Perceiving impressive optical properties of ternary SiO2-TiO2-ZrO2:Eu3+ sol-gel glasses with high reluctance for concentration quenching: An experimental approach

Development of Thick Superhydrophilic TiO2–ZrO2 Transparent Coatings Realized through the Inclusion of Poly(methyl methacrylate) and Pluronic-F127

“…The FTIR spectra (Figure ) of the samples show a small peak at 460 cm –1 corresponding to the Ti–O vibrations . The low-frequency band at 930 cm –1 is attributed to Ti–O–Ti stretching vibrations. − The weak band observed at 652 cm –1 corresponds to the Zr–O–Ti bond, which authenticates the composite formation . The broad band at 3241 cm –1 in both spectra depicts the bending vibrations of OH groups originating from the moisture adsorbed on PMMA.…”

“…The peaks at 428, 886, and 951 cm –1 belong to TiO 2 , whereas ZrO 2 peaks are observed at 186, 818, and 565 cm –1 . 22,25−27 In the spectra of both films, the peak at 663 cm –1 is observed, which is characteristic for both anatase-TiO 2 and monoclinic-ZrO 2 . 28 Thus, Raman spectra of composite films show peaks corresponding to both anatase-TiO 2 and monoclinic-ZrO 2 .…”

“…The C–O–C stretching vibrations arising from the copolymer PF127 also exist at 1067 cm –1 , which overlaps with the Ti–O bond vibrations. 21,22 The additional peak at 1375 cm –1 represents the presence of CH 2 and C–C bonds of PF127. The increase in the intensity of absorption is mainly seen at 1278, 2873, and 2950 cm –1 in TZPPF.…”

“…Using group theory, six active Raman modes A 1g + 2B 1g + 3E g are predicted for tetragonal ZrO 2 in the range 100–1000 cm –1 , whereas monoclinic ZrO 2 shows 18 active bands like doublet peak at 180 cm –1 and so forth. 22 TiO 2 mainly exists in two forms: anatase and rutile. Raman fundamental modes for anatase TiO 2 are appearing at 144 (E g ), 399 (B 1g ), 519 (B 1g ), and 639 cm –1 (E g ), respectively, whereas those of rutile occur at 143 cm –1 (B 1g ), 447 cm –1 (E g ), 612 cm –1 (A 1g ), and 826 cm –1 (B 2g ).…”

Studies of Sol-Gel Evolution and Distribution of Eu3+ Ions in Glass–Ceramics Containing LaF3 Nanocrystals Depending on Initial Sols Composition

“…As a result, this low temperature approach allows for the fabrication of nano-glass-ceramics with a greater fluoride crystal fraction. Additionally, sol-gel processing offers a high degree of compositional and homogeneity control inherent with the synthesis being performed in a liquid phase, ensuring easy fabrication in comparison with the conventional melt-quenching method, in which phase separation in glass could be observed (related to the immiscibility of fluorine in a glassy oxide host) [43][44][45].…”