Nanoscale Clustering and Magnetic Properties of Mn x Fe3−x O4 Particles Prepared from Natural Magnetite

Abstract

A series of Mn x Fe 3−x O 4 (0 ≤ x ≤ 1) nanoparticles was successfully synthesized via a simple coprecipitation method. The starting material was a natural magnetite purified from local iron sand. Crystallite nanoparticles were produced by drying without using a high calcination temperature. Rietveld analysis of the X-ray diffractometry (XRD) data for all samples demonstrated that the Mn ions partially substituted the Fe ions in the spinel cubic structure of the Fe 3 O 4 to form Mn x Fe 3−x O 4 phases. We applied two lognormal spherical and single mass fractal models to the analysis of the small-angle neutron scattering (SANS) data and revealed that the primary Mn x Fe 3−x O 4 particles ranged in size from 1.5 to 3.8 nm and formed three-dimensional Darminto

Optical Properties of Fe3O4Magnetic Fluid from Iron Sand

“…The lattice parameters and crystal volume were respectively a = b = c = 8.368 Å and V = a × b × c = 585.97 Å 3 . These results are similar to the crystal parameters of the Fe 3 O 4 nanoparticles preparing from iron sand by other synthesis method [13]. Furthermore, the particle size of the Fe 3 O 4 particle was approximately 9 nm after determined by using a Debye Scherer's formula.…”

“…The purified Fe 3 O 4 powders as a main precursor was selected from natural iron sand following our previous works [13][14][15][16][17]. However, in this work, the synthesis method was developed by combining the coprecipitation as reported in our previous works with the sonochemical route using ultrasonic bath at a frequency of 40 KHz at room temperature for 1 hour.…”

Synthesis of Magnetite (Fe 3 O 4 ) Nanoparticles from Iron sands by Co - precipitation - U ltrasonic Irradiation Methods

“…The solution is then filtered and slowly etched with NaOH while being heated to a temperature of 70°C to obtain black precipitate. The detail of synthesizing Fe 3 O 4 particles from iron sands using the coprecipation method is adapted from our previous work [31,32]. Moreover, the Fe 3 O 4 synthesized by ultrasonic irradiation follows the same procedure as the previous method, except that ultrasonic waves irradiation (Phywe Generator, 200 KHz/10 W) was used while dropping the NaOH into the solution for two hours to obtain a black precipitate.…”

Spinel‐Structured Nanoparticles for Magnetic and Mechanical Applications

“…The detail of synthesis method for the preparation of Fe 3 O 4 nanoparticles was described in our previous works [53][54][55][56][57]. The iron sand was extracted by a magnetic separator to obtain dominantly Fe 3 O 4 powders.…”