Matching Permeability and Permittivity of Ga-Substituting Mg-Cd Ferrites for High-Frequency Antennas

Wang, Pinglu; Zhu, Meng; Zheng, Wanze; Yang, Chao; Xie, Fei; Xiao, Nan; Hou, Bei; Lu, Wei; Jiang, Fuwei

doi:10.1007/s10948-019-05228-z

Cited by 2 publications

(1 citation statement)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several researchers observed a similar kind of complex permittivity behavior for various ferrites. [52][53][54] Figure 12 depicts the temperature variation of the dielectric constant (ε′) of all samples over a temperature range of 30 °C-350 °C at a fixed frequency of 10 KHz. The results show that the dielectric constant of all samples is almost constant at low temperatures and slowly increases with temperature, followed by the occurrence of a peak at a specific temperature called transition temperature (T C ) and then the dielectric constant value decreases with a further temperature increase.…”

Section: Sample (X)mentioning

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.

View full text Add to dashboard Cite

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.

show abstract

Section: Sample (X)mentioning

confidence: 99%