Ni–Zn–Sm nanopowder ferrites: Morphological aspects and magnetic properties

Costa, Ana Cristina Figueiredo de Melo; Diniz, Ana Paula; Melo, A.G.B. de; Kiminami, R. H. G. A.; Cornejo, D.R.; Costa, Antônio Albuquerque da; Gama, L.

doi:10.1016/j.jmmm.2007.08.011

Cited by 72 publications

(17 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Solubility limit of RE 3+ ions is enhanced in chemically synthesized RE ferrites. Presence of secondary phases after certain concentration of RE 3+ ions is observed in Mn0.5Zn0.5RE0.05Fe1.95O4 (where RE = Tb, La, Ce and Th) [45] and Ni0.5Zn0.5Fe2−xSmxO4 (x=0.0, 0.05, and 0.1) when synthesized using combustion method [46]. Sol-gel synthesis of CoFe2-xRExO4 (RE: Ho, Er, Tm, Yb, Lu) ferrite nanocrystalline films leads to presence of spinel phase with slightly enlarged cell constants and impure phase appear after RE ions concentration of 0.2 [47], however, Eu-doped ZnFe2O4 nanoparticles synthesized using same method exhibit onset of impure phase for concentration of 0.03 [48].…”

Section: Review Articlementioning

confidence: 96%

Solubility limit, magnetic interaction and conduction mechanism in rare earth doped spinel ferrite

Singh¹,

Kumar²,

Srivastava³

et al. 2016

Appl. Sci. Lett.

View full text Add to dashboard Cite

In present review we have focused various issues like solubility limit, magnetic interaction and conduction mechanism of rare earth doped ferrite. Cumulative effects of valence state, magnetic moments of rare earth ions, weakening/strengthening of exchange interaction and magnetic ordering in rare earth ion doped ferrite are responsible for magnetic behavior. It is proposed that characterization techniques based on synchrotron radiation like X-ray absorption spectroscopy and X-ray magnetic circular dichroism can open pathways to prove these assumptions.Keywords: Rare earth, ferrites, magnetic interaction, valence state 1.INTRODUCTIONSpinel ferrites are ferrimagnetic material which have numerous technological applications [1][2][3]. Moreover, nanoparticles of these ferrites are being utilized in high-density magnetic information storage, magnetic resonance imaging, drug delivery etc. [4][5][6]. These several applications are based on magnetic and electrical behavior of ferrites [1][2][3][4][5][6]. These properties depend on various factors like, ionic radii, nature of hybridization, presence of doped atom in host lattice apart from the particle size [7][8][9][10]. Thus, research is being carried out for doped ferrite systems in order to understand the altered behavior and to optimize them for different applications [11][12][13][14][15]. In recent years, rare earth (RE) doped ferrites become interesting due to their superiority for various applications over other doped ferrite systems [17][18][19][20][21][22]. These systems become radioactive and exhibit potentential for biomedical applications [19] along-with efficient tumor passive targeting [23]. Improved capability of dye removal [24], waste water treatment [25], degradation of organic pollutants through photocatalytic activity [26] are other important fields of utilization of these ferrites. These ferrites exhibit enhanced magneto optical kerr (MOKE) effect [20] and excellent microwave absorption properties [21,22]. Thus, these ferrites cover a wide range of applications chiefly based on their magnetic characteristics [17][18][19][20][21][22][23][24][25]. However, there is lack of understanding of magnetic interaction, conduction mechanism inside these ferrites [15,16]. Thus purpose of this review article is to discuss these issues and to give prospects for future research in this direction. SPINEL FERRITEThe general formula for spinel ferrite is MO:Fe2O3 where, M is a divalent transition metal ion. Spinel name is given due to resemblance of structure of these ferrites with mineral spinel MgO.Al2O3. In this structure, oxygen ions are packed quite close together in face centred cubic arrangement and metal ions occupy spaces between them (Fig. 1). These spaces are categorized as tetrahedral (A) and octahedral (B) sites when surrounded by four and six oxygen ions respectively (Fig. 1).In a unit cell of spinel ferrite, there exists 64 and 32 A and B-sites respectively. Only 1/8 th and 1/2 th of A and B-sites are occupied [27]. Metal ions are distributed among A a...

