Induced Size Effects Of Gd3+ ions Doping On Structural And Magnetic Properties Of Ni-Zn Ferrite Nanoparticles

Abstract

Gd3+ ions substituted in Ni 0.5 Zn 0.5 Gd x Fe 2-x O 4 (where x = 0.1, 0.2, 0.3) ferrite nanoparticles in the size range from 15 to 25 nm were prepared by chemical method. The effect of Gd 3+ ions in spinel structure in correlation to structural and magnetic properties have been studied in detail using XRD, HRTEM and EPR techniques. The spin resonance confirms the ferromagnetic behaviour of these nanoparticles and higher order of dipolar-dipolar interaction. On increasing Gd 3+ ions concentrations, the super exchange interaction i.e. increase in movement of electron among Gd 3+ -O -Fe 3+ in the core group and the spin biasing in the glass layer has been interpreted. The decrease in 'g' value and increase in relaxation time is well correlated with the change of particle size on different concentrations of Gd 3+ ions in Ni-Zn ferrite.

Structural and Magnetic Properties of NiZn Ferrite Nanoparticles Synthesized by a Thermal Decomposition Method

“…NiZn ferrite nanoparticles are becoming more and more important in the field of bio-medical applications for instance magnetic resonance imaging (MRI), drug delivery systems and hyperthermia treatment of cancer by using their appropriate magnetic properties, antimicrobial activity and biological compatibility [8,9]. Figure 1 shows the spinel structure (the lattice parameter is about 0.84 nm) is formed by 24 cations (Fe 2+ , Zn 2+ , Co 2+ , Mn 2+ , Ni 2+ , Mg 2+ , Fe 2+ , Gd 2+ ) and 32 O 2− anions and generally has a chemical form of AB 2 O 4 , which is designated as a cubic closed-packing of O 2− ions [10][11][12][13]. The round and the square brackets represent the tetrahedral interstitial A site and the larger octahedral interstitial B site, respectively.…”

“…Sci. 2020, 10, x FOR PEER REVIEW 2 of 11 form of AB2O4, which is designated as a cubic closed-packing of O 2− ions [10][11][12][13]. The round and the square brackets represent the tetrahedral interstitial A site and the larger octahedral interstitial B site, respectively.…”

Influence of Yb3+ on the structural, electrical and optical properties of sol–gel synthesized Ni-Zn nanoferrites

“…substituted Ho 3+ with Ni-Zn ferrite synthesized using the conventional ceramic method with the composition of Ni 0.7 Zn 0.3 Ho 2x Fe 2-2x O 4 [18] and studied both electrical and magnetic properties. Beside various elements are substituted in the Ni-Zn ferrites system such as Gd [19], Tb [1], La, Yb, Dy, Ce [15], Nd [20], Gd, Nd, Yb, Lu [21], Y, Eu, Gd [22], Er [23], Y [14], Sm [24], Pr [25].…”

Effects of Ni Concentration on the Structural and Magnetic Properties of NiZnFe₂O₄ Ferrites Synthesized via a Polymer Precursor

“…Besides cationic distribution, grain size and porosity play vital roles in determining the characteristics of these ferrites [3]. Nanostructured ferrites have drawn recent attention due to their novel electrical and magnetic properties, which make them apposite for many technological applications, ranging from microelectronics and storage devices to drug delivery, medical diagnostics and biomedical imaging [8][9][10].…”