D.C. resistivity of Cr3+ substituted lithium ferrites

Gill, Navdeep K.; Puri, R. K.

doi:10.1007/bf00719727

Cited by 26 publications

(12 citation statements)

References 7 publications

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“…2a, where a exp À a th Da 0X004 nm at x 0 and Da 0X002 nm at x 1. This discrepancy can be attributed to the deviation from the formula of cation distribution (2). This deviation is related to the presence of divalent iron ions Fe 2 which was realized by IR spectra analysis [15].…”

Section: X-ray Analysismentioning

confidence: 99%

Structure and Magnetic Properties of Li–Cu Ferrite

Mazen¹,

Dawoud²

1999

phys. stat. sol. (a)

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X-ray diffraction was used to study the formation and structure of mixed ferrite Li 0X5À0X5x Cu x ± Fe 2X5À0X5x O 4 (where x 0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1.0). The X-ray diffraction pattern proved that the prepared samples were formed in the spinel structure. The samples with x 0X7 have cubic structure while the samples with x 0X9, 1 have tetragonal structure. The experimental and theoretical lattice parameters a exp and a th ) were calculated for each composition. A comparison study between experimental and theoretical values was performed. The initial permeability m i was measured as a function of temperature for the above-investigated ferrite. Utilizing the initial permeability data, the Curie temperature T C was determined. T C was found to decrease with increasing Cu 2 ion content. The anomaly seen in the temperature dependence of m i was attributed to the existence of two structural phases (cubic and tetragonal phase). The magnetization M was measured at room temperature in the range of magnetizing field from 0 to 1307 Am À1 . The calculated relative permeability showed a dependence on the magnetizing field and composition. In addition, the B H loop was measured at room temperature and at constant magnetizing field H 350 Am À1 . The coercive force H c , remanence induction B r and the apparent loss energy P s were estimated. It has been found that both B r and P s are composition dependent while H c is independent of composition.

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Section: X-ray Analysismentioning

confidence: 99%

Structure and Magnetic Properties of Li–Cu Ferrite

Mazen¹,

Dawoud²

1999

phys. stat. sol. (a)

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“…A super structured form in which lithium and iron atoms are ordered is called α-LiFe 5 O 8 and has a subgroup of Fd-3m with a primitive cubic unit cell (space group P4 3 3 or P4 1 3, a = 8.3372 Å) [5]. They are based on the inverse spinel structure with lithium and three fifth of the total Fe 3+ occupying octahedral sites [6]. However, disordered form of lithium ferrites has a random statistical distribution of lithium and iron over all the octahedral positions [7].…”

Section: Introductionmentioning

confidence: 99%

Cation Distribution in Lithium Ferrite (LiFe5O8) Prepared via Aerosol Route

Singhal¹,

Chandra²

2010

JEMAA

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“…On the other hand, in the samples sintered at 1150 and 1200°C, the dispersion at a low-frequency range can be interpreted by Koop's theory, 45 which suggests the heterogeneous structure of the sample. This is based on the Maxwell-Wagner model for the inhomogeneous double layer dielectric structure, which considers that the ferrite grain boundary structures with less electrical conductivity were established to be active in a lower frequency range while ferrite grains that contribute to the conductivity are active at a high-frequency range.…”

Section: Resultsmentioning

confidence: 99%

Effect of the CoFe₂O₄ initial particle size when sintered by microwave on the microstructural, dielectric, and magnetic properties

Perdomo

Zabotto

Garcia

et al. 2019

Int J Applied Ceramic Tech

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The particle size of CoFe2O4 powders (average particle size of 350 nm) was reduced to 50 nm by high‐energy milling. In this paper, special attention was given for analyzing the densification and grain growth of both particle sizes (350 and 50 nm) subject to ultrafast sintering assays using microwave sintering and their effect on the magnetic and electric properties. The results indicated that the grain growth was 10 times higher for the nanoparticle system, reaching similar sizes of ~1 μm in both cases after sintering. The relative density values were higher (95%) in the nanoparticle system due to the wide distribution of particle sizes generated in the grinding process. Qualitatively inferred microscopy analysis showed high sinterability of fine particles with a narrow distribution of grain size when subjected to ultrafast firing processes. Magnetization measurements at room temperature clearly show the reduction of Hc with increasing grain size. Electric resistivity, dielectric constant (ε′), and dielectric loss tangent (tan δ) were measured as a function of frequency at room temperature. The low values of dielectric constant (ε′) and dielectric loss (tan δ) in the low frequency range, shown for all samples sintered by microwave, prove the excellent uniformity in the microstructure.

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D.C. resistivity of Cr3+ substituted lithium ferrites

Cited by 26 publications

References 7 publications

Structure and Magnetic Properties of Li–Cu Ferrite

Structure and Magnetic Properties of Li–Cu Ferrite

Cation Distribution in Lithium Ferrite (LiFe5O8) Prepared via Aerosol Route

Effect of the CoFe₂O₄ initial particle size when sintered by microwave on the microstructural, dielectric, and magnetic properties

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D.C. resistivity of Cr3+ substituted lithium ferrites

Cited by 26 publications

References 7 publications

Structure and Magnetic Properties of Li–Cu Ferrite

Structure and Magnetic Properties of Li–Cu Ferrite

Cation Distribution in Lithium Ferrite (LiFe5O8) Prepared via Aerosol Route

Effect of the CoFe2O4 initial particle size when sintered by microwave on the microstructural, dielectric, and magnetic properties

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Product

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Effect of the CoFe₂O₄ initial particle size when sintered by microwave on the microstructural, dielectric, and magnetic properties