Study of microstructural, ferroelectric and magnetic properties of cerium substituted magnesium ferrite and its potential application as hydroelectric cell

Parray, Ishfaq Ahmad; Somvanshi, Anand; Ali, Sabir

doi:10.1016/j.ceramint.2022.10.223

Cited by 22 publications

(6 citation statements)

References 61 publications

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“…The sample's porosity stayed within the 17.822%-23.283% range. This behavior is consistent with the predictions, as a greater doping level causes the material to become denser and have fewer voids [55]. Dislocation density (δ) is a degree of the density of crystal lattice defects in a material.…”

Section: Structural Investigationsupporting

confidence: 87%

Effect of ferromagnetic cobalt on characteristics of coercive Aluminium substituted BaFe_11.5Al_0.5O₁₉ hexaferrites

Ijaz,

Asif,

El-Zahhar

et al. 2023

Phys. Scr.

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Magnetic and structural characteristics of M-type barium hexaferrite nanoparticles can be tuned by doping different di or trivalent metal ions. Here BaFe11.5-xAl0.5CoxO19 hexaferrite nanoparticles were synthesized using a sol-gel process, and the influence of doping concentrations on M-type BaFe11.5-xAl0.5CoxO19 hexaferrite nanoparticles was deliberated. The XRD analysis confirms the formation of ferrites successfully. When the doping level increased, the grain dimension (D) initially reduced and then increased. Similarly, the lattice constants ‘a’ and ‘c’ decreased initially and then increased. The findings indicated that the (Mr/Ms) ratio decreased initially as the doping content increased, but at higher doping ranges, it started to rise. At the same time, coercivity (Hc) and magneto-crystalline an-isotropy field (Ha) increased as the doping level increased. Excellent magnetic characteristics were obtained for BaFe11.5-xAl0.5CoxO19 hexaferrites at doping content of (x=1.5), with magnetic moment 10.80µB, saturation magnetization 57.35 emu/g, and coercivity 5.21 kOe along anisotropic applied field of 1.62 kOe. The findings mentioned above imply that magnetic characteristics of M-type Barium hexaferrites can be significantly improved upon doping of Cobalt against Aluminium substituted hexaferrite, which will make such types of Ba-hexaferrite very useful in many applications, for example, in magnetic filters, memory devices, and recording media, etc.

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Section: Structural Investigationsupporting

confidence: 87%

Effect of ferromagnetic cobalt on characteristics of coercive Aluminium substituted BaFe_11.5Al_0.5O₁₉ hexaferrites

Ijaz,

Asif,

El-Zahhar

et al. 2023

Phys. Scr.

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“…It might be caused by spreading peaks when the Al 3+ concentration rises. The correlation The above behaviour is in line with the assumptions as a higher doping content makes the material denser and less void-filled [45]. Consequently, these facts make clear that how doping level affects the porosity and structure of ceramic materials.…”

Section: Xrd Investigationsupporting

confidence: 78%

Microstructural, morphological and magnetic behaviour of Al³⁺ replaced BaFe_11.5Co_0.5O₁₉ hexaferrites synthesized via sol-gel auto combustion route

Ijaz,

Asif,

Solre

et al. 2024

Phys. Scr.

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In this work, polycrystalline BaFe11.5-xAlxCo0.5O19 (0≤x≤2) hexaferrite samples were synthesised by means of the sol-gel technique. Thereafter, the magnetic and structural properties are thoroughly examined. Cell refinement and XRD examination verified a magnetoplumbite hexaferrite arrangement with a space group of P63/mmc for each sample. The parameters 'a' and 'c' in the lattice fall in value from 5.885 Å to 5.875 Å and from 23.117 Å to 23.049 Å, respectively. Both the average crystallite size and the unit cell volume exhibit a declining trend as the doping level increases. For M-type hexaferrites, the optimal range of c/a values is determined to be 3.923-3.928. The refining process quality was confirmed by the fit good-ness (χ2) values, which fall within the range of 1.079-1.094. X-ray density (dx) and bulk density (db) decline with rising doping contents until x=1.5 doping content, at which point they exhibit an increasing trend. The results showed that as the doping amount increased, the saturation and remanence magnetizations decreased. Coercivity and magnetocrystalline anisotropy are rising together. Both the anisotropy field (Ha) and the anisotropy parameter (B) exhibit a rising trend with doping content. Coercivity of 5.896 kOe, anisotropic applied field of 1.84 kOe, saturation magnetization of 42.68 emu/g, remanence magnetization of 24.414 (emu/g), and magnetic moment per formula unit-(mB) of 11.19µB are the best magnetic properties obtained for the BaFe10Al1.5Co0.5O19 sample.

