Electrical properties and positron annihilation studies for LaxCoFe2−xO4

Salem, B. I.; Hemeda, O. M.; Mansour, S.F.; Hamad, Mahmoud A.

doi:10.1007/s00339-018-2029-z

Cited by 11 publications

(3 citation statements)

References 37 publications

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“…Each range starts from one specific temperature up to another specific temperature, depending on Al content. As is normal dielectric behavior for magnetic semiconductor ferrites, ε′ increases as temperature increases, as was earlier observed for La-Co [2] and Ni-Cd-Al [38] ferrites.…”

Section: Dielectric Propertiessupporting

confidence: 73%

“…The very low conductivity of these materials makes them useful for microwave applications. As low conductive materials, ferrites have a level of conductivity that significantly affects their dielectric and magnetic behavior: this has produced considerable interest in their frequency-dependent dielectric behavior and electrical conductivity [2,3]. Nanoparticles can be synthesized using many organic solvents and can be retrieved as powder forms by removing the solvent.…”

Section: Introductionmentioning

confidence: 99%

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The influence of aluminum’s crystalline structure on the elastic, dielectric, and electrical properties of Ni ferrite

Arrasheed¹,

Alibwaini²,

Meaz³

et al. 2022

Phys. Scr.

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The authors investigate the effect of Al on the structural, elastic, and electrical properties of a Ni nano ferrite. Six samples of NiAlxFe2-xO4 (where x= 0.00, 0.20, 0.40, 0.60, 0.80, and 1.00) were synthesized using flash auto combustion. As shown in XRD patterns, the lattice appears as a Fd-3m space group, a single-phase spinel structure with average crystallite size ranging from 22.4 - 24.7 nm for all samples. SEM and TEM images showed a uniform and spherical structural with a narrow size distribution. The results manifest significant changes in the elastic and electrical properties due to the presence of Al. As Al content increased, the bulk B, shear G, and Young E moduli decreased and remained in the same order of hundreds in the GPa range: however, the values of the Debye temperature θD increased. The dielectric parameters ε′, ε″, and tan δ decreased as the frequency of the applied field and Al content increased: they also decreased as temperature increased. The relaxation times were τ_ε=τ_tanδ=0.1959 μs for all samples. The electric moduli M′ and M″ increased as the frequency of the applied field and Al content increased, but they decreased as temperature increased. The relaxation times are dispersed depending on Al content, frequency, and temperature. The Cole-Cole curve showed two semicircles corresponding to the grain and grain boundary with the electrical relaxation of the non-Debye form. The electric impedance Z′ and Z″ increased as the frequency of the applied field and temperature increased, although they decreased as Al content increased. These results indicate that Ni-Al ferrite has respectable dielectric properties, which opens the door for many applications in control and safety monitoring tools, where dynamic process temperature sensors are of great importance and the temperature dependency of the material is significant.

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Section: Dielectric Propertiessupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

The influence of aluminum’s crystalline structure on the elastic, dielectric, and electrical properties of Ni ferrite

Arrasheed¹,

Alibwaini²,

Meaz³

et al. 2022

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…In recent years, the ferrites have been known as great practical materials as well as the special class of magnetic compounds [1][2][3][4][5][6][7][8][9][10]. Because of their significant dielectric, magnetic properties, they are used in wide ranges of applications at different fields of technology (energy, refrigeration, and health) [11][12][13][14][15][16][17][18][19]. CoFe 2 O 4 is one of the important types of ferrites which exhibit remarkable properties, such as good mechanical hardness, chemical stability and high magnetostriction, with high saturation magnetization, high coercivity and high anisotropy [20,21].…”

Section: Introductionmentioning

confidence: 99%

The role of flash auto-combustion method and Mn doping in improving dielectric and magnetic properties of CoFe2O4

et al. 2020

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In this work, we prepared Co 1-x Mn x Fe 2 O 4 (CMFO) ferrites at different levels of doping x = 0.0, 0.1, 0.3, 0.5 and 0.7 using flash auto-combustion method, aiming to obtain promising results more than CoFe 2 O 4 ferrite prepared by other methods. The results show an increase in lattice constant of CMFO with Mn content. In addition, there are many intra-granular pores and significant fusion of the small grains into larger grains. The dielectric properties of CMFO ferrites are enhanced with Mn content. Furthermore, saturation magnetization (M S ) and remanent magnetization (M r ) of CMFO are improved slightly with Mn content up to x = 0.1 and then decrease with higher Mn content. The coercivity (H C ) of CMFO ferrite decreases with Mn content until it reaches minimum value of 971 Oe for level of Mn substitution x = 0.5; on further Mn content (X = 0.7), it is observed that H c increases to 1249 Oe. In comparison to previous works, H C (x = 0) and M S and M r for our sample (x = 0.1) are significantly more than corresponding values obtained for CoFe 2 O 4 ferrite prepared by other methods.

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The dielectric and magnetic properties of RTV-silicon rubber Ni–Cr ferrite composites

et al. 2020

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Electrical properties and positron annihilation studies for LaxCoFe2−xO4

Cited by 11 publications

References 37 publications

The influence of aluminum’s crystalline structure on the elastic, dielectric, and electrical properties of Ni ferrite

The influence of aluminum’s crystalline structure on the elastic, dielectric, and electrical properties of Ni ferrite

The role of flash auto-combustion method and Mn doping in improving dielectric and magnetic properties of CoFe2O4

The dielectric and magnetic properties of RTV-silicon rubber Ni–Cr ferrite composites

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