Beeinflussung der elektrischen Eigenschaften von Vanadiumdioxid-Pulver durch Reduktionsbehandlung

A reducing technique for a definite setting of the electrical resistivity and the switching voltage of vanadium dioxide powder samples is described. The dependence of the electrical behaviour on the reducing temperature, the grain size and the phase contaminations is reported. Investigations by metallographic, X-ray, electrical, and magnetic methods have shown that the change of the electrical resistivity is caused by a reducing of the VO₂ grains decreasing to the center of the grains. The oxygen content reaches the oxygen deficient VO₂ phase boundary or less at the grain surface.