What is the difference between maghemite and magnetite

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Issue 8, From the journal: RSC Advances. Ibrahim Dar ab and S. You have access to this article. Please wait while we load your content Something went wrong. Try again? Cited by. Download options Please wait Additional contributions from copper, carbon, and silicon are from the TEM grid used during imaging. In addition to the aggregation of particles observed in TEM images, the qualitative elemental maps illustrate the distribution of these elements across the specimen.

Figure 3 b, c shows the homogeneous spread, at a nanometer scale, of iron and oxygen throughout the sample. The graph of magnetization of the sample at several applied magnetic fields for iron oxide nanoparticles is presented in Fig. Hysteresis measurements conducted at different increments of the applied field, to ensure reliability of the obtained results, do not show significant deviation from each other.

The value of saturation magnetization decreases when particles are reduced in size because of several factors. Primarily, the saturation magnetization for particles below 10 nm in size is lowered because of the spin canting effect. However, these single-domain magnetic nanoparticles are ideal for superparamagnetic behavior at room temperature.

However, a detailed inspection reveals that the spectrum is best fitted with three sub-spectra. The intensity ratio of the first two sub-spectra is close to This is in accordance with the intensity ratio in magnetite. The slightly different hyperfine values and intensity of the first sub-spectrum compared to the A-site in magnetite are due to strong overlapping of this sub-spectrum with the third component, which is attributed to maghemite.

Costa et al. Our attempt to lock down the parameters to the reported literature values resulted into hyperfine parameters which are not physically acceptable for magnetite and maghemite. On a similar note, the fitting attempt without locking the parameters resulted in an incorrect intensity distribution and was discarded. This allows for an unconstrained variation in the parameters, resulting in the correct intensity distribution over the physically accepted values of hyperfine constants.

The sub-spectra are also indicated. In summary, we have analyzed the structural and magnetic properties to determine the contributions from magnetite and maghemite in iron oxide nanoparticles. X-ray diffraction and high-resolution TEM imaging enabled us to determine the crystallinity, particle size, and lattice parameter of the nanoparticles. The nanoparticles demonstrated the single-domain magnetic properties with near-zero coercivity and negligible remanence magnetic field.

The understanding of the composition of magnetite and maghemite in iron oxide nanoparticles is necessary to isolate particles with desired magnetic properties for biomedical or nanotechnological applications.

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