Kumar Shalendra, Kim Young Joo, Koo B H, Lee Chan Gyu
School of Nano and Advanced Materials Engineering, Changwon National University, 9 Sarim dong, Changwon-641-773, Korea.
J Nanosci Nanotechnol. 2010 Nov;10(11):7204-7. doi: 10.1166/jnn.2010.2751.
We report room temperature ferromagnetism in Ni doped CeO2 nanoparticles using X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM), and dc magnetization measurements. Nanoparticles of Ce(1-x)Ni(x)O2 (0.0 < or = x < or = 0.10) were prepared by using a co-precipitation method. XRD measurements indicate that all samples exhibit single phase nature with cubic structure and ruled out the presence of any secondary phase. Lattice parameters, strain and particle size calculated from XRD data have been found to decrease with increase in Ni doping. Inter-planner distance measured from HR-TEM images for different Ni doped samples indicate that Ni ions are substituting Ce ions in CeO2 matrix. Magnetization measurements performed at room temperature display weak ferromagnetic behavior of Ce(1-x)Ni(x)O2 (0.0 < or = x < or = 0.10) nanoparticles. Magnetic moment calculated from magnetic hysteresis loop was found to increases with Ni doping up to 7% and then start decreasing with further doping.
我们使用X射线衍射（XRD）、高分辨率透射电子显微镜（HR-TEM）和直流磁化测量方法，报道了镍掺杂二氧化铈纳米颗粒中的室温铁磁性。通过共沉淀法制备了Ce(1-x)Ni(x)O2（0.0 ≤ x ≤ 0.10）纳米颗粒。XRD测量表明，所有样品均呈现立方结构的单相性质，排除了任何第二相的存在。从XRD数据计算得到的晶格参数、应变和粒径随镍掺杂量的增加而减小。从不同镍掺杂样品的HR-TEM图像测量得到的晶面间距表明，镍离子在二氧化铈基体中替代铈离子。在室温下进行的磁化测量显示，Ce(1-x)Ni(x)O2（0.0 ≤ x ≤ 0.10）纳米颗粒具有弱铁磁行为。从磁滞回线计算得到的磁矩随镍掺杂量增加至7%时增大，然后随着进一步掺杂开始减小。
