Spivakov Aleksandr A, Lin Chun-Rong, Lin En-Szu, Chen Ying-Zhen, Tseng Yaw-Teng
Department of Applied Physics, National Pingtung University, No. 1 Linsen Rd., Pingtung City, 900393, Taiwan.
Nanoscale Res Lett. 2021 Nov 4;16(1):162. doi: 10.1186/s11671-021-03619-7.
Mixed-metal oxide nanoparticles have attracted great scientific interest since they find applications in many fields. However, the synthesis of size-controlled and composition-tuned mixed-metal oxide nanoparticles is a great challenge that complicates their study for practical application. In this study, Co-doped FeMnO nanoparticles were synthesized by the solvothermal method in which the crystallization was carried out under autogenous pressure at temperatures of 190 °C for 24 h. The influence of Co doping on the evolution of the structural and magnetic properties was investigated by various methods. It was found from XRD data that crystallite size decreases from 9.1 to 4.4 nm with the increase in Co content, which is in good agreement with the results of TEM. Based on the results of magnetic measurements, it was found that the saturation magnetization first increases with an increase in the cobalt content and reaches its maximum value at x = 0.4, and a further increase in x leads to a decrease in the saturation magnetization. The influence of cation redistribution on the observed changes has been discussed.
混合金属氧化物纳米颗粒因其在许多领域的应用而引起了极大的科学兴趣。然而，合成尺寸可控且成分可调的混合金属氧化物纳米颗粒是一项巨大的挑战，这使得它们在实际应用中的研究变得复杂。在本研究中，通过溶剂热法合成了钴掺杂的FeMnO纳米颗粒，其中结晶过程在190℃的自生压力下进行24小时。采用多种方法研究了钴掺杂对结构和磁性演变的影响。从XRD数据发现，随着钴含量的增加，微晶尺寸从9.1nm减小到4.4nm，这与TEM结果吻合良好。基于磁性测量结果，发现饱和磁化强度首先随着钴含量的增加而增加，并在x = 0.4时达到最大值，x的进一步增加导致饱和磁化强度降低。讨论了阳离子再分布对观察到的变化的影响。
