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

Abstract

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.

Controllable synthesis of one-dimensional isolated Ni 0.5 Zn 0.5 Fe 2 O 4 microtubes for application as catalyst support in RF heated reactors

“…It should be mentioned that the observed particle size is somehow larger than the crystallite size obtained from the XRD study due to the formation of connecting necks between the two neighboring particles during calcination. No large aggregated nanoparticles are observed confirming much higher degree of dispersion as compared with a nontemplated synthesis method [37]. Due to this fact, the specific area of the Ni0.5Zn0.5Fe2O4 microtubes was considerably enhanced in this study.…”

Molecular Catalysts for OER/ORR in Zn–Air Batteries

“…The magnetothermal effect can increase the local temperature of magnetic catalysts resulting in enhancing the kinetics of OER [112]. In addition, composite magnetic catalysts can generate heat locally under AC magnetic field due to the internal flip of spins relative to the crystalline lattice (Néel relaxation) thereby increasing catalyst temperature [113][114][115][116]. Recent studies have revealed that structurally stable catalysts can undergo spin-state flipping changes by applying magneto-thermal perturbations using AMF, without altering their structure.…”

Structural Interpretation of Sintering Temperature Effect on Optical and Electrical Properties of Pr3+‐Substituted Nickel Ferrites

“…[ 19 ] Yan and his co‐workers reported that adding Pr 3+ ions in Ni–Zn ferrite reduces the average crystallite size and enhances specific surface area sixfold, exploring its catalytic applications. [ 20 ] Pr substitution in hexaferrite systems is reported to reduce the electron exchange between Fe 2+ and Fe 3+ ions at octahedral sites affecting their electrical properties. [ 21 ] Talebi et al explored potential photocatalytic applications under UV radiation of Co–ferrite when doped with Pr 3+ ions.…”