Synthesis of Ferromagnetic La1-xSrxMnO3 Nanoparticles by Precipitation in the Reversed Microemulsions

摘要

Ferromagnetic La1-xSrxMnO3 nanoparticles were synthesized by precipitation in the reversed microemulsions based on different surfactants. It was shown that an amorphous precursor formed during the synthesis process and further heat treatment was necessary to obtain the crystalline nanoparticles. It was established that obtained nanoparticles were weakly agglomerated with particles sizes 20 – 30 nm. Sizes of nanoparticles depended on the type of the surfactant. Based on the synthesized nanoparticles magnetic fluids were prepared, their heating efficiency under the action of an alternating magnetic field was studied and corresponding values of the specific loss power were calculated. It was established the efficiency of heating nanoparticles under the alternating magnetic field dependently on the particle’s morphology and their magnetization