Structure-optical property correlations of arsenic sulfide glasses in visible, infrared, and sub-millimeter regions

Solid-state amorphization of As 45 S 55 alloy induced by high-energy mechanical milling

“…1). Instead of sharp crystalline reflexes of high-temperature -As4S4 polymorph, we observe only stretched halos typical for amorphous alloys of As-S system near As2S3 stoichiometry at 2Θ16.3°, 32° and 56° [35][36][37]. The first of them, the FSDP, is a manifestation of medium-range ordering in glassy systems [26].…”

Methods for prediction of refractive index in glasses for the infrared

“…The calculated index for our glasses using these sulfur glass coefficients is, in fact, very close to the 5.35 µm measured values (and 5 μm values interpolated with the Sellmeier equation) for As30, As33, and As36, though it is smaller than measured for As40 and As42. However, the decrease in index of As42 with respect to As40, explained in McCloy et al, 36 is not predicted using the polarizability model. This suggests that the connectivity between the atoms plays an additional role in the refractivity not accounted for in the LL model assigning only a single polarizability to each atom.…”

“…37 These systems represent two extremes in the sense that one is an oxide glass (PbO-Ga 2 O 3 -Bi 2 O 3 ), so methods that require oxide coefficients could be used. The other is a chalcogenide glass (As x S 100-x ) 36 with predominantly covalent bonding, so only atomic polarizability and refractivity models could be used. The compositions and measured densities of these glasses are shown in Table 2.…”

“…35 Normally this model is used to obtain E 0 and E d by performing a linear fit of (n 2 -1) -1 versus E 2 on measured index data. 1,36 However, it has been shown that the energy coefficients for a complex solid (i.e. glass) can be obtained by a weighted average of its constituents (i.e.…”

“…Details of the fabrication and measurements are provided elsewhere. 36 For these glasses, the measured refractive index was compared to:…”