Investigations of calcium ferrite nanoparticles synthesized by sol-gel auto combustion and solution mixture methods

Jani, Parth; Desai, Harshal B.; Madhukar, B. S.; Tanna, Ashish R.

doi:10.1080/14328917.2021.1932318

Cited by 18 publications

(8 citation statements)

References 27 publications

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“…It can be observed from table 5 that the value of energy gap has been decreased as the concentration of Cu 2+ ions has got increased from the 0% to 8%. The similar values of energy bandgap (around 2 eV) has been also reported by Jani et al for the spinel ferrites, and this result is helpful for achieving good photocatalytic application [29]. The variation in energy gap can be understood on the basis of crystallite size and lattice strain of the prepared Cu/Y co-substituted cobalt ferrites.…”

Section: Uv-visible Spectroscopysupporting

confidence: 83%

“…The variation between (F(R)hυ) 2 and hυ for five different doped compositions of copper in YCFO has been shown in figure 8(b). The reflectance pattern of the Y-Cu co-doped CFO has been studied elaboratively by employing well established as well as modified Kubelka-Munk function as given by equation (2) [28,29]. This function provides the direct relation between reflectance and energy gap as follows: where, F(R) represents the Kubelka Munk function and R represents the reflectance To calculate the value of the bandgap using reflectance spectra, a graph has been plotted between (F(R)hυ) 2 and energy (hυ) for Cu (0%, 2%, 4%, 6%, 8%) doped YCFO samples as shown in figure 8(b).…”

Section: Uv-visible Spectroscopymentioning

confidence: 99%

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Advancements in multiferroic, dielectric, and impedance properties of copper–yttrium co-doped cobalt ferrite for hydroelectric cell applications

Jain,

Shankar,

Thakur

2024

J. Phys.: Condens. Matter

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This paper explores yttrium and copper co-doped cobalt ferrite [Co1-xCuxFe1.85Y0.15O4] synthesized via the sol-gel auto combustion route (0.0 ≤ x ≤ 0.08). Investigating the impact of co-dopants on CoFe2O4, the study reveals altered cation distribution affecting structure, multiferroic, and electrical properties. XRD studies show nanocrystalline co-doped cobalt ferrites with lattice expansion and smaller grains due to Cu-Y co-doping. FTIR confirms inverse spinel family classification with tetrahedral lattice shrinkage. FESEM indicates a grain size of approximately 0.12 μm. Ferroelectric analysis reveals a peak saturation polarization of 23.42 μC/cm2 for 8% copper doping, attributed to increased Fe3+ ions at tetrahedral sites. Saturation magnetization peaks at 54.4706 emu/g for 2% Cu2+ ion substitution [Co0.98Cu0.02Fe1.85Y0.15O4] and decreases to 37.09 emu/g for 4% Cu substitution due to irregular iron atom distribution at tetrahedral sites. Dielectric studies uncover Maxwell-Wagner Polarization and high resistance in grain and grain boundaries using Impedance Spectroscopy. Fabricated hydroelectric cells exhibit improved ionic diffusion, suggesting potential applications.

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Section: Uv-visible Spectroscopysupporting

confidence: 83%

Section: Uv-visible Spectroscopymentioning

confidence: 99%

Advancements in multiferroic, dielectric, and impedance properties of copper–yttrium co-doped cobalt ferrite for hydroelectric cell applications

Jain,

Shankar,

Thakur

2024

J. Phys.: Condens. Matter

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“…8. The intersection point on the energy axis of linear fitting from the Tauc equation, 47,48,49 as shown in the inset of Fig. 8, results in the optical energy bandgap values.…”

Section: Uv-visible Diffuse Reflectance Spectroscopy (Uv-vis-drs)mentioning

confidence: 99%

Investigation of the Structural and Optical Properties of Zinc Ferrite Nanoparticles Synthesized via a Green Route

