Magnetic Properties of ( V 1 − x Cr x ) 2 O 3

摘要: The magnetic susceptibility of the ${({\mathrm{V}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x})}_{2}{\mathrm{O}}_{3}$ system ($0\ensuremath{\le}x\ensuremath{\le}1$) has been studied over temperature range 4.2-1000 \ifmmode^\circ\else\textdegree\fi{}K. For $0\ensuremath{\le}xl0.035$, data clearly indicate both high-temperature transition from a paramagnetic insulating to metallic state with decreasing and sharp low-temperature phase antiferromagnetic phase. Separation total into temperature-independent Van Vleck term temperature-dependent ${\ensuremath{\chi}}_{d}$ yields Curie-Weiss behavior for ${\ensuremath{\chi}}_{d}$. As $x$ increases 0 0.035, extrapolated Curie decreases 600 350 \ifmmode^\circ\else\textdegree\fi{}K effective moments $2.96{\ensuremath{\mu}}_{B}$ $2.30{\ensuremath{\mu}}_{B}$ per ion. change ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$-type structure ${\mathrm{Cr}}_{2}$${\mathrm{O}}_{3}$ type occurs in region $0.21\ensuremath{\le}x\ensuremath{\le}0.45$. are consistent picture developed pure Cr-doped ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ on basis resistivity x-ray investigations at atmospheric elevated pressures.