Spin Resonance of V2+, V3+, V4+, in a-AL2O3

摘要

Divalent vanadium has properties similar to those of trivalent chromium in sapphire, which has wide application in masers. The electron-spin reso¬nance absorption properties of vanadium sapphire are reported here. It is shown that vanadium normally is predominantly trivalent. with a small amount being in the tetravalent state. By x- or gamma-irradiation, vanadium is converted to the divalent state. The hyperfine-structure component separation for V2+, V3+, and V4+ are about 88, 110, and 140 gauss, respectively.nBecause of its readily recognizable spin-resonance signature due to its nuclear spin, and because of the ease of producing different oxidation states, it is suggested that vanadium may be a suitable probe with which to study ionization effects in certain solids.