show abstract

Section: Review Articlementioning

confidence: 96%

Solubility limit, magnetic interaction and conduction mechanism in rare earth doped spinel ferrite

Singh¹,

Kumar²,

Srivastava³

et al. 2016

Appl. Sci. Lett.

View full text Add to dashboard Cite

show abstract

“…Until now, many investigations have been carried out to make further improvements on the magnetic and dielectrical properties of rare earth substituted ferrites [7][8][9][10][11][12]. Rezlescu et al [12] pointed out that rare earth ions could drastically affect the physical properties of substituted ferrites due to their larger ionic radius, and when the doping contents of rare earth ions were relatively low, the rare earth ions could enter into the octahedral sites (B-sublattice) of Ni-Zn ferrites, and replace Fe 3 þ ions in the lattice.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pr3+ doping on magnetic and dielectric properties of Ni–Zn ferrites by “one-step synthesis”

Peng

et al. 2011

Journal of Magnetism and Magnetic Materials

166

View full text Add to dashboard Cite

“…In contrast with the whole samarium doped rare earth elements, the five samples we get are relatively pure, there is not much impurity generation. From this figure, it is easy to see that when samarium [9][10][11][12] is very low doping (x <0.05), the samples are mainly spinel ferrite. When x = 0.1, the phase appears in the second doping [13][14][15] SmFeO 3 , particularly with the increase in the amount of doping, when x = 0.2, the diffraction peak of the impurity phase is particularly evident.To better illustrate the movement of the characteristic peaks' angle ,we did a simple processing.…”

Section: Characterizationsmentioning

confidence: 93%

Structural and magnetic properties of Ni0.5Zn0.5SmxFe2-xO4 nanoferrite by sol-gel auto-combustion method

Yuan¹,

Song²,

Du³

et al. 2016

Proceedings of the 2016 6th International Conference on Advanced Design and Manufacturing Engineering (ICADME 2016)

View full text Add to dashboard Cite

Keywords: Structural and magnetic properties,sol-gel auto-combustion method, Ni 0.5 Zn 0.5 Sm x Fe 2-x O 4 nanoferrite Abstract. Samarium ion substituted magnesium of Ni 0.5 Zn 0.5 Sm x Fe 2-x O 4 spinel ferrite powders have been prepared by a sol-gel auto-combustion method. XRD results indicate that the production of a single cubic phase of ferrites. Some particles are agglomerated due to the presence of magnetic interactions among particles. The Mössbauer spectra of Ni 0.5 Zn 0.5 Sm x Fe 2-x O 4 nanocrystalline at room temperature show that the magnetic interaction and interface atomic state were influenced strongly by Sm 3+ ratio, and the saturation magnetization of a spinel ferrite largely also depends on Sm 3+ ratio and particle size, while the coercive field depends on Sm 3+ ratio, particle size and their shapes. The SEM micrographs indicate that the Nanocrystalline Particles' specific features and characteristics.

show abstract

Ni–Zn–Sm nanopowder ferrites: Morphological aspects and magnetic properties

Cited by 72 publications

References 24 publications

Solubility limit, magnetic interaction and conduction mechanism in rare earth doped spinel ferrite

Solubility limit, magnetic interaction and conduction mechanism in rare earth doped spinel ferrite

Effect of Pr3+ doping on magnetic and dielectric properties of Ni–Zn ferrites by “one-step synthesis”

Structural and magnetic properties of Ni0.5Zn0.5SmxFe2-xO4 nanoferrite by sol-gel auto-combustion method

Contact Info

Product

Resources

About