Spivakov Aleksandr A, Lin Chun-Rong, Chang Yu-Chuan, Chen Ying-Zhen
Department of Applied Physics, National Pingtung University, Pingtung County 90003, Taiwan.
Nanomaterials (Basel). 2021 May 30;11(6):1447. doi: 10.3390/nano11061447.
Pyrrhotite nanoparticles with 5C and 3C superstructures were synthesized via a simple one-step thermal decomposition method in which hexadecylamine was used as a solvent at various reaction temperatures (T). Structural analysis showed that at T = 360 °C, almost uniform in size and shape FeS nanoparticles with 3C superstructure are formed, and an increase in the reaction temperature leads to the formation of FeS nanoparticles (5C superstructure), herewith a significant increase in the size of nanoparticles is observed. High-temperature magnetic measurements in 5 repeated heating-cooling cycles revealed that after the first heating branch in the FeS samples, the λ-Peak transition disappears, and the magnetization has a Weiss-type behavior characteristic of the FeS sample. The change in the behavior of magnetization can be explained by the redistribution of iron vacancies, which changes the initial phase composition of nanoparticles.
通过一种简单的一步热分解方法合成了具有5C和3C超结构的磁黄铁矿纳米颗粒，其中在不同反应温度（T）下使用十六胺作为溶剂。结构分析表明，在T = 360°C时，形成了尺寸和形状几乎均匀的具有3C超结构的FeS纳米颗粒，反应温度的升高导致形成FeS纳米颗粒（5C超结构），同时观察到纳米颗粒尺寸显著增加。在5个重复的加热-冷却循环中的高温磁性测量表明，在FeS样品的第一个加热分支之后，λ峰转变消失，并且磁化具有FeS样品特有的魏斯型行为特征。磁化行为的变化可以通过铁空位的重新分布来解释，这改变了纳米颗粒的初始相组成。
