Copper substitution effect on the structural properties of nickel ferrites

Rais, A.; Taïbî, K.; Addou, A.; Zanoun, A.; Kée, D. De

doi:10.1016/j.ceramint.2014.06.037

Cited by 76 publications

(13 citation statements)

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“…This linear behavior of a exp with Al content was reported for other similar ferrites systems passing from partially to completely inverse spinel type structure [18]. Nickel ferrite, NiFe 2 O 4 has totally inverse spinel structure with half of the Fe 3+ ions in B sites and the other half in A sites and all the Ni 2+ ions in octahedral sites [16]. In the NiAl x Fe 2-x O 4 ferrites, the Ni 2+ ions exclusively occupy the octahedral sites, while some of the Al 3+ ions prefer to occupy the tetrahedral sites and the rest are stable in the octahedral sites [21].…”

Section: X-ray Diffraction Analysissupporting

confidence: 80%

“…The ingredient materials were analytical high purity grade NiCO 3 , Fe 2 O 3 and Al 2 O 3 (BDH). These were weighed stoichiometrically as per chemical formula unit and the details of samples preparation are described in a previous publication [16]. Sample pellets were first sintered at 1000 o C for 12 hours then they were sintered a second time at 1100 o C for 24 hours.…”

Section: Methodsmentioning

confidence: 99%

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Structural and vibrational studies of NiAlxFe2−xO4 ferrites (0≤x≤1)

Bouhadouza

Rais

Kaoua

et al. 2015

Ceramics International

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Section: X-ray Diffraction Analysissupporting

confidence: 80%

Section: Methodsmentioning

confidence: 99%

Structural and vibrational studies of NiAlxFe2−xO4 ferrites (0≤x≤1)

Bouhadouza

Rais

Kaoua

et al. 2015

Ceramics International

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“…However, all diffraction peaks were related only to NiFe 2 O 4 and no contributions coming from the reactants were detected. The lattice parameter obtained for NiFe 2 O 4 was a = 8.340 Å, which is in the range of values reported in the literature [9,16] . The main findings of the Rietveld analysis are summarized in Table 1.…”

Section: Resultssupporting

confidence: 79%

“…The different energy values in these vibrations are the result of the different distances between the Fe and O atoms in the spinel structure. In this case, the length of the Fe-O bond in (A) sites (0.189-0.191 nm) is less than the length of the Fe-O bond in [B] sites (0.203-0.205 nm) [16] . In Figure 4, it is noticed that as the temperature increases, the intensity of the IR band at 411 cm -1 increases in comparison to the intensity of the IR band at 599 cm -1 .…”

Section: Resultsmentioning

confidence: 84%

Cation Vacancies in NiFe2O4 During Heat Treatments at High Temperatures: Structural, Morphological and Magnetic Characterization

2019

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Nickel ferrite (NiFe 2 O 4) was synthesized by mixing stoichiometric amounts of α-Fe 2 O 3 and NiO using mechanical milling and heat treatments at high temperatures. The physical characterization of the samples was carried out using X-ray diffraction, infrared and Raman spectroscopies, Mössbauer spectrometry, magnetization measurements, scanning electron microscopy and energy dispersive X-ray spectroscopy. We found that NiFe 2 O 4 production increases from 81 to 100 wt. % with increasing temperature. Additionally, the lattice parameter and the saturation magnetization increase with increasing temperature. On the other hand, Mössbauer spectrometry showed that there is a decrease in the subspectral areas ratio for Fe 3+ cations at tetrahedral (A) and octahedral [B] sites, A A /A B , with the increase of the temperature. In the SEM micrographs it was observed that the samples consisted of particles with irregular shapes and micrometric sizes. From IR spectra, the intensity of the 411 cm-1 band (vibrations at octahedral sites) increases relative to the intensity of the 599 cm-1 band (vibrations at tetrahedral sites) with increasing temperature. From the results obtained in the magnetization curves, it was possible to confirm the synthesis of NiFe 2 O 4. As the heat treatment temperature increases, hysteresis loops with S-type geometric forms were obtained. All the results suggest that a defective spinel NiFe 2 O 4 is formed at 1000 °C, and that as the temperature increases, the defects gradually disappear. Neither cation reordering phenomena nor possible evaporation of chemical elements were the dominant effects to account for the results. The results can be explained if it is assumed that [B]-sites cation vacancies are gradually filled with cations as the temperature of the heat treatment increases.

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“…Generally, the absorption band ν 1 is greater than ν 2 because the shorter bond length of tetrahedral cluster and longer bond length of octahedral cluster [24]. The change in lattice constant and cation redistribution is responsible for shift in characteristics absorption bands [25,26]. The band stretching for tetrahedral sites would lead to higher force constant than that of band stretching for the octahedral site [27].…”

Section: Ftir Studymentioning

confidence: 99%