Study of the Structure of Vanadium in Soda—Boric Oxide Glasses

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Abstract
The EPR and optical spectra of vanadium in the Na2O–B2O3 glass system have been analyzed. It is found that the data can best be interpreted in terms of a vanadyl‐type structure in a ligand field of fourfold symmetry. Good correlation of the optical and EPR data is achieved through molecular orbital calculations, which provide a qualitative description of the behavior of the coordination sphere as the Na2O content of the glass is varied. The model proposed is one in which there is a dilation of the ligand shell corresponding to the boric oxide anomaly superposed on an over‐all tendency of the ligand—metal distance to decrease as [Na2O] increases. The hyperfine coupling terms as well as the g tensor and optical data support this model.

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