Dysprosium doping induced shape and magnetic anisotropy of Fe3−Dy O4 (x=0.01–0.1) nanoparticles

Jain, Richa; Luthra, Vandna; Gokhale, Shubha

doi:10.1016/j.jmmm.2016.04.069

Cited by 26 publications

(10 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Generally, Coercivity depends on strain, presence of nonmagnetic atom, particle size, anisotropy and defects. The observe values of H c increases in Ni-Cd ferrite by dysprosium contents due to an increase in magneto-crystalline anisotropy which arises due to coupling of the spin of Fe 3+ with that of Dy 3+ [42]. The low coercive value (< 100 Oe) makes these materials suitable for high frequency applications and as core materials [43,44].…”

Section: Ftir Analysismentioning

confidence: 99%

WITHDRAWN: Influence of trivalent rare earth (Dy3+) ions substitution on the structural, magnetic and dielectric properties of nanosized Ni0.6Cd0.4DyxFe2‒xO4 ferrites

Dubey

Lahiri

2020

Preprint

View full text Add to dashboard Cite

In the present work, Ni0.6Cd0.4DyxFe2‒xO4 (x = 0.0, 0.05, 0.10, 0.15 and 0.20) nanoparticles (NPs) were synthesized by using sol-gel auto combustion method. The structural characterization was performed by XRD, FTIR, SEM, TEM and EDS analyses. XRD patterns confirmed that the pure and dysprosium substituted Ni-Cd ferrites are in single phase spinel structures, while a trace of DyFeO3 appears as a minor phase for higher concentrations (x = 0.10, 0.15 and 0.20). The Debye‒Scherrer’s method and Williamson-Hall (W-H) method were used to evaluate the crystallite sizes and lattice strain. The average crystallite size was found to be in the range from 27 to 48 nm. FT-IR confirms the formation of spinel structure. SEM images show that reduction of grain size with Dy3+ content. Elemental composition features of samples were examined by EDS. The average particles size estimated from TEM analysis are in good agreement with results obtained from the XRD. The results showed that saturation magnetization (Ms) decreases and coercivity (Hc) increases with increase in Dy3+ concentrations. The dielectric constant and the loss tangent decrease rapidly with increasing frequency and then reaches a constant value, characteristic of normal behavior of ferrites. The dielectric constant was found to decrease with increasing Dy content in Ni-Cd ferrites. Ferrite sample with Dy3+ concentration, x = 0.05 show high dielectric constant, low dielectric loss and hence can be utilized in high frequency electrical circuits.

show abstract

Section: Ftir Analysismentioning

confidence: 99%

WITHDRAWN: Influence of trivalent rare earth (Dy3+) ions substitution on the structural, magnetic and dielectric properties of nanosized Ni0.6Cd0.4DyxFe2‒xO4 ferrites

Dubey

Lahiri

2020

Preprint

View full text Add to dashboard Cite

show abstract

“…8 Particles of various spinel ferrites can now be routinely prepared using the coprecipitation method by partial or complete replacement of Fe 2+ ions in magnetite (Fe 3 O 4 ) nanocrystals with other divalent transition metal ions (Co 2+ , Ni 2+ , Mn 2+ ) 4,[9][10][11] or with lanthanide ions (Gd 3+ , Eu 3+ , Dy 3+ ). 7,[12][13][14][15][16] In the case of Co, it is incorporated by partial or complete replacement of Fe 2+ ions in magnetite (Fe 3 O 4 ) nanocrystals. 4,9,[17][18] The complete replacement of Fe 2+ gives rise to cobalt ferrite that exhibits a cubic spinel structure with a ferromagnetic nature, [19][20] along with interesting electronic, magnetic, optic and catalytic properties.…”

Section: Introductionmentioning

confidence: 99%

“…Doping, which involves intentional addition of appropriate atoms or ions into the host materials, is one effective way of improving the physical/chemical characteristics of the parent materials to obtain desirable properties . Particles of various spinel ferrites can now be routinely prepared using the co-precipitation method by partial or complete replacement of Fe 2+ ions in magnetite (Fe 3 O 4 ) nanocrystals (NC) with other divalent transition-metal ions (Co 2+ , Ni 2+ , Mn 2+ ) ,− or with lanthanide ions (Gd 3+ , Eu 3+ , Dy 3+ ). ,− …”

