Investigation on the structural, magnetic, dielectric and impedance analysis of Mg0.3-Ba Cu0.2Zn0.5Fe2O4 nanoparticles

Gholizadeh, Ahmad; Beyranvand, Morteza

doi:10.1016/j.physb.2020.412079

Cited by 76 publications

(10 citation statements)

References 37 publications

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“…The coercivity is found to consist of contributions due to the magneto‐crystalline anisotropy (related to the anisotropy constant), shape anisotropy (related to the shape of the grains), magnetoelastic anisotropy (related to the internal stresses), and surface anisotropy (related to the reduced symmetry) 59 . Therefore, the total anisotropy energy ( K eff V ) corresponds to the energy barrier for reversing the magnetization is written as follows 60 :

\begin{equation}{K}_{eff}V = {E}_{shape} + {E}_{surface} + {E}_{ME} + {E}_{MC}\end{equation}

where E shape is the shape anisotropy, E surface is surface anisotropy, E ME is magnetoelastic anisotropy, and E ME is magneto‐crystalline anisotropy. The anisotropy constant ( K 1 ) can be determined by the anisotropy field ( H a ) and the saturation magnetization ( M s ) as follows:

\begin{equation} {K}_1 = \frac{{{H}_a{M}_s}}{2} \end{equation}

where H a is proportional to b calculated from the LAS method 61 :

\begin{equation}{H}_a = \sqrt {15b} \end{equation}

…”

Section: Resultsmentioning

confidence: 99%

“…The coercivity is found to consist of contributions due to the magneto-crystalline anisotropy (related to the anisotropy constant), shape anisotropy (related to the shape of the grains), magnetoelastic anisotropy (related to the internal stresses), and surface anisotropy (related to the reduced symmetry). 59 Therefore, the total anisotropy energy (K eff V) corresponds to the energy barrier for reversing the magnetization is written as follows 60 :…”

Section: Magnetic Propertiesmentioning

confidence: 99%

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Effects of Ca–Gd co‐substitution on the structural, magnetic, and dielectric properties of M‐type strontium hexaferrite

Gholizadeh

Banihashemi

2023

J Am Ceram Soc.

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Sr 1−x Ca x Fe 12−x Gd x O 19 (x = 0, 0.04, 0.08, 0.12, 0.16, 0.20) hexaferrites were characterized by several techniques, such as X-ray diffraction, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy, and vibrating sample magnetometer. Structural results indicate the formation of a pure-phase Sr 1−x Ca x Fe 12−x Gd x O 19 hexaferrite with space group P6 3 /mmc. SEM photography confirms that there are a smaller number of defects due to the reduced porosity and surface area (increased particle size). Magnetic investigations showed a rise of the coercive force from 5069.8 to 5757.4 Oe and saturation magnetization from 79.25 to 80.68 emu/g. The maximum values appear to be for sample x = 0.16, which may be useful in such as permanent magnets, and high-density media for magnetic storage devices. Dielectric parameters, such as conductivity, the real part of permittivity, dielectric loss, dielectric tangent loss, and complex modulus, were studied. Impedance analysis shows that the conduction process is mainly governed by the long-range movement of the charge carriers based on the Debye model for x = 0.12.

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\begin{equation}{K}_{eff}V = {E}_{shape} + {E}_{surface} + {E}_{ME} + {E}_{MC}\end{equation}

\begin{equation} {K}_1 = \frac{{{H}_a{M}_s}}{2} \end{equation}

where H a is proportional to b calculated from the LAS method 61 :

\begin{equation}{H}_a = \sqrt {15b} \end{equation}

…”

Section: Resultsmentioning

confidence: 99%

Section: Magnetic Propertiesmentioning

confidence: 99%

Effects of Ca–Gd co‐substitution on the structural, magnetic, and dielectric properties of M‐type strontium hexaferrite

Gholizadeh

Banihashemi

2023

J Am Ceram Soc.

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“…E 4 is correlated to the atomic structures of the crystal host and presents preferential directions for the magnetization. Therefore, the nonmonotonous variations in coercive fields are resulted from the contribution of the three anisotropy energies, namely surface anisotropy ( E 2 ), magnetoelastic anisotropy ( E 3 ), and magnetocrystalline anisotropy energy ( E 4 ), for both sets of prepared samples of H-CoErSm NSFs and S-CoErSm NSFs …”

Section: Resultsmentioning

confidence: 99%

Impact of Sm³⁺ and Er³⁺ Cations on the Structural, Optical, and Magnetic Traits of Spinel Cobalt Ferrite Nanoparticles: Comparison Investigation

