Spectra Of VO2 Research Articles

Paramagnetic resonance of VO2+, Cr3+and Fe3+in zoisite

The paramagnetic resonance spectrum of VO2+, Cr3+ and Fe3+ in blue zoisite (tanzanite) shows these ions to substitute for Al3+ in two sets of very distorted octahedral sites. The spectra can be fitted with spin Hamiltonians of rhombic symmetry. Colour differences correlate with differences in the vanadium spectra.