Effect of Dy3+ substitution on structural and magnetodielectric properties of Mn–Zn ferrites synthesized by microwave hydrothermal method

Neelima, P.; Usha, P.; Ramesh, T.; Ganta, Kiran Kumar

doi:10.1007/s10854-023-10189-0

Cited by 9 publications

(3 citation statements)

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“…Beyond 500 ºC, there is no significant weight loss observed which indicates the powder's thermal stability. Several scientific papers report similar results in rare earth ferrites, and the weight losses are found to be dependent on the synthesis method (Neelima, 2023). Two different mass changes were observed in the TGA graph of the sample prepared at 120 min.…”

Section: Resultssupporting

confidence: 52%

Multifunctional dysprosium iron oxide nanoparticles: synthesis and properties

Gul,

Beyaz

2024

Preprint

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This paper presents a fast and cost-effective synthesis method for obtaining nano scaled multifunctional dysprosium iron oxide. The effects of reaction time and stirring rate on the compound's chemical and physical properties are investigated as synthesis parameters. The structural, morphological, thermal, magnetic, and optical characterizations of the compound are extensively investigated by current universal instruments. It was found in an orthorhombic system as DyFeO3 (ICSD = 98-028-0091). Their particle sizes were calculated as 7–10 nm by transmitting electron microscopy. Vibration sample magnetometer was used to obtain M-H curves that showed superparamagnetic properties in low magnetic fields. The band gap value was calculated 3.6 eV for the sample preparing at 30 min by McClean analysis using reflectance graphics. The fluorescence spectroscopy indicated a sharp transition at 4F9/2→ 6H13/2 which confirms the Dy3+ ion acting as luminescence center. Additionally, the nanoparticles exhibited a remarkably high microbial activity against both gram-positive and gram-negative bacteria. These comprehensive characterizations contribute to a better understanding of the synthesized nanomaterials and its use of their biomedical potential applications.

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Section: Resultssupporting

confidence: 52%

Multifunctional dysprosium iron oxide nanoparticles: synthesis and properties

Gul,

Beyaz

2024

Preprint

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“…The low cost of required equipment and the simple steps of the sol-gel auto-combustion method attract people to prepare ferrite nanoparticles. [23][24][25] On the other hand, Ramesh et al 26,27 prepared the garnet samples using techniques like microwave hydrothermal and microwave sintering. They successfully reduced the formation temperature to around 300 °C, and the time was reduced to one-twentieth.…”

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confidence: 99%

Tunable Magnetic and Dielectric Properties of BaMg_0.4Al_0.4Fe_11.2O₁₉ and SiO₂ Composites for High-Frequency Applications

Ramesh,

Ashok,

Usha

et al. 2024

ECS J. Solid State Sci. Technol.

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This study focuses on the synthesis and characterization of Mg and Al co-doped M-type Barium hexaferrite (BaMg0.4Al0.4Fe11.2O19) powder via the sol-gel method. Structural analysis using X-ray diffraction (XRD) and Fourier transformation infrared spectroscopy (FTIR) confirmed the single-phase structure of the synthesized powder. Morphological properties were examined through field emission scanning electron microscopy (FESEM), revealing hexagonal particle morphology with an average size of approximately 60 nm for BaMg0.4Al0.4Fe11.2O19. To fabricate composites, commercially purchased SiO2 was used to prepare the composites of (1–x) BaMg0.4Al0.4Fe11.2O19+ (x) SiO2 {where x = 0.0, 0.1, 0.3, 0.5 and 0.7). The composites were prepared using the mixing method followed by microwave sintered at 1000°C/90 min. FESEM and energy-dispersive X-ray spectroscopy (EDS) were employed to analyze the morphology and elemental composition of the composites. The composites ' frequency-dependent complex permittivity was measured over 300 kHz to 3 GHz. Magnetic hysteresis (M-H) loops were used to analyze the magnetic properties of composite samples. A reduction in magnetic saturation was observed with increasing SiO2 concentration, while there was a slight increase in coercivity for the composite samples compared to pure hexaferrite. Coercivity remained relatively unchanged with varying SiO2 concentrations in the composites.

