XRD, EDX, FTIR and ESR spectroscopic studies of co-precipitated Mn–substituted Zn–ferrite nanoparticles

Effect of Silica Embedding on the Structure, Morphology and Magnetic Behavior of (Zn0.6Mn0.4Fe2O4)δ/(SiO2)(100−δ) Nanoparticles

“…The bulk density of the samples, as well as the grain sizes also can have an important effect on the magnetic behavior of the samples. The release of tension by the bigger grains is higher than by the smaller grains leading to lattice expansion [29]. The With increasing calcination temperature, the NPs have a softer magnetic behavior since higher magnetic field are needed to fully saturate the magnetization of the samples [28].…”

Synthesis and characterization of ultrasmall MgFe2O4 nanoparticles down to the quantum dot scale

“…The region around 400 cm -1 is related to the intrinsic stretching vibration of the transition metals ions in the octahedral B-sites. The other region around 500 cm -1 is related to the intrinsic stretching vibration of the transition metals ions in the tetrahedral A-sites [22]. Higher energy is needed for the bond (Fe -O) stretching vibration mode occupying the tetrahedral site than that octahedral site, as the bond length at A-site is shorter than B-site [23].…”

The structure, and magnetic properties of NiR0.05Fe1.95O4 (rare earth R=Sm, Gd): Effect of Thermal Neutron Radiation

“…The observed increase of U cannot be related to the decreased lattice parameter a. The decrease of a (from the XRD measurements) will decrease interatomic spacing and lead to shortening of bond lengths, hence the U would decrease [32]. However, the decreased values of the lattice energy with increasing the exposure dose can be attributed to the increase of the elastic parameters and the enhanced particle size [25,32].…”

“…Where a is the lattice constant obtained from the XRD measurements. Different elastic parameters can be calculated as [27][28][29][30][31][32]:…”

“…The decrease of a (from the XRD measurements) will decrease interatomic spacing and lead to shortening of bond lengths, hence the U would decrease [32]. However, the decreased values of the lattice energy with increasing the exposure dose can be attributed to the increase of the elastic parameters and the enhanced particle size [25,32]. As mentioned before, the NiFe1.95Gd0.05O4 compound is more sensitive to thermal neutron exposure than the NiFe1.95Sm0.05O4 compound, which is reflected in the changes in the elastic properties of the two compounds.…”