Mössbauer study of chromium-substituted nickel ferrites

Gismelseed, A. M.; Yousif, A. A.

doi:10.1016/j.physb.2005.09.014

Cited by 72 publications

(34 citation statements)

References 20 publications

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“…Thus it is natural to assign the first one to iron at tetrahedral sites and the second pattern to iron at octahedral sites. In agreement with Rais et al [5] the obtained intensities are Int(tet) ≈55% and Int(oct) ≈45%, while Gismelseed and Yousif [4] got 52% and 48% in a similar fit. Assuming intensities proportional to the amount of iron at the two sites, the result is then incorrect: according to the formula, the amount of iron at the tetrahedral site can not be bigger than the amount of iron at the octahedral site.…”

Section: Ms Measurements In Zero External Fieldsupporting

confidence: 90%

“…3). The same feature is seen in earlier published spectra (Lee et al [3], Gismelseed and Yousif [4]). Therefore, the fit in Fig.…”

Section: Ms Measurements In Zero External Fieldsupporting

confidence: 87%

“…The observed change in lattice constant (a 0 ) with composition (x) in the present study shows partial agreement with results from other studies. Thus for Fe-rich compositions, a decrease in a 0 with increase in Cr-content of about the same magnitude as observed here was also obtained by Lee et al [3], Singhal and Chandra [7], Gismelseed and Yousif [4] and Rais et al [5]. The latter two seem to have used the same samples in their experiments.…”

supporting

confidence: 89%

“…Partly this may be explained by the fact that neither Lee et al [3] (studied interval x = 0-0.6), nor Singhal and Chandra [7] (studied interval x = 0-1.2) or Gismelseed and Yousif [4] and Rais et al [5] (studied interval x = 0-1.4) synthesized the most Crrich compositions. However, the increase in a 0 with increase in Cr, for the Cr-richest compositions studied in this paper, agrees excellently with recent results by Park and Kim [10], who studied Fe substituted NiCr 2 O 4 in the interval x = 2-1.5 (Fig.…”

mentioning

confidence: 99%

“…Chappert and Frankel [2], Lee et al [3], Gismelseed and Yousif [4] and Rais et al [5] all declare that the substituting Cr 3+ ions only populate the octahedral site. In the case for x > 1, iron is according to Rais et al [5] only found in the tetrahedral site while Chappert and Frankel [2] and Gismelseed and Yousif [4] also place iron in the octahedral site. Fayek and Ata-Allah [6] and Singhal and Chandra [7] are however of a contrary opinion.…”

mentioning

confidence: 99%

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Cation ordering in NiFe_2–xCr_x O₄‐spinels studied by Mössbauer spectroscopy in external fields

Winell

Amcoff²,

Ericsson

2008

Physica Status Solidi (b)

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NiFe2–x Crx O4, 0 ≤ x ≤ 1.8, produced from appropriate oxides, has been studied using Mössbauer spectroscopy (MS) at low and ambient temperatures and in external fields up to 7 Tesla. X‐ray diffraction (XRD) shows all samples to be single phase cubic spinels, where a0 changes with change in x, as a concave curve, with a minimum at around x = 1. Analyses, based on Mössbauer spectra, show NiFe2–x Crx O4 to be a nearly perfect inverted spinel for x ≤ 0.6. However, for higher x ‐values the ordering is more complicated. It is shown that iron also populates the octahedral positions for x ≥ 0.8. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Ms Measurements In Zero External Fieldsupporting

confidence: 90%

“…3). The same feature is seen in earlier published spectra (Lee et al [3], Gismelseed and Yousif [4]). Therefore, the fit in Fig.…”

Section: Ms Measurements In Zero External Fieldsupporting

confidence: 87%

supporting

confidence: 89%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Cation ordering in NiFe_2–xCr_x O₄‐spinels studied by Mössbauer spectroscopy in external fields

Winell

Amcoff²,

Ericsson

2008

Physica Status Solidi (b)

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The Effects of Glass Doping, Temperature and Time on the Morphology, Composition, and Iron Redox of Spinel Crystals

