The infrared absorption and dielectric properties of Li–Ga ferrite

Mazen, S. A.; Mansour, S.F.; Dhahri, E.; Zaki, H.M.; Elmosalami, T.A.

doi:10.1016/j.jallcom.2008.02.035

Cited by 103 publications

(42 citation statements)

References 17 publications

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“…Such shoulders have been recorded also for Li 0.5 Fe 2.5 O 4 by many authors [8,24]. These bands are denoted by ν 1(1) , ν 1(2) , and ν * 1 .…”

Section: Ir Spectral Analysismentioning

confidence: 54%

“…It is a wellknown fact that the normal and inverse cubic spinels have four IR absorption bands signifying the four fundamentals (ν a 1 , ν a 2 , ν 3 , and ν 4 ) [21]. The IR spectrum of pure Li-ferrite (x = 0.0) was discussed previously in more detail by our group [8,22]. From Figure 6 it is noticeable that the main absorption bands (ν a 1 and ν a 2 ) have appeared in all series of the investigated ferrite system.…”

Section: Ir Spectral Analysismentioning

confidence: 85%

“…There are many researches that have been reported in the literature on the studies of Li-Zn, Li-Mg, Li-Ti, Li-Cd, Li-Cu, and Li-Ga ferrites [3][4][5][6][7][8]. However, little information is available in the literature regarding the Li-Ni ferrite.…”

Section: Introductionmentioning

confidence: 99%

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Structural and Elastic Properties of Li-Ni Ferrite

Mazen

Elmosalami

2011

ISRN Condensed Matter Physics

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Li-Nickel ferrites with the chemical formula Li 0.5−0.5x Ni x Fe 2.5−0.5x O 4 (0.0 ≤ x ≤ 1.0) have been prepared by the ceramic method. The spinel structure in homogenous state was realized by X-ray diffraction analysis. The lattice parameter has been determined for each composition and found to be nearly constant over the whole range of Ni concentration (= 0.83 nm ± 0.01). The cation distribution for each composition has been suggested. The experimental and theoretical lattice constants were found to be in good agreement with each other confirming the agreeability of the suggested cation distribution. The analysis of IR spectra indicates the presence of splitting in the absorption band due to the presence of small amounts of Fe 2+ ions in the ferrite system. The force constants for tetrahedral and octahedral sites have been determined. Young's modulus (E), rigidity modulus (G), bulk modulus (B), Debye temperature (θ D ), and transverse (V t ) and longitudinal (V l ) wave velocities have been determined. The variation of elastic moduli with composition has been interpreted in terms of binding forces between the atoms of spinal lattice.

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“…Such shoulders have been recorded also for Li 0.5 Fe 2.5 O 4 by many authors [8,24]. These bands are denoted by ν 1(1) , ν 1(2) , and ν * 1 .…”

Section: Ir Spectral Analysismentioning

confidence: 54%

Section: Ir Spectral Analysismentioning

confidence: 85%

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Structural and Elastic Properties of Li-Ni Ferrite

Mazen

Elmosalami

2011

ISRN Condensed Matter Physics

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“…Also, the phonon frequency ν ph for each Li-Mn ferrite was calculated at f = 5 × 10 5 Hz and compared with those calculated from IR spectra [4]. The values of the phonon frequency were tabulated in Table 4.…”

Section: Determination Of Frequency Exponential Factor (S)mentioning

confidence: 99%

“…It can provide us with information for obtaining a high-quality ferrite for particular applications. Modification in electric and magnetic properties of lithium ferrites by substitution of different ions has been extensively studied [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

IR Spectra, Elastic and Dielectric Properties of Li–Mn Ferrite

Mazen

Abu-Elsaad

2012

ISRN Condensed Matter Physics

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Polycrystalline ferrites, Li 0.5-0.5x Mn x Fe 2.5-0.5x O 4 , (where x = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9, and 1.0), were prepared by using ceramic method. Single phase cubic structure was confirmed by X-ray diffractometer. The lattice parameter "a" was found to increase with increasing Mn 2+ ion substitution. IR spectra of the samples were recorded from 200 to 1000 cm −1 . The two primary bands corresponding to tetrahedral υ A and octahedral υ B were observed at about 575 cm −1 and 370 cm −1 , respectively. Elastic properties of these mixed ferrites were estimated as a function of composition. Young's modulus (E), rigidity modulus (G), bulk modulus (B), Debye temperature (θ D ), and mean sound velocity (V m ) were calculated from the transverse (V t ) and longitudinal (V 1 ) wave velocities. The variation of elastic moduli with composition was interpreted in terms of binding forces between the atoms of spinel lattice. AC conductivity σ and dielectric properties of the samples were measured at room temperature over 100 Hz-1 MHz. The electrical conduction mechanism could be explained with the electron hopping model. Frequency exponential factor (s) was calculated and it was found between 0.4 and 0.8.

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Complete Micro‐Structural Analysis and Elastic Properties of Sm³⁺‐Doped Ni‐Mn‐Zn Mixed Spinel Ferrite Nanoparticles

More¹,

Kadam

Kadam³

et al. 2021

Macromolecular Symposia

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A series of Ni‐Mn‐Zn mixed spinel ferrite doped with Sm3+ ions is prepared by using sol‐gel auto‐combustion technique. Single phase cubic spinel structure of all the samples is confirmed by using XRD analysis. Incorporation of Sm3+ ions in Ni‐Mn‐Zn ferrites increases the lattice parameter from 8.4105 to 8.4134 Å. Williamson – Hall (W‐H) and strain size plot (SSP) analysis confirms the tensile‐type strain induced in the crystal lattice, which increases with the addition of Sm3+ ions. Average crystallite size estimated from Scherrer equation is found in the range 21.7–24.9 nm, which in good agreement with the results obtained from W‐H and SSP analysis. Infrared spectra recorded in the range 350–800 cm−1 reveals the characteristic features of spinel ferrites. Higher frequency band ν1 is observed near 580 cm−1 and lower frequency band ν2 is observed near 380 cm−1. By using the IR data, elastic constant (stiffness constant) and elastic moduli (Young's modulus, bulk modulus, and rigidity modulus) are estimated. Debye temperature obtained from Anderson formula ranging from 535 to 562 K and from Waldron equation ranging from 676 to 713 K with the substitution of Sm3+ ions.

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The infrared absorption and dielectric properties of Li–Ga ferrite

Cited by 103 publications

References 17 publications

Structural and Elastic Properties of Li-Ni Ferrite

Structural and Elastic Properties of Li-Ni Ferrite

IR Spectra, Elastic and Dielectric Properties of Li–Mn Ferrite

Complete Micro‐Structural Analysis and Elastic Properties of Sm³⁺‐Doped Ni‐Mn‐Zn Mixed Spinel Ferrite Nanoparticles

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The infrared absorption and dielectric properties of Li–Ga ferrite

Cited by 103 publications

References 17 publications

Structural and Elastic Properties of Li-Ni Ferrite

Structural and Elastic Properties of Li-Ni Ferrite

IR Spectra, Elastic and Dielectric Properties of Li–Mn Ferrite

Complete Micro‐Structural Analysis and Elastic Properties of Sm3+‐Doped Ni‐Mn‐Zn Mixed Spinel Ferrite Nanoparticles

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Complete Micro‐Structural Analysis and Elastic Properties of Sm³⁺‐Doped Ni‐Mn‐Zn Mixed Spinel Ferrite Nanoparticles