Magnetic properties of CoFe2O4 ferrite doped with rare earth ion

Zhao, Lijun; Yang, Hua; Zhao, Xueping; Yu, Lianxiang; Cui, Yuming; Feng, Shouhua

doi:10.1016/j.matlet.2005.07.017

Cited by 179 publications

(55 citation statements)

References 14 publications

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“…54 The possible defects in the powdered samples are evaluated on the base of the calculated lattice strain. In spite of the expectations that the lattice strain induces structural distortion and by that transforms the properties, 55 we did not observe a correlation between the lattice strain and the photocatalytic activity. The sample with the best activity among the ternary oxides, ZC31/8, has the lowest value of lattice strain.…”

Section: Discussioncontrasting

confidence: 99%

Mixed Metal Oxides of the Type CoxZn1–xFe2O4 as Photocatalysts for Malachite Green Degradation Under UV Light Irradiation

Tzvetkov¹,

Milanova²,

Cherkezova‐Zheleva

et al. 2017

ACSi

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A combination of thermal and mechanical (high energy ball milling) treatment was applied in an attempt to obtain polycrystalline mixed metal binary and ternary oxides of the type Co x Zn 1-x Fe 2 O 4 (x = 0; 0.25; 0.5; 0.75; 1). The synthetic procedure used successfully produced single-phased, homogeneous ZnFe 2 O 4 , CoFe 2 O 4 , and Co 0.75 Zn 0.25 Fe 2 O 4 , as well as mixed oxides, whose composition depended both on the duration of the high energy ball milling and the ratio Zn(II)/Co(II). The formation of spinel-like structures was proved by XRD, Mössbauer spectroscopy and Raman spectroscopy. For the characterization of the samples low-temperature N 2 adsorption, UV/Vis spectroscopy and transmission electron microscopy were applied. The energy band gap of the samples was calculated, suggesting they are promising photocatalysts. The decomposition of the Malachite Green in model water solutions under UV-light irradiation was successfully achieved in the presence of the samples as photocatalysts. The highest rate constant was obtained for the sample synthesized at longer milling time in combination with higher Zn(II)/Co(II) ratio. The photocatalytic activity of the ternary mixed oxides was compared with the pure hematite, α-Fe 2 O 3 , and the binary ZnFe 2 O 4 and CoFe 2 O 4 ferrites with spinel structure that were treated in the same way. A synergetic effect of α-Fe 2 O 3 and the spinel-like structure on the photocatalytic properties of ternary mixed metal oxides was detected.

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Section: Discussioncontrasting

confidence: 99%

Mixed Metal Oxides of the Type CoxZn1–xFe2O4 as Photocatalysts for Malachite Green Degradation Under UV Light Irradiation

Tzvetkov¹,

Milanova²,

Cherkezova‐Zheleva

et al. 2017

ACSi

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“…However, nano-crystalline cobalt ferrite has recently been reported as a hard magnetic material due to its high coercivity (5400 Oe) as compared with co-ferrite prepared via conventional powder sintering [16]. There has been a surge in research activity into ultrafine cobalt ferrite preparation techniques, in particular the sol-gel method [17][18][19], but also by an emulsion method [20] and by complexometric synthesis [21]. One major driving force for this activity is the potential use of cobalt ferrite as high-density storage media where the ferrite particles must be less than 10 nm to avoid exchange interactions between neighbouring grains [22].…”

Section: Introductionmentioning

confidence: 99%

Sintering behaviour of cobalt ferrite ceramic

Rafferty

Prescott

Brabazon

2008

Ceramics International

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Pure cobalt ferrite ceramic powder was prepared using standard solid-state ceramic processing. Uniaxially pressed pure cobalt ferrite discs, sintered under isothermal ramp rate and single dwell time conditions, yielded a maximum theoretical density (%Dth) of <90%. Discs made from finer particle size powder yielded a %Dth of 91.5%. Based on dilatometry analysis, a sintering profile comprising non-isothermal sintering, and two-step sintering was devised, yielding discs with %Dth of 96%. Cylindrical rods of pure cobalt ferrite were cold iso-statically pressed and sintered according to the revised sintering profile. Pycnometry analysis was used to quantify the percentages of open and closed pores in the rods after sintering.

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“…5 The magnetic and magnetoelastic properties of ferrites are dependent on exchange interactions, and the latter depend on how the cations are distributed among the two sublattices. [6][7][8] Tailoring the chemical composition of cobalt ferrites allows control of the physical properties, including the temperature dependence of magnetic properties and magnetomechanical hysteresis. Recently cobalt ferrite based composites have received attention because of their high magnetostriction, high sensitivity of magnetic induction to applied stress, chemical stability and low cost.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and magnetoelastic properties of Cr-substituted cobalt ferrite

Lee

Matlage

et al. 2007

Journal of Applied Physics

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We have investigated the magnetic and magnetoelasticproperties of a series of Cr-substituted cobaltferriteCoCrxFe2−xO4 (x=0.0-0.79) samples. Substitution of Cr for some of the Fe in cobaltferrite reduced the Curie temperature, and the effect is more pronounced than that observed in Mn-substituted cobaltferrite samples. Cr substitution also caused the maximum magnetostriction to decrease at a greater rate than substitution of the same amount of Mn. The maximum of the strain derivative, dλ/dH, was reached for x=0.38. The behavior of the Curie temperature of Cr-substituted and Mn-substituted cobaltferrites has been analyzed using the Néel molecular field model and compared with recent Mössbauer spectroscopy results. We have investigated the magnetic and magnetoelastic properties of a series of Cr-substituted cobalt ferrite CoCr x Fe 2−x O 4 ͑x = 0.0-0.79͒ samples. Substitution of Cr for some of the Fe in cobalt ferrite reduced the Curie temperature, and the effect is more pronounced than that observed in Mn-substituted cobalt ferrite samples. Cr substitution also caused the maximum magnetostriction to decrease at a greater rate than substitution of the same amount of Mn. The maximum of the strain derivative, d / dH, was reached for x = 0.38. The behavior of the Curie temperature of Cr-substituted and Mn-substituted cobalt ferrites has been analyzed using the Néel molecular field model and compared with recent Mössbauer spectroscopy results.

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Magnetic properties of CoFe2O4 ferrite doped with rare earth ion

Cited by 179 publications

References 14 publications

Mixed Metal Oxides of the Type CoxZn1–xFe2O4 as Photocatalysts for Malachite Green Degradation Under UV Light Irradiation

Mixed Metal Oxides of the Type CoxZn1–xFe2O4 as Photocatalysts for Malachite Green Degradation Under UV Light Irradiation

Sintering behaviour of cobalt ferrite ceramic

Magnetic and magnetoelastic properties of Cr-substituted cobalt ferrite

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