Kumar Shalendra, Batoo Khalid Mujasam, Gautam S, Koo B H, Chae K H, Chung Hanshik, Lee Chan Gyu
School of Nano and Advanced Materials Engineering, Changwon National University, 9 Sarim dong, Changwon-641-773, Republic of Korea.
J Nanosci Nanotechnol. 2011 Jan;11(1):396-401. doi: 10.1166/jnn.2011.3262.
The structural, magnetic, and electronic structural properties of Ni0.2Cd0.3Fe(2.5-x)Al(x)O4 ferrite nanoparticles were studied via X-ray diffraction (XRD), transmission electron microscopy (TEM), DC magnetization, and near-edge X-ray absorption fine-structure spectroscopy (NEXAFS) measurements. Nanoparticles of Ni0.2Cd0.3Fe(2.5x)Al(x)O4 (0 < or = x < or = 0.4) ferrite were synthesized using the sol-gel method. The XRD and TEM measurements showed that all the samples had a single-phase nature with a cubic structure, and had nanocrystalline behavior. From the XRD and TEM analysis, it was found that the particle size increases with Al doping. The DC magnetization measurements revealed that the blocking temperature increases with increased Al doping. It was observed that the magnetic moment decreases with Al doping, which may be due to the dilution of the sublattice by the doping of the Al ions. The NEXAFS measurements performed at room temperature indicated that Fe exists in a mixed-valence state.
通过X射线衍射（XRD）、透射电子显微镜（TEM）、直流磁化和近边X射线吸收精细结构光谱（NEXAFS）测量，研究了Ni0.2Cd0.3Fe(2.5-x)Al(x)O4铁氧体纳米颗粒的结构、磁性和电子结构性质。采用溶胶-凝胶法合成了Ni0.2Cd0.3Fe(2.5x)Al(x)O4（0≤x≤0.4）铁氧体纳米颗粒。XRD和TEM测量表明，所有样品均具有单相立方结构，并具有纳米晶行为。通过XRD和TEM分析发现，粒径随Al掺杂量的增加而增大。直流磁化测量表明，阻塞温度随Al掺杂量的增加而升高。观察到磁矩随Al掺杂量的增加而减小，这可能是由于Al离子掺杂导致亚晶格稀释所致。室温下进行的NEXAFS测量表明，Fe以混合价态存在。
