Structure and magnetic properties of NiZn ferrite nanoparticles

Virden, Anne; O’Grady, K.

doi:10.1016/j.jmmm.2004.11.398

Cited by 56 publications

(28 citation statements)

References 9 publications

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“…It is known that magnetic properties of ferrites are sensitive to preparation technique and their microstructures [7]. The electrical and magnetic properties of such ferrites depend strongly on distribution of cations at the tetrahedral (A) and octahedral (B) sites in the lattice [8][9][10]. It is well known that zinc ions can be used to alter the saturation magnetization.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, XRD & SEM Studies of Zinc Substitution in Nickel Ferrites by Citrate Gel Technique

Krishna¹,

Ravinder²,

Kumar³

et al. 2012

WJCMP

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Ni-Zn ferrite with a nominal composition of Ni 1-X Zn X Fe 2 O 4 (X = 0, 0.2, 0.6, 0.8, 0.9 and 1.0) ferrite powders have been successfully prepared at a very low temperature (180˚C) by a novel auto combustion process using citric acid as a coordinating agent. Phase purity of the solid solutions has been confirmed by X-ray diffraction. Morphological, elemental composition characterizations of the prepared samples were performed by high resolution scanning electron microscopy and energy dispersive spectroscopy (EDS). Magnetic properties of all samples are obtained by using VSM (Vibrating Sample Magnetometer) in the range of 10 K oe. The saturation magnetization values of the samples are carried out from the B-H loop. The effect of composition on saturation magnetization and magnetic moment are studied in this paper. The results showed that Saturation magnetization and magnetic moment values increases gradually as Zn 2+ composition increases, it reaches maximum value 70.28 emu/gm for (X = 0.6) and decreases further with increasing Zn 2+ composition.

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Section: Introductionmentioning

confidence: 99%

Synthesis, XRD & SEM Studies of Zinc Substitution in Nickel Ferrites by Citrate Gel Technique

Krishna¹,

Ravinder²,

Kumar³

et al. 2012

WJCMP

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“…The impact of particle size and material processing on the magnetic loss mechanisms and heating characteristics of magnetic particles is quite complicated but is fairly well understood thanks to previous research [19,20]. Theories have been developed that allow analytical techniques to optimize particle size and processing to maximize heating for a specified amplitude and frequency magnetic field [21,22].…”

Section: Introductionmentioning

confidence: 99%

Inductively Heated Shape Memory Polymer for the Magnetic Actuation of Medical Devices

Buckley

McKinley

Wilson

et al. 2006

IEEE Trans. Biomed. Eng.

332

205

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Presently there is interest in making medical devices such as expandable stents and intravascular microactuators from shape memory polymer (SMP). One of the key challenges in realizing SMP medical devices is the implementation of a safe and effective method of thermally actuating various device geometries in vivo. A novel scheme of actuation by Curiethermoregulated inductive heating is presented. Prototype medical devices made from SMP loaded with Nickel Zinc ferrite ferromagnetic particles were actuated in air by applying an alternating magnetic field to induce heating. Dynamic mechanical thermal analysis was performed on both the particle-loaded and neat SMP materials to assess the impact of the ferrite particles on the mechanical properties of the samples. Calorimetry was used to quantify the rate of heat generation as a function of particle size and volumetric loading of ferrite particles in the SMP. These tests demonstrated the feasibility of SMP actuation by inductive heating. Rapid and uniform heating was achieved in complex device geometries and particle loading up to 10% volume content did not interfere with the shape recovery of the SMP.

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“…Following the trend of the difference in the hyperfine fields at the A and B sites with Ni concentration, the saturation magnetization shows a linear increase from 32 Am 2 /kg to 41.5 Am 2 /kg with increase in Ni which is opposite to the situation in bulk Co-Zn and Ni-Zn ferrites where bulk Co-Zn ferrite is reported to have a higher saturation magnetization than Ni-Zn ferrite [12]. To understand this, the magnetic particle size of samples with x = 0 i.e., Co 0.5 Zn 0.5 Fe 2 O 4 and for Ni 0.5 Zn 0.5 Fe 2 O 4 i.e, the sample with x = 0.5 have been calculated following the Cantrell's method [13]. It is 1.6 nm for the sample with x = 0.0 while it is 2.4 nm for x = 0.5.…”

Section: Magnetization Studiesmentioning

confidence: 99%

Low temperature Mössbauer and DC magnetization studies in nano-sized Ni substituted Co–Zn ferrites

et al. 2011

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Studies in the series of nano ferrites pertaining to the stoichiometry Ni x Co 0.5−x Zn 0.5 Fe 2 O 4 , (0≤ x ≤0.5) show that contrary to the trend in bulk Co-Zn and Ni-Zn ferrites, the observed saturation magnetization of Ni-Zn ferrite (x = 0.5) is larger than Co-Zn ferrite (x = 0) and are due to finite size effects. This is evident from calculations which show that the magnetic particle sizes are 1.6 nm for Co-Zn ferrite and 2.4 nm for Ni-Zn whereas their average crystallite sizes are 5 to 3 nm respectively. Low temperature Mössbauer spectroscopic studies show that this can be attributed to an increase in an ordered core with the increase in Ni content which is reflected as a corresponding increase in the saturation magnetization.

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Structure and magnetic properties of NiZn ferrite nanoparticles

Cited by 56 publications

References 9 publications

Synthesis, XRD & SEM Studies of Zinc Substitution in Nickel Ferrites by Citrate Gel Technique

Synthesis, XRD & SEM Studies of Zinc Substitution in Nickel Ferrites by Citrate Gel Technique

Inductively Heated Shape Memory Polymer for the Magnetic Actuation of Medical Devices

Low temperature Mössbauer and DC magnetization studies in nano-sized Ni substituted Co–Zn ferrites

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Structure and magnetic properties of NiZn ferrite nanoparticles

Cited by 56 publications

References 9 publications

Synthesis, XRD &amp; SEM Studies of Zinc Substitution in Nickel Ferrites by Citrate Gel Technique

Synthesis, XRD &amp; SEM Studies of Zinc Substitution in Nickel Ferrites by Citrate Gel Technique

Inductively Heated Shape Memory Polymer for the Magnetic Actuation of Medical Devices

Low temperature Mössbauer and DC magnetization studies in nano-sized Ni substituted Co–Zn ferrites

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Synthesis, XRD & SEM Studies of Zinc Substitution in Nickel Ferrites by Citrate Gel Technique

Synthesis, XRD & SEM Studies of Zinc Substitution in Nickel Ferrites by Citrate Gel Technique