Structural and magnetic properties of nanoparticle Mn-Zn-Ni ferrite powders grown by using a sol-gel method

Nickel Substitution Effects on Nano-sized Co, Mn and MnZn Ferrites Synthesized by Sol-gel Method

“…The XRD and SEM results show that the particles increased in size with nickel ion substitution, and this could have led to an increase in the saturation magnetization and coercivity. Similar reports have been presented for Co 0.5 Mn 0.5 Fe 2 O 4 nanoparticles [18], and in Mn 1-2x Zn x Ni x Fe 2 O 4 ferrite powders the coercivity decreased from 79.2 Oe (x = 0.0) to 64.2 Oe (x = 0.1) as the zinc and nickel substitution increased, and this could be related to the increase in the particle size [14,15]. The superparamagnetic phase resulting from the smaller particle size changed to a ferrimagnetic phase at x = 0.1, as confirmed by the Mössbauer spectra.…”

“…However, the spectra of the x = 0.1 sample is fitted with two sextets and one doublet. The area ratio of the doublet decreased some as Zn and Ni substitution increased [15]. The Mössbauer absorption spectra can be explained to be a result of the variation in the magnetic phase resulting due to the particle sizes.…”

“…The Mössbauer absorption spectra can be explained to be a result of the variation in the magnetic phase resulting due to the particle sizes. As shown for Mn 1-2x Zn x Ni x Fe 2 O 4 ferrite powders [10,15], the Mössbauer spectra for the x = 0.0 sample annealed at 523 K and the x = 0.1 sample annealed at 473 K are attributed to paramagnetic behavior. This originates from the small particle size, and the superparamagnetic properties were confirmed by the low-temperature Mössbauer spectra.…”

“…The spectra of Co 1-x Ni x Fe 2 O 4 and Mn 1-x Ni x Fe 2 O 4 are fitted with two six-line subspectra, and these are assigned to a tetrahedral A site and octahedral B sites of a typical spinel crystal structure. As shown in Table 2, the values of the quadruple splitting (QS) and isomer shift (IS) of A and B sites are small changed with nickel substitution, while those of the magnetic hyperfine fields (H hf ) are increased some in the A and B sites [11,12,15]. The increase in the values of the magnetic hyperfine fields indicates that the superexchange interaction is stronger with the nickel substitution in Co 1-x Ni x Fe 2 O 4 and Mn 1-x Ni x Fe 2 O 4 , which can be explained by using the cation distribution.…”

Crystallographic and Magnetic Properties of Co, Zn, Ni-Zn Substituted Nano-size Manganese Ferrites Synthesized by Sol-gel Method

“…Therefore, the results of this work do not support this explanation. However, the XRD and SEM As a result of these two effects, the saturation magnetization decreases slightly with Ni and Zn substitution [19], and the coercivity (105.8 Oe) of the Mn 0.8 Ni 0.1 Zn 0.1 Fe 2 O 4 ferrite powder is smaller than that of pure MnFe 2 O 4 , which could also be related to the particle size [17,19]. The superparamagnetic phase resulting from the smaller particle size changed to a ferrimagnetic phase, as confirmed by the Mössbauer spectra.…”