Interrelation between cationic distribution and electromagnetic properties of vanadium-substituted Mn–Zn ferrites

Hossain, Abul; Esha, I. N.; Elius, Iftakhar Bin; Khan, M. N. I.; Maria, Kazi Hanium

doi:10.1007/s10854-020-04874-7

Cited by 13 publications

(2 citation statements)

References 66 publications

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“…The dielectric behaviour is controlled by different constituents polarizations arising from interfacial charge, space charge, oriental dipolar, ionic and electronic contributions [53]. Owing to the fact that the real decays rapidly beyond 1 kHz, we attribute this to interfacial and space charge polarization effects [35,54,55]. This polarization may arise due to charges trapped at the interface between the sample and the electrodes, space charges at the grain boundaries, interstitial and voids.…”

Section: E Dielectric Measurementsmentioning

confidence: 99%

Room temperature ferroic orders in Zr and (Zr, Ni) doped SrTiO$_3$

Ahmed¹,

Faysal²,

Khan³

et al. 2021

Preprint

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We synthesized strontium titanate SrTiO3 (STO), Zr doped Sr1-xZrxTiO3 and (Zr, Ni) co-doped Sr1-xZrxTi1-yNiyO3 samples using solid state reaction technique to report their structural, electrical and magnetic properties. The cubic P m-3m phase of the synthesized samples has been confirmed using Rietveld analysis of the powder X-ray diffraction pattern. The grain size of the synthesized materials was reduced significantly due to Zr doping as well as (Zr, Ni) co-doping in STO. The chemical species of the samples were identified using energy-dispersive X-ray spectroscopy. We observed forbidden first order Raman scattering at 148, 547 and 797 cm −1 which may indicate nominal loss of inversion symmetry in cubic STO. The absence of absorption at 500 cm −1 and within 600-700 cm −1 band in Fourier Transform Infrared spectra corroborates Zr and Ni as substitutional dopants in our samples. Due to 4% Zr doping in Sr0.96Zr0.04TiO3 sample dielectric constant, remnant electric polarization, remnant magnetization and coercivity were increased. Notably, in the case of 4% Zr and 10% Ni co-doping we have observed clearly the existence of both FE and FM hysteresis loops in Sr0.96Zr0.04Ti0.90Ni0.10O3 sample. In this co-doped sample, the remnant magnetization and coercivity were increased by ∼1 and ∼2 orders of magnitude respectively as compared to those of undoped STO. The coexistence of FE and FM orders in (Zr, Ni) co-doped STO might have the potential for interesting multiferroic applications.

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Section: E Dielectric Measurementsmentioning

confidence: 99%

Room temperature ferroic orders in Zr and (Zr, Ni) doped SrTiO$_3$

Ahmed¹,

Faysal²,

Khan³

et al. 2021

Preprint

Self Cite

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“…Vanadium addition, according to Janghorban and Shokrollahi, improves the magnetic characteristics and grain development of Mn-Zn ferrites up to a point [18]. Most recently Hossain et al explored that the addition of vanadium shows a decreasing trend of porosity, dielectric constants, and permeability and an increasing trend of grain size, Magnetic saturation (Ms) with an improvement in resistivity [19]. From the aforementioned findings, it can be inferred that vanadium significantly affects the microstructure, which affects the magnetic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Structural, Electrical and Magnetic Properties of Vanadium Substituted Mn-Zn Ferrites

Jyoti

Biswas

Rana

et al. 2023

Preprint

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This work revealed the role of altering vanadium (V) content in Mn–Zn ferrites. We used the traditional solid-state reaction method to prepare the Mn_0.5 Zn_0.5 V_x Fe_(2 - x) O_4 (x = 0.0, 0.05, 0.10, 0.15, 0.20) ferrites. Powder X-ray diffraction was used to analyze the samples' crystal structures, revealing the prepared sample's spinal cubic crystal structure. With increasing Vanadium concentration, the lattice constant drops proportionately. We used Debye-Scherrer (D-S), Williamson-Hall (W-H) Plot, Halder-Wagner (H-W) Langford, and Size Strain Plot (SSP) methods to compare different structural properties. We also used the impedance analyzer to investigate the samples' dielectric characteristics and AC conductivity at room temperature over a frequency range of 1 KHz to 100 MHz. The magnetic properties, i.e., Saturation magnetization (Ms), Coercive field (Hc), and Remanent magnetization (Mr), were estimated from the ferromagnetic hysteresis behavior of the samples measured using a vibrating sample magnetometer (VSM). The saturation magnetization was observed to decrease with an increase in V content. The Mr and HC vary non-linearly with V contents. The prepared samples' initial permeability was tested, and a reasonably constant complex permeability (µ') was recorded over a wide frequency range (~ 1000 Hz).

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In Situ Pt Migration Enabled Resurrection of Electrocatalyst and Fuel Cell Device

Lei,

Cui,

Cao

et al. 2023

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In direct methanol fuel cells (DMFCs), the poisoning of noble metals is considered to be a major impediment to their commercial development. Here, it is found that the loss of surface Pt is one main reason for the attenuation of catalyst performance during long‐time methanol oxidation reaction (MOR). A strategy to realize in situ resurrection of the deactivated catalyst by migrating Pt atoms inside to the surface is innovatively proposed. A high‐activity Pt‐SnO2 is designed, whose MOR activity is resurrected to 97.4% of the initial value. Based on this, the multiple resurrection of a DMFC device is also achieved for the first time. This work provides a new approach for the solution of catalyst deactivation and the development of sustainable catalysts as well as fuel cells.

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Interrelation between cationic distribution and electromagnetic properties of vanadium-substituted Mn–Zn ferrites

Cited by 13 publications

References 66 publications

Room temperature ferroic orders in Zr and (Zr, Ni) doped SrTiO$_3$

Room temperature ferroic orders in Zr and (Zr, Ni) doped SrTiO$_3$

Investigation of the Structural, Electrical and Magnetic Properties of Vanadium Substituted Mn-Zn Ferrites

In Situ Pt Migration Enabled Resurrection of Electrocatalyst and Fuel Cell Device

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