论文标题
MG金红石TiO2纳米颗粒中的D0铁磁性
d0 Ferromagnetism in Mg-doped Rutile TiO2 Nanoparticles
论文作者
论文摘要
为了富含氧化物材料中D0磁性面积，我们已承诺研究掺杂MG的TIO2化合物。通过固态反应途径制备Ti1-XMGXO2（X = 0、0.02、0.04和0.06）纳米颗粒。这些样品的X射线衍射（XRD）模式表明Tio2的四方金红石结构的单相。 XRD模式的细化表明，与Mg掺杂时的纯TiO2相比，晶体学晶格参数没有变化，这表明MG2+离子不进入核心晶粒并形成核心/壳结构。 SEM观察结果揭示了纳米颗粒在150-200 nm范围内的均匀形态。这些化合物的磁性能的测量表明，纯TIO2和TI0.98MG0.02化合物表现出顺磁行为，Ti0.96mg0.04化合物表现出与主导磁磁相叠加的铁磁（FM）相。然而，Ti0.94MG0.06化合物表现出FM磁磁性过渡，FM过渡温度为180.2 K.零场和田间冷却磁化数据的测量表明，X = 0.06的低温磁性不可逆性，并归因于竞争的AFM（CORE）（CORE）（CORE）（CORE）和FM（Shell）和FM（Shell）和FM（Shell）。在各种温度下的滞后曲线的测量表明域壁固定和交换偏置行为。
In a quest of enriching the area of d0 magnetism in oxide materials, we have undertaken to study Mg-doped TiO2 compounds. The Ti1-xMgxO2 (x=0, 0.02, 0.04 and 0.06) nanoparticles were prepared by solid-state reaction route. The X-ray diffractions (XRD) patterns of these samples indicate single phase of tetragonal rutile-structure of TiO2. The refinement of the XRD patterns reveals no change in the crystallographic lattice parameters in comparison to pure TiO2 upon Mg doping and it indicates that Mg2+ ions do not enter core grains and form core/shell structure. SEM observations reveal the uniform morphology with nanometric grains in the range of 150-200 nm. The measurement of magnetic properties of these compounds indicates that pure TiO2 and Ti0.98Mg0.02 compounds exhibit paramagnetic behavior and Ti0.96Mg0.04 compound exhibits ferromagnetic (FM) phase superimposed with the dominating paramagnetic phase. However, Ti0.94Mg0.06 compound exhibits ferromagnetic to paramagnetic transition with FM transition temperature of 180.2 K. The measurements of zero field and field cooled magnetization data indicate low temperature magnetic irreversibility for x=0.06 sample and it was attributed to the competing AFM (core) and the FM (shell) interactions. The measurement of hysteresis curves at various temperatures indicates domain wall pinning and an exchange-bias behavior.