Matyáš

Amonette

Kukkadapu

et al. 2014

Ceramic Transactions Series

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Precipitation of large crystals/agglomerates of spinel and their accumulation in the pour spout riser of a Joule-heated ceramic melter during idling can plug the melter and prevent pouring of molten glass into canisters. Thus, there is a need to understand the effects of spinel-forming components, temperature, and time on the growth of crystals in connection with an accumulation rate. In our study, crystals of spinel [Fe, Ni, Mn, Zn, Sn][Fe, Cr] 2 O 4 were precipitated from simulated high-level waste borosilicate glasses containing different concentrations of Ni, Fe, and Cr by heat treating at 850 and 900°C for different times. These crystals were extracted from the glasses and analyzed with scanning electron microscopy and image analysis for size and shape, with inductively coupled plasma-atomic emission spectroscopy and atom probe tomography for concentration of spinel-forming components, and with wet colorimetry and Mössbauer spectroscopy for Fe 2+ /Fe total ratio. High concentrations of Ni, Fe, and Cr in glasses resulted in the precipitation of crystals larger than 100 µm in just two days. Crystals were a solid solution of NiFe 2 O 4 , NiCr 2 O 4 , and ɤ-Fe 2 O 3 (identified only in the high-Ni-Fe glass) and also contained small concentrations of less than 1 at% of Li, Mg, Mn, and Al. INTRODUCTIONThe U.S. Department of Energy is building the Waste Treatment and Immobilization Plant at the Hanford Site in Washington State to remediate 55 million gallons of radioactive waste that is being temporarily stored in 177 underground tanks. The plan is to vitrify the waste into a durable borosilicate glass with Joule-heated ceramic melters. To do this efficiently and costeffectively, the waste loading in the glasses must be maximized.

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Cation distribution study of nanocrystalline NiFe_2−xCr_xO₄ferrite by XRD, magnetization and Mössbauer spectroscopy

Patange¹,

Shirsath

Jadhav

et al. 2011

Physica Status Solidi (a)

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The spinel ferrite systems NiFe 2Àx Cr x O 4 (with x ¼ 0.0-1.0 in step of 0.2) were prepared by wet chemical co-precipitation method, using sulphates of respective metal ions. Formation of single phase spinel crystal structure of sample has been confirmed by X-ray diffraction method. Magnetic parameters such as coercivity and saturation magnetization are measured by employing vibrating samples magnetometer (VSM). The saturation magnetization and magneton number (n B ) decreases with increase in Cr 3þ content x. The Mössbauer spectra taken at 300 K and spectra are assigned to two strongly overlapping sextets corresponding to tetrahedral A sites and octahedral B sites. The cation distribution of ferrites system has been calculated by X-ray method, the behaviour of magnetization curve and Mössbauer spectra. The evaluation of cation distribution indicates that, in Cr-dominant region, few nickel ions occupies tetrahedral A sites which convert perfect inverse spinel to partially normal spinel structure.

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Mössbauer study of chromium-substituted nickel ferrites

Cited by 72 publications

References 20 publications

Cation ordering in NiFe_2–xCr_x O₄‐spinels studied by Mössbauer spectroscopy in external fields

Cation ordering in NiFe_2–xCr_x O₄‐spinels studied by Mössbauer spectroscopy in external fields

The Effects of Glass Doping, Temperature and Time on the Morphology, Composition, and Iron Redox of Spinel Crystals

Cation distribution study of nanocrystalline NiFe_2−xCr_xO₄ferrite by XRD, magnetization and Mössbauer spectroscopy

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Mössbauer study of chromium-substituted nickel ferrites

Cited by 72 publications

References 20 publications

Cation ordering in NiFe2–xCrx O4‐spinels studied by Mössbauer spectroscopy in external fields

Cation ordering in NiFe2–xCrx O4‐spinels studied by Mössbauer spectroscopy in external fields

The Effects of Glass Doping, Temperature and Time on the Morphology, Composition, and Iron Redox of Spinel Crystals

Cation distribution study of nanocrystalline NiFe2−xCrxO4ferrite by XRD, magnetization and Mössbauer spectroscopy

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Product

Resources

About

Cation ordering in NiFe_2–xCr_x O₄‐spinels studied by Mössbauer spectroscopy in external fields

Cation ordering in NiFe_2–xCr_x O₄‐spinels studied by Mössbauer spectroscopy in external fields

Cation distribution study of nanocrystalline NiFe_2−xCr_xO₄ferrite by XRD, magnetization and Mössbauer spectroscopy