Ferromagnetism of Mn-doped ZrO2-x Powder at Room Temperature
The study aims to explore the origin of the room-temperature ferromagnetism of ZrO2 systems doped with transition metal elements.Undoped and Mn-doped ZrO2-x nanopowders were prepared by the precipitation-thermite reduction method.Their crystal structure,morphology,chemical state and oxygen defects were tested by the methods of XRD,TEM and XPS,and their ferromagnetism at room temperature was analyzed.It is found that the undoped and 5％Mn-doped powders have a monoclinic phase structure,while 20％Mn-doped powders have a cubic phase structure.With the increase of Mn,the oxygen defect concentration increases from 56.7％to 58.6％.The magnetization of the undoped ZrO2 powder is 0.458 7 emu·g-1,and is reduced to 0.144 3 emu·g-1by the addition of Mn.This study provides a reference for the magnetic ordering of dilute magneto-oxide semiconductors and benefits the design of magnetic and new multifunctional materials.
dilute magnetic oxidesMn-ZrO2-xthermite reductionroom temperature ferromagnetismoxygen deficiency
NETL
NSTL
万方数据
