Optical properties of glass coatings containing Fe and Co

Structural and physical properties of cobalt nanocluster composite glasses

“…However, that difference is very small, and experimental findings showed that the preferred Co 2þ site depends on the concentration of cobalt ions too [4]. Starting from the Co 2þ absorption band wavelength positions reported by Duran et al [5], in our samples the tetrahedral site seems to be slightly preferred. Even though less marked, the absorption bands related to the presence of Co 2þ ions are detectable also in the 25as and 40as samples, indicating the presence of cobalt oxide and/or silicate in the as-deposited samples.…”

Preparation of spherical silica particles by St?ber process with high concentration of tetra-ethyl-orthosilicate

“…Table 1. The very intense and broad band appearing at 1082-1114 cm À1 is assigned to asymmetric stretching vibrations of Si-O-Si [28], which reveals that a dense silica network was formed. On the other hand, one can see the other important infrared vibrations of silica in Fig.…”

Synthesis and Characterization of Mesoporous Hybrid Silica-Polyacrylamide Aerogels and Xerogels

“…Besides, the Si-O in-plane stretching vibrations of the silanol groups appear at 956 cm -1 [43]. The intense and broad band at 1,090-1,080 cm -1 and the shoulder at around 1,200 cm -1 are attributed to the transversal optical (TO) and longitudinal optical (LO) modes of the Si-O-Si asymmetric stretching vibrations of the dense silica network, where oxygen atoms play the role of bridges between each two silicon sites [44]. The Si-O-Si symmetric stretching vibrations appear at 801 cm -1 [10] and its bending mode appears at 460 cm -1 [45].…”