Structural and thermal properties of monolithic silica–phosphate (SiO2–P2O5) gel glasses prepared by sol–gel technique

Acid-based geopolymers: Understanding of the structural evolutions during consolidation and after thermal treatments

“…In acid-based geopolymers, the initial reactive mixture is composed of aluminum, silicon and phosphorous sources. To understand the various phases that could crystallize in temperature, the following section presents the different phases that form in glasses constituted of Al 2 O 3 - [28] that were characterized by FTIR [29,30] and NMR [31] spectroscopies. In the binary P 2 O 5 -Al 2 O 3 , the addition of Al 2 O 3 depolymerizes the phosphate glass, breaking the P-O-P bonds in favor of the more stable P-O-Al bonds.…”

Synthesis and Characterization of Triply Doped Nano-Composite Alumina-Phospho- Silicates SiO<sub>2</sub>-P<sub>2</sub>O<sub>5</sub>-Al<sub>2</sub>O<sub>3</sub> with Er<sup>3+</sup>, Sm<sup>3+</sup> and Yb<sup>3+</sup> Ions Prepared by Sol Gel Technique in Two Different Forms Thin Film a

“…The crystallite size of SPAE 1.2 Y 1.8 S 1.3 sintered at 900˚C for three hours was of the order of 44 nm for monolith sample. By decreasing the Sm 3+ ion concentrations the crystalline size was decreased [5] [11] [12]. It is also seems that the thin film SPAE 1.2 Y 1.8 S 1.3 sample sintered at 900˚C, gave smaller crystalline size than monolith sample giving the following value 31 nm.…”

“…Therefore, it is worth to investigate the sol-gel preparation process of the prepared samples that determine the highest concentration of rare earth allowed without running into uncontrolled crystallization and clustering problems. It is also of importance to underline the chemical durability of the materials as most of P 2 O 5 based compound suffers from its hygroscopic character [1]- [5].…”

Phosphosilicate–polyamidoamine hyperbranched polymer–Er3+ nanocomposite toward planar optical waveguide applications

“…Recently, silica‐gel‐based inorganic–organic hybrid materials have found widespread applications . Phosphorus materials and some polymers were doped in silica gel to enhance the performance of its hybrid materials to be used in versatile applications as wave guide materials. The used polymers included chitosan , poly (ethylene oxide; PEO) , and polyglycerol .…”