d0 Ferromagnetism in Ag-doped Monoclinic ZrO2 Compounds
arXiv:2011.13727 · doi:10.1016/j.vacuum.2020.109716
Abstract
Recently d0 or intrinsic ferromagnetism was believed to provide an alternative pathway to transition metal induced ferromagnetism in oxide. In pursuit of augmenting the area of d0 ferromagnetism; we have undertaken to study the crystal structure and magnetic properties of Ag-doped ZrO2 compounds. Polycrystalline samples of Zr1-xAgxO2 (with x=0, 0.02, 0.04, 0.06 and 0.08) were prepared by solid-state reaction route. All the prepared compounds are found to crystallize in monoclinic symmetry of ZrO2. In our study, pure ZrO2 compound exhibits paramagnetic behavior. However, the Ag-doped ZrO2 compounds exhibit ferromagnetic to paramagnetic transition. The Curie temperature was found to increase from 28.7 K for x=0.02 to 173.2 K for x= 0.08 doped ZrO2. Thus, the introduction of Ag in ZrO2 induces ferromagnetism with a large ThetaC. The measurements of hysteresis curves indicate that Ag doped ZrO2 compounds exhibit hysteresis loops with a coercivity of around 1350 Oe. Moreover, increase in Ag concentration resulted increase in the value of saturation magnetization (MS); the maximum value of MS was recorded as 0.01 μB/Ag ion for x= 0.06 sample. The sintering of sample at high temperature (13500C) diminishes the ferromagnetism and it leads to paramagnetic behaviour.
arXiv comment19 pages
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