Формирование структуры и магнитных свойств коллоидных наночастиц феррита марганца в зависимости от длительности микроволнового гидротермального in situ синтеза

Abstract

This work reports a one-step ultrafast in-situ microwave hydrothermal (MAH) synthesis of soft magnetic colloidal nanoparticles using citric acid (CA). The chelation of CA with lattice metal ions led to the formation of a stable colloid based on 100 % pure MFO spinel NPs with a size of 32±10 nm and very soft magnetic properties, formed as a result of the MAH synthesis at a temperature of 175 °C and a duration of 30 minutes. Observably, the increase in the MAH synthesis duration from 30 minutes to 3 hours resulted in a decrease in the phase purity of CA-functionalized MFO NPs from 100 % to 52 % and the saturation magnetization from 43.4±0.7 to 33.9±2.0 emu/g owing to the increased CA degradation