Microwave-assisted synthesis and magnetic properties of M-SrFe12O19 nanoparticles

摘要: Hard magnetic materials a b s t r c Strontium hexaferrite nanoparticles were synthesized by microwave-assisted hydrothermal process. The variation of structure, morphology and properties the as-produced particles after annealing temperatures carefully analysed. Pure M-SrFe 12 O 19 powders at T = 200 °C using heating rate 25 °C.min A1. exhibited coercivity 95 kA.m A1 (m 0 Hc 0.12 T), explained shape that crystallized as very thin platelets with micrometer size diameter high aspect ratio in which competition between magnetocrystalline anisotropy takes place. was strongly enhanced 360 0.445 T) optimum temperature 1000 °C. In order to optimize particle annealing, microwave synthesis increased. At 40 range 20–100 nm. powder mixture ferrihydrite. After °C, small amount hematite (<15%) obtained. reach value 465 0.585 T).