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“…Moreover, other researchers have observed the change in ferrites' structural, magnetic, electrical, and dielectric properties with the rare Earth elements substitution. 18,19 As discussed earlier, ferrite properties are highly sensitive to their structure and the distribution of atoms among A and B sites, so the preparation method used to synthesize them plays a crucial role in obtaining the best possible properties for a given application. Therefore, several novel synthesis techniques have been developed to produce ferrite nanoparticles with optimized properties.…”

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confidence: 99%

Impact of Process Parameters and Dopant Concentration on Structural, Magnetic, and Dielectric Properties of Dysprosium-doped Nickel-Zinc Ferrites Synthesized by Microwave Hydrothermal Method

Ramesh,

Usha,

Neelima

et al. 2023

ECS J. Solid State Sci. Technol.

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This study aims to investigate the impact of substituting Dy3+ ions on the structural, magnetic and dielectric properties of Nickel Zinc (Ni-Zn) ferrites, which have the chemical formula Ni0.5Zn0.5DyxFe2-xO4 (where x = 0, 0.01, 0.03, 0.05, 0.07, and 0.09). These ferrites were synthesized using a microwave hydrothermal technique with different process parameters. Structural characterization of the synthesized powders was carried out using X-ray diffraction (XRD) and Fourier transformation infrared spectroscopy (FTIR). The XRD analysis confirmed the presence of a pure spinel phase for Dy concentrations (x) up to 0.05. However, when x ≥ 0.07, an additional orthoferrite phase (DyFeO3) was observed along with the spinel phase. FTIR spectra revealed a shift in low-frequency wave numbers due to Dy3+ ion substitution. The size and morphology of the synthesized powder particles were examined using field emission scanning electron microscopy (FESEM). The powder compacts were sintered using microwave processing at 900 °C for 40 min. The increase in dc. resistivity is observed with an increase in Dy3+ concentration, mainly due to the change in the hopping mechanism with the substitution concentration. Dielectric properties such as dielectric constant and loss are measured in the frequency range of 100 Hz to 1.8 GHz. The high value of dielectric constant and loss observed in the low-frequency region compared to the high-frequency region. Maxwell’s Wagner model and ‘Koop’s theory explains the variation in dielectric properties with the frequency. The magnetic hysteresis loops were measured at different temperatures and observed to enhance the low-temperature magnetic properties compared to room temperature. The results suggest that the magnetic and dielectric properties of the investigated samples can be adjusted by varying the concentration of Dy3+ ions, providing the ability to tailor these properties according to specific application requirements.

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Effect of Dy3+ substitution on structural and magnetodielectric properties of Mn–Zn ferrites synthesized by microwave hydrothermal method

Cited by 9 publications

References 50 publications

Multifunctional dysprosium iron oxide nanoparticles: synthesis and properties

Multifunctional dysprosium iron oxide nanoparticles: synthesis and properties

Tunable Magnetic and Dielectric Properties of BaMg_0.4Al_0.4Fe_11.2O₁₉ and SiO₂ Composites for High-Frequency Applications

Impact of Process Parameters and Dopant Concentration on Structural, Magnetic, and Dielectric Properties of Dysprosium-doped Nickel-Zinc Ferrites Synthesized by Microwave Hydrothermal Method

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Effect of Dy3+ substitution on structural and magnetodielectric properties of Mn–Zn ferrites synthesized by microwave hydrothermal method

Cited by 9 publications

References 50 publications

Multifunctional dysprosium iron oxide nanoparticles: synthesis and properties

Multifunctional dysprosium iron oxide nanoparticles: synthesis and properties

Tunable Magnetic and Dielectric Properties of BaMg0.4Al0.4Fe11.2O19 and SiO2 Composites for High-Frequency Applications

Impact of Process Parameters and Dopant Concentration on Structural, Magnetic, and Dielectric Properties of Dysprosium-doped Nickel-Zinc Ferrites Synthesized by Microwave Hydrothermal Method

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Tunable Magnetic and Dielectric Properties of BaMg_0.4Al_0.4Fe_11.2O₁₉ and SiO₂ Composites for High-Frequency Applications