Infrared Spectroscopy Study of Silver-Containing Composite Materials Based on Nanoporous Silicate Glass Doped with Tb³⁺ or Sm³⁺ Ions

Abstract—Composite materials (CMs) doped with AgI or AgBr and Tb³⁺ or Sm³⁺ ions are synthesized based on matrices of high-silica nanoporous glass (NPGs). The structure of the CMs is studied by IR spectroscopy in the frequency range of 4000 to 400 cm^–1. Bands corresponding to the Ag–O vibrations are found in the IR transmittance spectra of the CMs in the range of 604 to 592 cm^–1. The presence of bands is established, which is associated with the existence of O–Ln–OH, Ln–O–Ln, Ln–O–H, and Ln–O (Ln = Tb, Sm) bonds compared with the NPG and series of materials without rare-earth ions (terbium or samarium). The peaks corresponding to the Ag₂O and Sm₂O₃ oxides are found in the CMs at 940–936 and 640 and 640 cm^–1, respectively.