Magnetic study on Co3O4 nanoparticles

Magnetization measurements for the Co3O4 nanoparticles were performed. From the X-ray diffraction patterns Co3O4 nanoparticles surrounded by amorphous SiO2 were expected for the samples annealed between 623 and 873 K. Their diameters were estimated to be 2 or 3 nm. DC magnetization curves of zero-field cooled and field-cooled bifurcated around T-t = 10 K, while the bulk Co3O4 crystal exhibits antiferromagnetic transition temperature at T-N = 33 K. Characteristic properties of extremely small Co3O4 nanoparticles were confirmed. (C) 2003 Elsevier B.V. All rights reserved.

对四氧化三钴纳米颗粒进行了磁化测量。从X射线衍射图谱来看，对于在623至873K之间退火的样品，预计会有被无定形二氧化硅包围的四氧化三钴纳米颗粒。它们的直径估计为2或3纳米。零场冷却和场冷却的直流磁化曲线在\(T_t = 10K\)左右出现分叉，而块状四氧化三钴晶体在\(T_N = 33K\)时呈现反铁磁转变温度。极小的四氧化三钴纳米颗粒的特性得到了证实。（C）2003爱思唯尔有限公司。保留所有权利。