Rare earth metals' influence on the heat generating capability of cobalt ferrite nanoparticles

Vîrlan, Constantin; Bulai, Georgiana; Caltun, Ovidiu Florin; Hempelmann, Rolf; Pui, Aurel

doi:10.1016/j.ceramint.2016.04.121

Cited by 54 publications

(11 citation statements)

References 27 publications

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“…In addition, even if the entire quantity of rare earth could enter the spinel lattice, both 3d-4f coupling and 4f-5d-4f coupling are weak interactions compared to Fe-Fe interactions which govern the magnetic response [19]. Coercivity of annealed samples presented a non-linear behavior with the increase of RE content, similarly to the behavior observed for as-prepared samples as reported in [24].…”

Section: Preprintssupporting

confidence: 65%

“…Consequently, there is no significant error in data taken by VSM and hyperthermia measurements, with respect to the actual values of magnetic mass. In a previous work, mass magnetization values of as prepared RE doped Co ferrites were found to be lower, in the area of 50-60 Am 2 /kg while coercivity was higher for the as prepared samples [24]; pure cobalt ferrite nanoparticles annealed at 1250 °C presented coercive field of 31.1 mT and magnetization of 73.6 emu/g at 1 T maximum applied field [15]. Our annealed nanoparticles have larger sizes, and this is consistent with our observations of their magnetic properties.…”

Section: Magnetic and Hyperthermia Propertiesmentioning

confidence: 78%

“…The as-prepared materials under study were synthesized by co-precipitation method as reported in detail by Virlan et al [24]. Carboxymentyl cellulose (CMC) was used as natural surfactant in a similar scheme as the one presented in [29], where the appropriate concentrates of reactants were used to achieve the desired stoichiometry for each sample.…”

Section: Methodsmentioning

confidence: 99%

“…Phase composition and structural parameters have been studied by Rietveld analysis of X-ray diffraction data; the extent of RE substitution that could be achieved in the spinel structure was investigated. Thermal efficiency was studied by using both the magnetometric approach as well as the calorimetric approach [24,27]; in the latter case an adiabatic approximation correction was applied in a similar scheme but with different field parameters compared to those reported in [24]. Magnetic hyperthermia measurements and minor hysteresis loops were utilized in order to compare Specific Loss Power (SLP) values of the samples with different dopant substitution and stoichiometry, before and after heat treatment.…”

Section: Introductionmentioning

confidence: 99%

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Heating Efficiency of CoFe2-xRExO4 (RE=Dy, Yb, Gd) Magnetic Nanoparticles for Hyperthermia Applications

Koutsoumbou¹,

Tsiaoussis²,

Bulai³

et al. 2020

Preprint

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Cobalt ferrite nanoparticles (NPs) doped with rare earth (RE) metals with general formula CoFe2-xRExO4 (RE=Yb, Dy, Gd; x = 0.0 - 0.3) were synthesized by the co-precipitation method followed by post thermal treatment. The influence of RE doping on structural, magnetic and thermal properties and potential biomedical applications like magnetic hyperthermia has been investigated. In the as-prepared samples RE cations enter the spinel lattice as detected by X-ray diffraction. Thermal treatment leads to thermodynamically stable and relaxed single-phase spinel structures only for lower RE content, x = 0.01-0.05. However, annealed samples present higher mass magnetization values (MS), up to 83 Am2/kg. RE content also affects MS, especially in the case of annealed samples where it decreases linearly with x from about 80 Am2/kg (x = 0.01) to about 60 Am2/kg (x = 0.30). Thermal treatment induces a reduction in coercivity from 60-100 mT for as-prepared samples to 18-33 mT for annealed samples, in a nonlinear manner with respect to RE content. Heating efficiency, i.e., Specific Loss Power (SLP), of all samples has been studied using both magnetometric and calorimetric method to deeper examine the energy loss mechanisms involved.

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Section: Preprintssupporting

confidence: 65%

Section: Magnetic and Hyperthermia Propertiesmentioning

confidence: 78%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Heating Efficiency of CoFe2-xRExO4 (RE=Dy, Yb, Gd) Magnetic Nanoparticles for Hyperthermia Applications

Koutsoumbou¹,

Tsiaoussis²,

Bulai³

et al. 2020

Preprint

Self Cite

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“…They have great potential for applications in medicine, for hyperthermia treatment, controlled drug delivery and biosensors, electronics, as humidity or gas sensor, magnetic field sensors, inductors and high frequency applications, as well as applications as catalysts and photocatalysts for various reactions or the removal of undesired pollutants . As a response to the large demand numerous techniques have been employed to obtained ferrites in nanoparticle form, thin and thick films, or controlled morphology such as nanocubes and nanorods .…”

Section: Introductionmentioning

confidence: 99%

Increased sensibility of mixed ferrite humidity sensors by subsequent heat treatment

Vîrlan

Tudorache

Pui

2017

Int J Applied Ceramic Tech

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The study presents the effects of different calcination temperatures on the size and morphology of mixed Co‐Ni ferrites, and the respective changes in the magnetic and electrical properties, with emphasis on their applicability as humidity sensors. The data suggests that the heat treatment does not significantly change the magnetic properties, but significant variations on the morphology of the nanoparticles, correlated with large changes in the electrical properties of the nanoparticles in terms of electrical permittivity and resistivity with electrical field frequency and humidity, with a clear influence of the calcination temperature over the sensibility of the materials to humidity.

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Mössbauer study of iron oxide nanoparticles

Karra,

Sarafidis

2024

Applied Research

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Magnetic nanoparticles have recently attracted attention for biochemical and medical applications like drug delivery and hyperthermia for a variety of reasons with most important being their stability, chemical compatibility, and suitable magnetic properties like moderate specific mass magnetization. Cobalt ferrites are a well‐studied family of materials and the partial substitution of Fe3+ cations by rare earth (RE) ones may be used to tune the magnetic properties. In the present work pure and substituted Co ferrite nanoparticles with nominal stoichiometry CoFe2‐xRxO4 (R = Yb, Gd; x = 0.05, 0.1, 0.3) synthesized by the co‐precipitation method are studied with 57Fe Mössbauer spectroscopy in order to determine the incorporation of RE ions in the spinel lattice. The fitting procedure was based on the standard spinel model using two sextets for the octahedral and the tetrahedral coordinated positions of Fe atoms. All isomer shift values were found within the typical range of high spin ferric ions while quadrupole splitting values strongly suggest that there is a substitution preference; RE ions replace iron ones in octahedral sites. The inversion parameter was found to decrease with RE content (lowest value about 0.534 for CoFe1.90Yb0.10O4) and thermal treatment always results in changing the material towards normal spinel, while pure CoFe2O4 was inverse. Thermal treatment of substituted materials in ambient air at temperature range 1500‐1700 K for 12 hours increase crystallite size and changes the degree of inversion.This article is protected by copyright. All rights reserved.

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Rare earth metals' influence on the heat generating capability of cobalt ferrite nanoparticles

Cited by 54 publications

References 27 publications

Heating Efficiency of CoFe<sub>2-x</sub>RE<sub>x</sub>O<sub>4</sub> (RE=Dy, Yb, Gd) Magnetic Nanoparticles for Hyperthermia Applications

Heating Efficiency of CoFe<sub>2-x</sub>RE<sub>x</sub>O<sub>4</sub> (RE=Dy, Yb, Gd) Magnetic Nanoparticles for Hyperthermia Applications

Increased sensibility of mixed ferrite humidity sensors by subsequent heat treatment

Mössbauer study of iron oxide nanoparticles

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