Section: Introductionmentioning

confidence: 99%

Doped-Iron Oxide Nanocrystals Synthesized by One-Step Aqueous Route for Multi-Imaging Purposes

et al. 2019

View full text Add to dashboard Cite

New doped inorganic nanocrystals (NC) consisting on iron oxide and other metal integrated into the structure have been synthesized in one-step by adapting the oxidant precipitation synthesis route for magnetite. Different metals have been chosen to confer extra and unique properties to the resulting magnetic heteronanostructure: Co and Gd for enhancing transversal and longitudinal relaxivities for Magnetic Resonance Imaging (MRI), and Bi and Au for achieving X-Ray absorption for CT imaging. Apart of that, gold optical properties are interesting for photothermal therapy and iron oxides for magnetic hyperthermia. All metals have been incorporated during the synthesis to the magnetite structure in different ways: by forming a solid solution, by modifying the surface of the NCs or by cocrystallization with the magnetite. The nanostructure formed in each case depends on the ionic radius of the secondary metal ion and the solubility of its hydroxide that control the co-precipitation in the initial steps of the reaction.Magnetic properties and imaging capabilities of the heteronanostructures have been analyzed as a function of the element distribution. Due to the synergistic combination of the different element properties, these magnetic heteronanostructures have great potential for biomedical applications.

show abstract

“…The magnetic anisotropy of doped systems is impacted by the fact that magnetic characteristics vary in all directions [19]. However, additional concerns must be addressed, such as the presence of impurity phase beyond a certain doping concentration [20][21], doping-induced shape and magnetic anisotropy [14] [18], and the tendency of magnetic behavior with Dy 3+ substitution [18] [19]. The aim of this work to investigate the effect of GNP on structure, electrical, optical, dielectric, and magnetic properties of Mg 0.5 Cu 0.25 Co 0.25 Fe 2-x Dy x O 4 /GNP (x/GNP%=0.0/0.0%, 0.03/0.0%, 0.03/1.25%, 0.03/2.25%, 0.03/3.75%, 0.03/5%) ferrite composites (MCCDF-GNP Composites).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterizations of Mg-Cu-Co-Dy ferrites and their composites with graphene nanoplatelets (GNP)

Akhtar¹,

Hussain²,

Yusuf³

et al. 2022

JOR

View full text Add to dashboard Cite

Nanocrystalline spinel ferrite Mg0.5Cu0.25Co0.25Fe1.97Dy0.03O4 (MCCD-ferrites) and their composites with graphene nanoplatelets (GNP =0.0%, 1.25% 2.5%, 3.75%, 5%) were prepared by sol-gel technique and sintered at 850 oC for 5 hours. Measurements in the areas of X-ray diffraction, electrical, optical, dielectric and magnetic properties were used to analyze the effects of the inclusion of graphene with ferrite nanoparticles. The crystallite size was determined in the range of 27.62 – 41.46 (nm). The optical bandgap was found in the range of 3.50 eV to 2.88 eV. The dielectric loss was measured between 8 Hz and 8 MHz at room temperature (RT). Magnetic characteristics of the materials are measured and calculated. The magnetic performances of MCCDF-GNP Composites nanoparticles are improved with an increase in saturation (Ms) magnetization. This material can be utilized for humidity sensors, antennae, and micro memory chips.

show abstract

Dysprosium doping induced shape and magnetic anisotropy of Fe3−Dy O4 (x=0.01–0.1) nanoparticles

Cited by 26 publications

References 17 publications

WITHDRAWN: Influence of trivalent rare earth (Dy3+) ions substitution on the structural, magnetic and dielectric properties of nanosized Ni0.6Cd0.4DyxFe2‒xO4 ferrites

WITHDRAWN: Influence of trivalent rare earth (Dy3+) ions substitution on the structural, magnetic and dielectric properties of nanosized Ni0.6Cd0.4DyxFe2‒xO4 ferrites

Doped-Iron Oxide Nanocrystals Synthesized by One-Step Aqueous Route for Multi-Imaging Purposes

Synthesis and characterizations of Mg-Cu-Co-Dy ferrites and their composites with graphene nanoplatelets (GNP)

Contact Info

Product

Resources

About