The Phase Transition in VO₂

Magnetic properties in VO 2 have been studied in the temperature range from 100 to 380°K with the Mössbauer effect measurement of Fe 57 doped in VO 2 . Above and below the transition temperature, no internal field is observed. The observation indicates that VO 2 is paramagnetic even below the transition temperature and then it was concluded that the drastic transition in VO 2 from semiconductor to metal is caused by some origin other than the magnetic ordering. The nature of the chemical bond in VO 2 has been also discussed from the impurity effect on the magnetic susceptibility. The origin of the phase transition which appeared in V 2 O 3 and VO 2 was systematically discussed in the light of Goodenough's model.