical representatives of the topologically non-ordered solid state are characterized by thermodynamic metastability. Glassy structure is characterized by excess of free volume or, which is equivalent by an excess of enthalpy, an excess of configuration entropy when comparison is made with corresponding thermodynamic equilibrium state [3][4][5]. Natural physical ageing leads to the consolidation of the glass structure [6].…”

Role of annealing temperature on optimizing the linear and nonlinear optical properties of As40Se50Ge10 films

“…13,14 The aging effect showed both photodarkening and photorefraction can be possible only in aged As-S-Se glasses while they are prevented in freshly annealed one. 15 The physical aging becomes slower with year and it is very difficult to identify the completion of physical aging aer long years. 16 The main reason for the physical aging in chalcogenide materials is the thermodynamic instability and excess free enthalpy below their glass transition temperature (T g ).…”