EPR of VO2+, Cu2+ and Mn2+ Ions Doped in LiHSO4 Single Crystals

Abstract

The EPR spectra of VO 2+, Cu 2+ and Mn 2+ ions doped in LiHSO 4 single crystals are reported. The foreign impurities appear to displace Li + ions, which are situated in voids formed by the hexagonal closest packing of bigger sulphate ions in the crystal structure. VO 2+ and Mn 2+ show characteristic hyperfine structure but no hyperfine splitting was observed in the spectra of Cu 2+ ions. It appears that VO 2+ and Mn 2+ are situated in one kind of void situated in an ordered way. The Cu 2+ ions may be occupying both kinds of voids, distributed in an irregular fashion. The molecular orbital binding coefficients β2 and α2 are calculated in the case of VO 2+.