Morphology control of hexagonal strontium ferrite micro/nano-crystals

Abstract

In this study, controllable morphology evolution of hexagonal strontium ferrite (SrFe12O19) micro/nano-crystals has been demonstrated. Single phase strontium ferrite platelets with hexagonal morphology were successfully prepared by conventional ceramic process. In the hexagonal crystals, it is revealed that the anisotropic growth rate is changed, with the increasing of ball milling time, from relatively high rate along the <00l> direction (c-axis) to <hk0> direction, leading to the morphology evolution. Moreover, the optimal saturation magnetization (MS) is 69.5 emu/g, which is intensely close to the theoretical value (72 emu/g). This study provides the direct evidence of the enhanced reaction activity induced by high energy ball milling in strontium hexaferrite platelets and the obtained SrFe12O19 particles are promising for the hard magnet application and the magnetoelectric electronics.

Physical and Magnetic Characterization of Hard/Soft SrFe₁₂O₁₉/CoFe₂O₄ Nanocomposite Magnets Made by Mechanical Alloying and Ultrasonic Irradiation

“…The X-ray diffraction data curve provides information about the lattice parameter and phase. It can also be used to calculate the microstrain and crystallite size of samples using the Williamson-Hall plot with the equation [21].…”

Investigation of structural, magnetic and dielectric properties of gallium substituted Z-type Sr3Co2-Ga Fe24O41 hexaferrites for microwave absorbers

“…Thus, it is essential to find a suitable technique and temperature for the synthesis of single-domain SrZhexaferrites with a high degree of homogeneity [25]. There are various techniques used for the synthesis of hexaferrites such as ball milling [26], standard ceramic [27,28], microwave hydrothermal [29], co-precipitation [30], micro-emulsion [31] and sol-gel [32,33].…”

The promoted synthesis of minoxidil by magnetic nanoparticles of cobalt ferrite(CoFe2O4) as a heterogeneous reusable catalyst

“…These NPs provide prominent advantages such as simple synthetic procedure, high catalytic activity due to huge surface area to volume ratio [6], chemical reactivity and thermal stability [7,8], easy separation using an external magnetic field without utilizing further traditional filtration process and perfect reusability [9,10]. Moreover, they have received a considerable interest because of their wide useful capabilities in drug delivery, magnetic resonance imaging, and biomedical technology [11][12][13][14][15][16]. It is notable that in pharmaceutical industry, the recovery and complete separation of magnetic nanocatalysts is important, because the presence of residual metals in final products may have dangerous consequences.…”