Magnetic Susceptibilities and Ionic Moments in the Palladium and Platinum Groups

Abstract

Susceptibility measurements have been made on Ru, Rh, Pd, Os, Ir, and Pt and some of their compounds over a range of temperatures by means of an improved Curie balance.Pd and Pt are found to follow approximately a Curie-Weiss law. Ru, Rh, Os, and Ir are found to have paramagnetic susceptibilities which increase with temperature.Ru${\mathrm{Cl}}_{3}$ and Ir${\mathrm{O}}_{2}$ are found to follow a Curie-Weiss law which gives for the ion ${\mathrm{Ru}}^{3}$ a moment of 9.8 Weiss magnetons per mole and for ${\mathrm{Ir}}^{4}$ 13.8. The spectroscopically predicted value for each ion is 29.4. The paramagnetic susceptibility of ${\mathrm{Rh}}_{2}$${\mathrm{O}}_{3}$ is found independent of temperature while that of Ru${\mathrm{O}}_{2}$ increases rapidly with temperature. Rh${\mathrm{Cl}}_{3}$ is found to have an unmeasureably small susceptibility over the temperature range investigated. Ir${\mathrm{Cl}}_{3}$ and Pt${\mathrm{Cl}}_{2}$ are diamagnetic with susceptibilities independent of temperature.