Jogi

Singhal

Jangir

et al. 2022

J. Electron. Mater.

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We report herein the synthesis of ZnFe 2 O 4 (ZF) nanoparticles via a simple and eco-friendly green route using lemon juice as a reducing agent and fuel. The effect of different calcination temperatures on the particle size and bandgap of grown ZF nanoparticles was investigated. The structural, morphological and optical properties of the synthesized nanoparticles were evaluated using synchrotron x-ray diffraction (S-XRD), field emission scanning electron microscopy (FE-SEM) and UV-visible diffuse reflectance spectroscopy (UV-Vis-DRS), respectively. S-XRD confirmed a spinel F-d3m phase in all four samples calcined at 350°C, 550°C, 750°C and 1000°C. The crystallite size calculated from the Debye–Scherrer equation showed an increase from 14 nm to 20 nm with the increase in calcination temperature. Williamson–Hall (W-H) analysis revealed an increase in the particle size from 16 nm to 21 nm and a decrease in the lattice microstrain from 0.913 × 10 −3 to 0.154 × 10 −4 with the increase in calcination temperature. The optical bandgap of the ZF nanoparticles obtained from UV-Vis-DRS decreased from 2.265 eV to 2.225 eV with the increase in calcination temperature. The ZF nanoparticles with tunable particle size, lattice microstrain and optical bandgap have potential application in ferrofluid, electromagnetic shielding, photocatalysis, hyperthermia, dye degradation and other areas. Supplementary Information The online version contains supplementary material available at 10.1007/s11664-022-09813-2.

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“…[5] Brownmillerite materials belong to the family of perovskiterelated compounds and possess the chemical formula A 2 B 2 O 5 . [6] The mineral with the chemical formula Ca 2 (Al,Fe) 2 O 5 is a scarcely occurring oxide and was named after Lorrin Thomas Brownmiller (1902Brownmiller ( -1990, who served as the chief chemist for the Alpha Portland Cement Company in Easton, Pennsylvania. The perovskite structure (ABO 2.5 ) lacking oxygen atoms is characterized by a three-dimensional framework composed of BO 6 octahedra sharing corners, interspersed with slabs containing rows of BO 4 tetrahedra sharing corners.…”

Section: Introductionmentioning

confidence: 99%

“…Brownmillerite materials belong to the family of perovskite‐related compounds and possess the chemical formula A 2 B 2 O 5 [6] . The mineral with the chemical formula Ca 2 (Al,Fe) 2 O 5 is a scarcely occurring oxide and was named after Lorrin Thomas Brownmiller (1902–1990), who served as the chief chemist for the Alpha Portland Cement Company in Easton, Pennsylvania.…”

Section: Introductionmentioning

confidence: 99%

Brownmillerite Calcium Ferrite, a Promising Perovskite‐Related Material in the Degradation of a Tight Dye under Ambient Conditions

Noori,

Malekzadeh,

Poater

2023

ChemistryOpen

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Evaluation of effective and low‐cost materials as catalysts to combat the threat of pollution is a significant and growing trend. With this aim, we have synthesized calcium ferrite brownmillerite by wet preparation approach as a catalyst for pollution. The structural analysis is established by the X‐ray diffraction of Ca2Fe2O5, whereas the tetrahedral and octahedral sites band stretching for ferrite specimen has been deduced using FTIR. The bandgap energy has been estimated by the Tauc relation (2.17 eV). Ca2Fe2O5 brownmillerite exhibits a BET surface area of 10 m2/g and a BJH pore volume of 0.121 cm3/g with the average particle size of 70 nm. Importantly, the alizarin Red S dye degradation has been studied using the prepared ferrite catalyst, under dark ambient conditions and without the presence of any acidic or basic additives. Degradation is also supported by both FTIR and TOC analysis. Surface properties of brownmillerite Ca2Fe2O5 have been characterized using electronic spectroscopy and CO2 temperature programmed desorption (TPD) analysis and revealed that the basic surface of brownmillerite Ca2Fe2O5 offers active sites that are suitable for degradation processes. All results show that the preparation of brownmillerite Ca2Fe2O5 via the Pechini method is suitable to produce fine surfaces and pores with nanosized particles.

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Investigations of calcium ferrite nanoparticles synthesized by sol-gel auto combustion and solution mixture methods

Cited by 18 publications

References 27 publications

Advancements in multiferroic, dielectric, and impedance properties of copper–yttrium co-doped cobalt ferrite for hydroelectric cell applications

Advancements in multiferroic, dielectric, and impedance properties of copper–yttrium co-doped cobalt ferrite for hydroelectric cell applications

Investigation of the Structural and Optical Properties of Zinc Ferrite Nanoparticles Synthesized via a Green Route

Brownmillerite Calcium Ferrite, a Promising Perovskite‐Related Material in the Degradation of a Tight Dye under Ambient Conditions

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