Magnetic Susceptibility Measurements of Rutile and the Magnéli Phases of the Ti-O System

Abstract

Magnetic-susceptibility measurements of the Magn\'eli phases of the Ti-O system show a change from weak covalent bond formation, through antiferromagnetic to paramagnetic-like behavior with increasing oxygen concentration. The reciprocal molar susceptibility plotted versus temperature indicates collective electron effects in all phases except Ti${\mathrm{O}}_{1.50}$ and Ti${\mathrm{O}}_{1.67}$. These exhibit noncooperative and cooperative semiconductor-to-metal transitions, respectively.