et al. 2022

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In this study, we investigated a comparison of the structure, morphology, optic, and magnetic (room temperature (RT)) features of Er3+ and Sm3+ codoped CoFe2O4 (CoErSm) nanospinel ferrite (NSFs) (x ≤ 0.05) synthesized via hydrothermal (H-CoErSm NSFs) and sonochemical (S-CoErSm NSFs) approaches. The formation of all products via both synthesis methods has been validated by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM), along with energy-dispersive X-ray (EDX) and transmission electron microscopy (TEM) techniques. The single phase of the spinel structure (except for the Hyd sample with x = 0.03) was evidenced by XRD analysis. The D XRD (crystallite size) values of H-CoErSm and S-CoErSm NSFs are in the 10–14.7 and 10–16 nm ranges, respectively. TEM analysis presented the cubic morphology of all products. A UV–visible percent diffuse reflectance (DR %) study was performed on all products, and E g (direct optical energy band gap) values varying in the 1.32–1.48 eV range were projected from the Tauc plots. The data of RT magnetization demonstrated that all prepared samples are ferromagnetic in nature. M–H data revealed that rising the contents of cosubstituent elements (Sm3+ and Er3+ ions) caused an increase in M s (saturation magnetization) and H c (coercive field) in comparison to pristine samples. Although concentration dependence is significant (x > 0.02), no strict regularity (roughly fluctuating) has been ruled out in M s values for doped samples prepared via the hydrothermal method. However, sonochemically prepared samples demonstrated that M s values increase with increasing x up to x = 0.04 and then decrease with the further rise in cosubstituent Sm3+ and Er3+ ions. The calculated values of M s and H c were found to be greater in H-CoErSm NSFs compared to those in S-CoErSm NSFs. The present investigation established that the distribution of cations and the variation in crystallite/particle sizes are efficient to control the intrinsic properties of all samples.

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“…The strong bands observed at around 660 cm -1 and 545 cm -1 are originated from stretching vibration of the Mn-O bond lengths and bending vibrations bond of O-B-O bond angles in octahedron BO 6 of SrMnO 3 perovskite structure, respectively (Esmaili and Gholizadeh 2020;Gholizadeh 2019;Gholizadeh and Malekzadeh 2017). The positions of two strong bands observed at around 580 cm -1 and 450 cm -1 are assigned to vibrations of the metaloxygen in tetrahedral and octahedral sites of spinel cubic structure, respectively (Gholizadeh and Beyranvand 2020;Gholizadeh 2017). There are two peaks located at 3100 and 3400 cm -1 that are attributed to O-H bond stretching.…”

Section: Ft-ir Analysismentioning

confidence: 95%

Comparing Catalytic Activity of MgMnO3 and SrMnO3 Nanocatalyst for Synthesis of Polyhydroquinoline and New Derivatives via Hantzsch Reaction

Soleimani

Salehi

Gholizadeh

2020

Iran J Sci Technol Trans Sci

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Spinel-type oxide MgMnO 3 and perovskite-type oxide SrMnO 3 have been synthesized by two-step procedures comprising the hydrothermal and solid-state methods. The as-prepared catalysts were characterized by X-ray powder diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis and the morphologies of the synthesized materials were figured out by field emission scanning electron microscopy. The catalytic performance of synthesized materials were investigated by synthesizing the polyhydroquinolines, which was used Design-Expert software and response surface methodology (central composite design) for optimization of reaction efficiently. The comparison study illustrates that MgMnO 3 has better catalytic performance than SrMnO 3 and optimized condition for the synthesis of polyhydroquinoline (which is produced by the reaction of ethyl acetoacetate, benzaldehyde, dimedone and ammonium acetate) was found to be 8 mg of MgMnO 3 as the catalyst, 33 min for the reaction time and 100°C for the reaction temperature. This condition was used for the synthesis of other polyhydroquinoline derivatives.

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Investigation on the structural, magnetic, dielectric and impedance analysis of Mg0.3-Ba Cu0.2Zn0.5Fe2O4 nanoparticles

Cited by 76 publications

References 37 publications

Effects of Ca–Gd co‐substitution on the structural, magnetic, and dielectric properties of M‐type strontium hexaferrite

Effects of Ca–Gd co‐substitution on the structural, magnetic, and dielectric properties of M‐type strontium hexaferrite

Impact of Sm³⁺ and Er³⁺ Cations on the Structural, Optical, and Magnetic Traits of Spinel Cobalt Ferrite Nanoparticles: Comparison Investigation

Comparing Catalytic Activity of MgMnO3 and SrMnO3 Nanocatalyst for Synthesis of Polyhydroquinoline and New Derivatives via Hantzsch Reaction

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Investigation on the structural, magnetic, dielectric and impedance analysis of Mg0.3-Ba Cu0.2Zn0.5Fe2O4 nanoparticles

Cited by 76 publications

References 37 publications

Effects of Ca–Gd co‐substitution on the structural, magnetic, and dielectric properties of M‐type strontium hexaferrite

Effects of Ca–Gd co‐substitution on the structural, magnetic, and dielectric properties of M‐type strontium hexaferrite

Impact of Sm3+ and Er3+ Cations on the Structural, Optical, and Magnetic Traits of Spinel Cobalt Ferrite Nanoparticles: Comparison Investigation

Comparing Catalytic Activity of MgMnO3 and SrMnO3 Nanocatalyst for Synthesis of Polyhydroquinoline and New Derivatives via Hantzsch Reaction

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Impact of Sm³⁺ and Er³⁺ Cations on the Structural, Optical, and Magnetic Traits of Spinel Cobalt Ferrite Nanoparticles: Comparison Investigation