Magnetic Properties of Ni in MgO; Ni exp +2 Ions and Magnetically Ordered Precipitates

摘要

Magnetic properties of Ni in MgO have been investigated, using a vibrating sample magnetometer. The samples were studied in two forms, as prepared with Ni ions in solution and chemically reduced with the Ni in microscopic precipitates. The initial materials exhibited paramagnetic behavior, having a Curie Law susceptibility with an effective moment per ion p = 3.08 mu /sub B/. (g = 2.18, with S = 1 for Ni exp +2 ions). Upon reduction, magnetic precipitates were formed, characterized by hysteresis and remanent moments. The observed low-temperature saturated moment per Ni of gS = 0.32 mu /sub B/, observed for several samples, as well as the temperature dependence of the saturation magnetization, indicates that the magnetic bahavior of the precipitates is rather different from bulk Ni. (ERA citation 06:032227)