Annealing effects on the magnetic properties of nanocrystalline zinc ferrite

Tung, Le Duc; Kolesnichenko, Vladimir; Caruntu, Gabriel; Caruntu, Dumitru I.; Remond, Yann; Golub, Vladimir; O’Connor, Charles J.; Spînu, Leonard

doi:10.1016/s0921-4526(02)01114-6

Cited by 109 publications

(71 citation statements)

References 17 publications

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“…RF heating provides efficient, fast and uniform heat transfer into catalyst [5,6] and flowing fluid [7][8][9][10]. among others, on the sintering conditions and grain size [11,12]. As the grain size of nanostructured ferrites is much smaller than the skin depth, their heating rate in the kHz range is considerably higher than that of the bulk ferrites.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pr3+ substitution on the microstructure, specific surface area, magnetic properties and specific heating rate of Ni0.5Zn0.5Pr Fe2−O4 nanoparticles synthesized via sol–gel method

Yan

Gao

et al. 2015

Journal of Alloys and Compounds

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xia. (2015) Effect of Pr3+ substitution on the microstructure, specific surface area, magnetic properties and specific heating rate of Ni0.5Zn0.5PrxFe2−xO4 nanoparticles synthesized via sol-gel method. Journal of Alloys and Compounds,. Permanent WRAP URL:http://wrap.warwick.ac.uk/94091 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription. Abstract: A series of Ni-Zn ferrite nanoparticles with a nominal composition of Ni0.5Zn0.5Prx Fe2-xO4 (x=0.000 -0.100 with steps of 0.025) has been synthesized by a sol-gel method. The effect of composition and calcination temperature on the morphology, specific surface area, magnetic properties and specific heating rate has been studied. The Ni-Zn-Pr ferrites have a single spinel (NZF) phase at Pr loadings below 5 at%. A minor amount of an orthorhombic PrFeO3 phase is present in the Ni-Zn-Pr ferrites at Pr loadings above 5 at%. At a Pr loading of 10 at%, the specific surface area increases six-fold as compared to that of the non-doped Ni0.5Zn0.5Fe2O4 sample. As the Pr loading increases, the saturation magnetization, remnant magnetization and coercivity increase and reach the maximum at x = 0.05 and then decrease. The maximum values of these parameters are 67.0 emu/g, 9.7 emu/g and 87.2Oe, respectively. Under radiofrequency field (frequency: 295 kHz, intensity: 500 Oe), the highest heating rate of 1.65 K/s was observed over the sample with x = 0.025 which is 2.5 times higher than that of Ni0.5Zn0.5Fe2O4.

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Section: Introductionmentioning

confidence: 99%

Effect of Pr3+ substitution on the microstructure, specific surface area, magnetic properties and specific heating rate of Ni0.5Zn0.5Pr Fe2−O4 nanoparticles synthesized via sol–gel method

Yan

Gao

et al. 2015

Journal of Alloys and Compounds

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“…Tang et al have finely tuned particle size by controlling the annealing temperature, and the effect of particle size on magnetic behavior has been reported (Tung et al 2002). The blocking temperature has been found to increase and the (effective) anisotropy constant K A decreases with increasing particle size.…”

Section: Introductionmentioning

confidence: 99%

Role of mode of heating on the synthesis of nanocrystalline zinc ferrite

Chaudhari¹,

Gaikwad

Acharya

2014

Appl Nanosci

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In the present work, microwave-assisted coprecipitation route was used for synthesis of nanocrystalline zinc ferrite and results were compared with conventionally prepared zinc ferrite. Synthesis conditions were kept uniform in both cases, except that the mode of heating was changed. The effects of mode of heating on the material properties were studied systematically. Microstructures of both samples were studied by scanning electron microscopy and transmission electron microscopy and the particle size was found to be in the range of 3-4 nm. Particle size distribution in microwaveprocessed MS-ZnFe 2 O 4 is found to be highly uniform compared to conventionally processed samples (CS-ZnFe 2 O 4 ). XRD data confirmed the presence of single-phase face-centered cubic structure for both the samples. The XRD data fitted well with Reitveld refinement. The functional groups were analyzed by FT-IR. Local distortions in the structures were studied by FT-Raman spectra of zinc ferrites at room temperature. This study concludes that the microwaveassisted synthesis route reduced the time of reaction by around 23 h and developed uniformly distributed fine-scaled particles. This method has high potential to synthesize other ferrite materials also.

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“…Bulk ZnFe 2 O 4 is a normal spinel with all the Zn ions occupying tetrahedral sites and Fe 3+ ions occupying octahedral sites [5]. Magnetic studies on bulk ZnFe 2 O 4 showed the presence of strong paramagnetic phase at room temperature and a weak antiferromagnetic ordering below its Neel's temperature which is around 10 K [6,7]. But recent investigations [8][9][10] on nanoparticles of zinc ferrite report the presence of ferrimagnetic ordering at room temperature.…”

Section: Introductionmentioning

confidence: 99%