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“…The lower band (ν2), typically found in the 450–385 cm –1 range, arises from metal–oxygen vibrations within the octahedral sites. − The vibrational frequencies of IR bands ν1 and ν2 of the sample prepared centered around 470 and 600 cm –1 are closely aligned with the range. The peak at ∼1127 cm –1 is related to the stretching vibration of absorbed CO 2 from the atmosphere. , Additionally, the spectra reveal distinct bands around 3400 and 1640 cm –1 , attributed to stretching modes and H–O–H bending vibrations of free or absorbed water, thereby confirming the water absorption …”

Section: Resultsmentioning

confidence: 59%

Time-Dependent Impedance Spectroscopy to Unravel Non-cyclability and Current Fading in Hydroelectric Cells

Jakhar,

Yadav,

Saini

et al. 2024

ACS Appl. Energy Mater.

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In addressing the energy crisis, a strategic emphasis on green energy generation is essential, with water dissociation-based cells named hydroelectric cells (HECs) playing a pivotal role in sustainable production. The multifunctionality of HECs, such as the capability of generating both green and clean energy alongside hydrogen, underscores their significance. In this work, the composite material of exfoliated graphite and lithium−nickel ferrite is utilized in these cells, and a maximum short circuit current density of 14.65 mA/cm 2 with an off-load power density of 2.17 mW/cm 2 is achieved, which is suitable for low power applications. However, in the longer run, we observed the current fading behavior. To unravel the potential electrochemical processes involved in this current fading over the operational lifespan of HECs, we utilized time-dependent electrochemical impedance spectroscopy. By observing electrochemical processes at different aging times over which the current is decaying, it was found that water dissociation resistance and charge transfer resistance increase with time. The former is attributed to the reduction in oxygen vacant sites, and the latter is due to the electrode fouling caused by the formation of the Zn(OH) 2 layer at the Zn electrode. In the face of escalating R ct , the persistent stability of Warburg impedance throughout the cell's lifespan indicates a consistent diffusion process and the availability of unutilized ions in the system. Exploring and mitigating these intricacies promises to utilize available ions, thereby enhancing both these cells' overall efficiency and longevity. Thus, we recommend measuring time-dependent impedance spectra over HEC's lifespan to understand better the different degradation mechanisms responsible for rapid current fading.

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Study of microstructural, ferroelectric and magnetic properties of cerium substituted magnesium ferrite and its potential application as hydroelectric cell

Cited by 22 publications

References 61 publications

Effect of ferromagnetic cobalt on characteristics of coercive Aluminium substituted BaFe_11.5Al_0.5O₁₉ hexaferrites

Effect of ferromagnetic cobalt on characteristics of coercive Aluminium substituted BaFe_11.5Al_0.5O₁₉ hexaferrites

Microstructural, morphological and magnetic behaviour of Al³⁺ replaced BaFe_11.5Co_0.5O₁₉ hexaferrites synthesized via sol-gel auto combustion route

Time-Dependent Impedance Spectroscopy to Unravel Non-cyclability and Current Fading in Hydroelectric Cells

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Study of microstructural, ferroelectric and magnetic properties of cerium substituted magnesium ferrite and its potential application as hydroelectric cell

Cited by 22 publications

References 61 publications

Effect of ferromagnetic cobalt on characteristics of coercive Aluminium substituted BaFe11.5Al0.5O19 hexaferrites

Effect of ferromagnetic cobalt on characteristics of coercive Aluminium substituted BaFe11.5Al0.5O19 hexaferrites

Microstructural, morphological and magnetic behaviour of Al3+ replaced BaFe11.5Co0.5O19 hexaferrites synthesized via sol-gel auto combustion route

Time-Dependent Impedance Spectroscopy to Unravel Non-cyclability and Current Fading in Hydroelectric Cells

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Effect of ferromagnetic cobalt on characteristics of coercive Aluminium substituted BaFe_11.5Al_0.5O₁₉ hexaferrites

Effect of ferromagnetic cobalt on characteristics of coercive Aluminium substituted BaFe_11.5Al_0.5O₁₉ hexaferrites

Microstructural, morphological and magnetic behaviour of Al³⁺ replaced BaFe_11.5Co_0.5O₁₉ hexaferrites synthesized via sol-gel auto combustion route