Transmission electron microscopy

Nanoparticle

Metallurgy

Materials science

Chromatography

Substitution (logic)

Computer science

Magnetic susceptibility

Physics

Nanotechnology

Crystallite

Magnetic hyperthermia

Optics

Condensed matter physics

Composite material

Analytical Chemistry (journal)

Nanomaterials

Crystallography

Chemistry

Programming language

Scanning electron microscope

Diffraction

Magnetic nanoparticles

Journal of Magnetism and Magnetic Materials

In this study, nano-sized particles of BaCrxFe12−xO19 (0.0 ≤ x ≤ 1.0) hexaferrite were fabricated through citrate auto gel combustion process and the impact of Cr-ion substitution on ac magnetic susceptibility properties of Ba-hexaferrite were explored. X-ray powder diffraction (XRD) measurements approved the purity of prepared samples and showed a reduction of the average crystallite size with increasing the content of Cr. Transmission electron microscopy (TEM) observation indicated the hexagonal morphology of all samples. AC susceptibility measurements displayed a frequency dependence of the magnetic responses. These measurements indicated that there are strong magnetic interactions (which is the highest for BaCr0.3Fe11.7O19 NP) between particles which cause a superspin glass-like (SSG) behavior at low temperatures. Estimating the values of loss power density revealed an increase of loss power density with increasing Cr-substitution element. The relative sensitivity of the prepared MNPs to the variation of applied frequency is very influenced by Cr-substitution and is highest in BaCr0.3Fe11.7O19 MNPs, suggesting that this sample can be considered as magnetic nanomaterial for hyperthermia and for many other applications.

Effect of Cr 3+ substitution on AC susceptibility of Ba hexaferrite nanoparticles