Infrared Spectra of Several New Lanthanide Oxide-Silicate Glasses

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Abstract
The preparation and the infrared spectra of 10 new lanthanide oxide‐silicate glasses are reported. The three strongest regions of absorptions in the base glass (SiO2/Na2O/CaO) are maintained, although some shifts in frequencies do occur with the addition of lanthanide oxides. The 1050 cm−1 absorption in the base glass, assigned as the silicon‐oxygen stretching mode within the SiO4 tetrahedron, shifts toward lower frequency by about 10–25 cm−1; the silicon‐oxygen stretching between tetrahedra at 780 cm−1 and the silicon‐oxygen bending modes at 475 cm−1 do not show any significant shifts. Evidence is presented that crystallization may occur in these glasses on standing, and this may be connected with the half‐filled shell effect in the lanthanide series.

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