Elaboration, Characterization, and Magnetic Properties of Ni_0.5Zn_0.5Fe₂O₄ Nanoparticles of High Purity Using Molten Salts Technique

Abstract

Ferrite nanoparticles of basic composition Ni 0.5 Zn 0.5 Fe 2 O 4 are synthesized for the first time through molten salt method using Fe 1.61 O 3 , Ni 0.47 (OH) 2 , and Zn 0.98 O as non-standard Moroccan raw materials. The effect of various parameters such as annealing temperature and time on crystalline structure of Ni-Zn ferrite has been investigated. The TGA analysis shows the thermal behavior of the reagents mixture. The X-ray diffraction pattern confirmed the single phase, high crystalline and cubic structure with Fd3m space group, and average crystallite size of 29 nm. The Fourier transform infrared spectra (FT-IR) shows two fundamental absorption bands (v 1 and v 2 ) that are attributed to the stretching vibration of tetrahedral and octahedral sites, observed in spinel structure, in the wave number range of 400-600 cm À1 . Particle size are evaluated by using transmission electron microscopy and proved that they have a cubical shape. EDS result confirms the purity of the Ni-Zn nanoferrite powder. Magnetic measurements reveal a weak ferrimagnetic behavior at low temperature and superparamagnetism at high temperature.

Recent Developments on Molten Salt Synthesis of Inorganic Nanomaterials: A Review

“…Ferrites are important spinels. ,− Other than TMSS, AMSS is another addition to the MSS. AMSS leads to crystal nucleation and growth, especially those with well-defined facets and commonly seen in nature, by removing volatile component or aerosol droplet cooling .…”

New Nanosized (Gd3+, Sm3+) Co-doped Zinc Ferrite for Telecommunication Applications. Magnetic and Structural Properties.

“…The Magnetic Property Measurement System (MPMS), was used to study the magnetic properties of sample, the figure.6 shows the magnetic measurement of the hysteresis cycle at temperature 5k , 80k and 300k , under the external field applied ∓50 kOe. The pronounced, which proves a transition to a ferrimagnetic behavior, which originates from the cationic distribution, generated by the occupation of specific sites and the distribution between octahedral and tetrahedral sites and also from the particle size [44]. The increase of H c at 5 K can be interpreted also by the non-compensation of exchange interactions between the three sub-lattices that make up the structure, and therefore the rotational magnetization mechanism is present.…”

The first structural, morphological and magnetic property studies on spinel nickel cobaltite nanoparticles synthesized from non-standard reagents

“…[37][38][39][40][41] The second weight loss (B5%) takes place between 220 and 350 1C, due to the CO 2 emission caused by the decomposition of cobalt carbonate to Co 3 O 4 (eqn (1)), and the dehydroxylation reaction of nickel hydroxide to produce the nickel oxide NiO (eqn (2)). 9,39,42 The third weight loss (B28%) occurs above 750 1C, which is attributed to melting of the salt, reduction of Co 3 O 4 to CoO (eqn (3)) and total decomposition of the NiCo 2 O 4 material resulting in the emergence of NiO. 39,42 From these thermal results, the decomposition and dehydroxylation of the reagents favor the formation of the spinel phase of nickel cobaltite (eqn (4)) in the temperature range from 250 and 350 1C, and this is confirmed from the DTG curve by the presence of the exothermic peak in the temperature region 280 1C.…”

“…[3][4][5][6][7] The spinel nanomaterials exhibit a formula of A x B 3Àx O 4 in the cubic spinel structure, in which A and B represent the tetrahedral and octahedral distributions of cations, where A and B are transition metals such as Ni, Zn, Co, Fe, Mn, etc. [8][9][10][11] This spinel structure allows various interesting physicochemical properties due to the different oxidation states of the transition metals and their distribution in the tetrahedral and octahedral sites. Moreover, the electron transfer process is made possible by the partially filled 3d transition metal orbitals, which play a key role in creating or increasing excellent electronic, magnetic and electrochemical properties.…”