X-ray analysis and IR absorption spectra of Li-Ge ferrite

Mazen, S. A.; Abdallah, M. H.; Nakhla, R.I.; Zaki, H.M.; Metawe, F.

doi:10.1016/0254-0584(93)90116-4

Cited by 107 publications

(38 citation statements)

References 13 publications

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“…According to Tarte [19] and Mazen et al [14], the high frequency band ν 2 (1) recorded only for x = 0.0 and x = 0.1 in the range of 450-458 cm −1 could be assigned to Li + -O 2− complexes at the octahedral site. The intensity of this band goes on decreasing with increasing x since the Li + content decreases with increasing x, so it persists only up to…”

Section: X-ray Analysis and Ir Absorptionmentioning

confidence: 99%

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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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Section: X-ray Analysis and Ir Absorptionmentioning

confidence: 99%

“…No absorption bands were observed above 1000 cm −1 . The IR spectrum of pure Li ferrite (x = 0.0) has been analyzed in detail by Mazen et al [14]. It is noticed that the primary band υ * 1 and the second absorption band υ * 2 are in the ranges of 585-546 cm −1 and 379-372 cm −1 , respectively.…”

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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“…It is known that there is a correlation between the ionic radii of both A-and B-sublattices and the lattice parameter. Then, the lattice parameter can be calculated theoretically using the following equation [15]:…”

Section: Cation Distribution and Theoretical Latticementioning

confidence: 99%

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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“…The room temperature FT-IR spectra of the prepared Ni 1-s Zn s Fe 2 O 4 samples were recorded between the wave numbers 350 cm -1 to 1000 cm -1 , which is a common feature of ferrites as shown in Figure 2 19,20,27,28,31,32 . It was also found that, the Fe-O bond distance of the T d sites (0.189 nm) and this is smaller than that of the O h sites (0.199 nm) 33 .…”

Section: Resultsmentioning

confidence: 99%

FT-IR Studies of Nickel Substituted Polycrystalline Zinc Spinel Ferrites for Structural and Vibrational Investigations

2017

Chem Sci Trans

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FT-IR spectra of Ni 1-s Zn s Fe 2 O 4 spinel ferrite, s changed by 0.2 according to 0.0 ≤ s ≤1.0, have been analyzed in the frequency range (350−1000) cm -1 . Six polycrystalline ferrites samples were synthesized using the conventional standard double sintering ceramic method. Two main absorption bands were observed, their positions were found to be strongly dependent on s-value. The high frequency band in the range 550-600 cm −1 and a low frequency band at around 400 cm −1 were assigned to tetrahedral T d and octahedral O h sites, respectively, of spinel lattice. Force constant (F C ) was calculated for T d and O h sites and was found to decrease with increasing Zn ions. Threshold frequency ν th for the electronic transition was determined and found to increase with increasing Zn ions. Cations distribution for the prepared mixed ferrite was concluded based on the FT-IR spectra. The ionic radii for each site were correlated to the cations distribution of the given ferrite.

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X-ray analysis and IR absorption spectra of Li-Ge ferrite

Cited by 107 publications

References 13 publications

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

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

Structural and Elastic Properties of Li-Ni Ferrite

FT-IR Studies of Nickel Substituted Polycrystalline Zinc Spinel Ferrites for Structural and Vibrational Investigations

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