ИСТИНА

The paper deals with the study inspired by the fact that in most solid hydrogen solutions, both diluted and concentrated (hydrides), hydrogen is in the form of atoms. There are, however, solid solutions in which hydrogen is contained in molecular form. Greater solubility of hydrogen was found in amorphous magnesium silicates and in SiO2. The scientific field is promising because the solid hydrogen solutions in quartz glass and amorphous magnesium silicates are a new class of materials containing large amounts of molecular hydrogen at high pressures. It is known that there are amorphous calcium silicates CaySiO2+y having the same cation concentrations and near-order structure as magnesium silicates. It is shown that solid hydrogen solutions based on them must have the same physical and chemical properties as solid solutions of MgySiO2+y-XH2. The aim of the work is synthesis of solid solution Ca0.3SiO2.3-H2, determination of hydrogen content in it by thermodesorption method and study of the state of H2 molecules by Raman light scattering method and comparison of the obtained results with data on solid hydrogen solutions in amorphous Mg0.3SiO2.3 and quartz glass. Solid solutions 0 °C. The concentration of hydrogen X=0.33 in the amorphous silicate Ca0.3SiO2.3 was lower than the amount of hydrogen dissolved in quartz glass (X=0.6). The solid solution Mg0.3SiO2.3-0.5H2 released a significant part of hydrogen at temperatures above 0 °C. Such a different amount of dissolved hydrogenas well as different kinetics of its release, indicate a different structure of their amorphous lattices, and, consequently, a different number and size of interatomic cavities available for the introduction of hydrogen. The Raman spectra of solid solutions Ca0.3SiO2.3-0.34H2 and SiO2-0.6H2 were also studied and the Raman spectrum of solid solution Mg0.3SiO2.3-0.5H2 was given for comparison. All three spectra have a line in this frequency range, indicating that the hydrogen in all three silicates is dissolved as an H2 molecule. However, the appearance of these lines differs from each other. The result may indicate that the interaction of hydrogen molecules with the silicate lattice in all three silicates is different from each other.