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In this study, the microstructural, optical, and magnetic properties and specific absorption rate (SAR) of bismuth ferrite/SiO 2 nanoparticles were successfully investigated. The coprecipitation method was used to synthesize the nanoparticles. X-ray diffraction patterns showed the presence of sillenite-type Bi 25 FeO 40 with a body-centered cubic structure. The crystallite size of Bi 25 FeO 40 was 35.0 nm, which increased to 41.5 nm after SiO 2 encapsulation. Transmission electron microscopy images confirmed that all samples were polycrystalline. The presence of Si–O–Si (siloxane) stretching at 1089 cm− 1 in Fourier transform infrared spectra confirmed the encapsulation of SiO 2. Magnetic measurements at room temperature indicated weak ferromagnetic properties of the samples. The coercivity of the bismuth ferrite nanoparticles was 78 Oe, which increased after SiO 2 encapsulation. In contrast, their maximum …