Pseudo-superparamagnetic behaviour of barium hexaferrite particles

The effect of hexadecyltrimethylammonium bromide (CTAB) addition on the crystal structure, morphology, and magnetic properties of co-precipitated hexagonal barium ferrite was investigated. For a fixed amount of surfactant, different Fe 3+ concentrations and Fe 3+ /Ba 2+ ratios were used to optimize...

Full description

Saved in:
Bibliographic Details
Published in:RSC advances 2020-05, Vol.1 (32), p.18784-18796
Main Authors: Dudziak, Szymon, Ry y ska, Zuzanna, Bielan, Zuzanna, Ryl, Jacek, Klimczuk, Tomasz, Zieli ska-Jurek, Anna
Format: Article
Language:English
Subjects:
Barium
Barium compounds
Barium hexaferrite
Cetyltrimethylammonium bromide
Chemical precipitation
Chemistry
Coercivity
Crystal structure
Curve fitting
Hysteresis loops
Magnetic properties
Magnetism
Magnetization
Morphology
Size reduction
Surfactants
Unit cell
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The effect of hexadecyltrimethylammonium bromide (CTAB) addition on the crystal structure, morphology, and magnetic properties of co-precipitated hexagonal barium ferrite was investigated. For a fixed amount of surfactant, different Fe 3+ concentrations and Fe 3+ /Ba 2+ ratios were used to optimize the formation of single-phase barium ferrite particles. The results indicated that the obtained ferrite particles exhibited coercivity changes similar to those of superparamagnetic particles with larger than theoretically calculated particle sizes. This results from the softening of the material due to the size reduction of the grains and incorporation of excess barium, localized on the surface of the particles. Therefore, lowering the energy barrier required to reverse the magnetization was observed, while high magnetization saturation was preserved. The precipitation of barium ferrite particles from a surfactant-rich solution allowed control of BaFe 12 O 19 magnetic properties without introducing any modifications inside the crystal structure. Observed morphology evolution of BaFe 12 O 19 ferrite particles, obtained with different relative amounts of surfactant used.
ISSN:2046-2069
2046-2069
DOI:10.1039/d0ra01619e