HYSTERESIS AND ELECTRIC MODULUS ANALYSIS OF Y³⁺ DOPED MnNi-Y-TYPE HEXAGONAL FERRITE

“…11 (b). A broad peak is observed for all concentration indicating the existence of relaxation mechanism for the hexagonal ferrites [41]. The frequencies representing maximum peak are responsible for the mobility of charge carriers.…”

Section: Frequency Dependent Dielectric Propertiesmentioning

confidence: 84%

Structural, Magnetic and Dielectric Properties of Aluminum Cobalt Substituted M-type Strontium Hexaferrites

Singh

Jotania

Chauhan

2018

Magnetic Oxides and Composites

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SrCo x Al x Fe (12-2x) O 19 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) hexaferrites have been synthesized using a simple heat treatment method and characterized using various instrumental techniques such as FTIR, XRD, SEM, VSM and dielectric measurements. The XRD analysis reveals the formation of mixed phases of M-type hexaferrite and α-Fe 2 O 3 . The crystallite size is found in the range of 24-46 nm. The micrographs of typical samples show porous and agglomerated grains. The values of M s , M r , H c decreased with the increase of Co-Al content. The values of the dielectric constant, tangent loss, AC conductivity and dielectric modulus were studied as a function of frequency.

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“…The change from long-range to short-range order in mobility and relaxation time dispersion may be seen in the frequency band beneath the asymmetrical peaks. Carrier inhomogeneity due to crystalline defects causes this transition, which points to an interaction mechanism other than the Debye type and ionic contacts [49].…”

Section: Electric Modulus Analysismentioning

confidence: 93%

“…Two overlapping semicircles make up the impedance in a Cole-Cole distribution based on a two-layer model. The low frequency semicircle represents the grain boundary resistance, whereas the high frequency semicircle indicates the grain or bulk property resistance[49][50][51]. The distribution of relaxation times is linked to this phenomenon.…”

mentioning

confidence: 99%

Physical Interpretation of the morphology in the relaxation mechanism of Ba Hexagonal Nano-Ferrites (BaCoxCdxFe12-2xO19): Impedance Modelling, AC conductivity, dielectric modulus, and electrical modulus parameters

Singh

Jain

Godara

et al. 2023

Preprint

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This study describes in detail the sol-gel synthesis of doped M-type Ba hexagonal ferrite with Co2+ and Cd2+. In order to explore the crystal structure and grain morphology, X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) have been used. At room temperature, the dielectric, impedance, electric modulus, and conductivity characteristics were investigated using an impedance analyzer, as well as the physical interpretation of morphology in the relaxation mechanism. The structural parameters indicated the formation of hexagonal M-type crystal structures. Doping with large quantities of Co2+ or Cd2+ caused the unit cell to become smaller, which in turn reduced the lattice constants to lower values. The examination of grain morphology revealed that the doping led to the formation of needle-like grains. The change of AC conductivity from 0.00022 to 1.04*10− 7 Ωm− 1 with frequencies ranging from 1 KHz to 2 MHz demonstrated that the electron hopping process was the primary cause of the high electrical conductivity in these ferrites. As a function of doping, the dielectric spectrum analysis showed that there was a decrease in the dielectric constant and an increase in the loss tangent. Within the frequency range of 1 KHz to 2 MHz, the fluctuation of the dielectric constant (ε′) from 135.94 to 3.59 and the loss tangent (tan σ) from 3.67 to 0.11 was observed. The relaxation of conductivity was seen for different levels of composition, which correlated with the non-Debye type of behaviour proven by the electric modulus spectra. Both relaxation time and AC conductivity decreased with doping. The conductivity relaxation and dielectric relaxation contributed to the charge transport mechanism in the BaCoxCdxFe12−2xO19. Electrochemical impedance spectroscopy software resulted in impedance curves that corresponded with empirically measured impedance values. There was consistency between the calculated grain and grain boundary characteristics as well as the distribution of grains /grain boundaries observed in the micrographs.

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HYSTERESIS AND ELECTRIC MODULUS ANALYSIS OF Y³⁺ DOPED MnNi-Y-TYPE HEXAGONAL FERRITE

Cited by 18 publications

References 36 publications

Investigation of structural, magnetic and dielectric properties of gallium substituted Z-type Sr3Co2-Ga Fe24O41 hexaferrites for microwave absorbers

Investigation of structural, magnetic and dielectric properties of gallium substituted Z-type Sr3Co2-Ga Fe24O41 hexaferrites for microwave absorbers

Structural, Magnetic and Dielectric Properties of Aluminum Cobalt Substituted M-type Strontium Hexaferrites

Physical Interpretation of the morphology in the relaxation mechanism of Ba Hexagonal Nano-Ferrites (BaCoxCdxFe12-2xO19): Impedance Modelling, AC conductivity, dielectric modulus, and electrical modulus parameters

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