Magnetic Properties and Crystalline Transition for the NiCr1.7Fe0.3O4

Park, Seung-Iel; Choi, Kang Ryong; Kouh, Taejoon; Kim, Chul Sung

doi:10.4283/jmag.2007.12.4.137

Cited by 12 publications

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“…This was confirmed by Rietveld analysis of the XRD data, showing a slight mismatch in the calculated pattern indicating incomplete tetragonal to cubic phase transformation. The ferrimagnetic transition temperature, T C , was found to be above 300 K, higher than that reported values for the x 0.15 [15] and 187 K for x 0.1 [14]. For this compound the XPS studies indicated that the oxidation state of Ni is 2+, while that of Cr and Fe are 3+.…”

Section: Discussioncontrasting

confidence: 63%

“…3), corroborating the M pT q results. Park et al [15] substituted Fe at Cr site with x 0.15 and observed the transition temperature to be 250 K, while Barman and Ravi [14] found the enhancement of T C from 73 K for x 0 to 187 K for x 0.1. Present results indicate that increasing the Fe concentration from x 0.1 to 0.5, the ordering temperature increase drastically when compared to the magnetic behaviour of the host NiCr 2 O 4 .…”

Section: )mentioning

confidence: 99%

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Effect of Fe Substitution on Structural and Magnetic Properties of NiCr₂O₄

et al. 2018

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At room temperature, the normal oxide spinel NiCr2O4 is tetragonally distorted and crystallizes in the I41/amd space group due to cooperative Jahn-Teller ordering driven by the orbital degeneracy of tetrahedral Ni 2 . The ferrimagnetic Curie temperature (TCq for NiCr2O4 is 74 K. The magnetic moments of NiCr2O4 are composed of a ferrimagnetic (longitudinal) and an antiferromagnetic (transverse) component. Exchange interaction between the magnetic cations influences the overall magnetic properties of the compound. Present work focuses on the modification of structural and magnetic properties upon substituting Fe at Cr site in NiCr2O4 with the motivation of changing the magnetic exchange interaction. In order to do so, single phase Ni(Cr0.5Fe0.5q2O4 samples were prepared by co-precipitation techniques, while controlling the pH of precipitation. Upon Fe substitution, crystal structure was not affected much contrary to the earlier reports. In order to determine the oxidation state of each elements X-ray photoelectron spectroscopy (XPS) was performed. TC was found to increase dramatically above 300 K, confirmed both from temperature and field dependent dc-magnetization studies.

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Section: Discussioncontrasting

confidence: 63%

Section: )mentioning

confidence: 99%

Effect of Fe Substitution on Structural and Magnetic Properties of NiCr₂O₄

et al. 2018

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Room temperature ferromagnetism in laser ablated Zn ferrite thin films

Raghavender

2011

Materials Letters

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The effect of proton irradiation on magnetic properties of lithium ferrites

Hyun

Kouh

Kim

et al. 2009

Journal of Applied Physics

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The effect of proton irradiation on magnetic properties of lithium ferrites has been investigated with x-ray diffraction ͑XRD͒, magnetization, and Mössbauer spectroscopy measurements. Li 0.5 Fe 2.5 O 4 powders have been fabricated by the sol-gel method. Following the annealing at 700°C, these samples have been proton irradiated with 1, 5, and 10 pC/ m 2. The analysis of XRD patterns by Rietveld refinement method shows that these samples have ordered cubic spinel structures with space group of P4 3 32. We have observed that the corresponding lattice constant a 0 linearly increases from 8.3301 to 8.3314Ϯ 0.0001 Å with increasing proton irradiation. Compared to nonirradiated sample, which has the saturation magnetization ͑M s ͒ of 66.4 emu/g and oxygen occupancy of 3.9980 at room temperature, the values of magnetization and oxygen occupancy at room temperature are 66.0, 62.6, and 60.8 emu/g and 3.9840, 3.9452, and 3.9272, respectively, for 1, 5, and 10 pC/ m 2 irradiated powders. Also, the coercivity ͑H c ͒ decreases from 175.6 to 154.0 Oe with increasing proton irradiation. The Mössbauer spectra taken at room temperature show that the values of isomer shift ͑␦͒ for the tetrahedral ͑A͒ and octahedral ͑B͒ sites are consistent with the Fe 3+ valence state. The results suggest that the proton irradiation induces the oxygen vacancy defects, which in turn leads to the changes in magnetic properties.

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Magnetic Properties and Crystalline Transition for the NiCr_1.7Fe_0.3O₄

Cited by 12 publications

References 1 publication

Effect of Fe Substitution on Structural and Magnetic Properties of NiCr₂O₄

Effect of Fe Substitution on Structural and Magnetic Properties of NiCr₂O₄

Room temperature ferromagnetism in laser ablated Zn ferrite thin films

The effect of proton irradiation on magnetic properties of lithium ferrites

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Magnetic Properties and Crystalline Transition for the NiCr1.7Fe0.3O4

Cited by 12 publications

References 1 publication

Effect of Fe Substitution on Structural and Magnetic Properties of NiCr2O4

Effect of Fe Substitution on Structural and Magnetic Properties of NiCr2O4

Room temperature ferromagnetism in laser ablated Zn ferrite thin films

The effect of proton irradiation on magnetic properties of lithium ferrites

Contact Info

Product

Resources

About

Magnetic Properties and Crystalline Transition for the NiCr_1.7Fe_0.3O₄

Effect of Fe Substitution on Structural and Magnetic Properties of NiCr₂O₄

Effect of Fe Substitution on Structural and Magnetic Properties of NiCr₂O₄