X-ray and infrared studies of chromium substituted magnesium ferrite

Kawade, V. B.; Bichile, G. K.; Jadhav, K. M.

doi:10.1016/s0167-577x(99)00155-x

Cited by 60 publications

(27 citation statements)

References 14 publications

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“…This is similar to what happens when Cr 3+ ions replace the Fe 3+ ions in various spinel ferrites [17][18][19]. For the spinel ferrites, the Cr 3+ ions have a strong B-site (octahedral site) preference as determined by X-ray diffraction measurements [17], Mössbauer spectroscopy [18], and neutron diffraction studies employing the program FULLPROF (Rietveld method) [19] to refine the structure. For the spinel ferrites, the degree of inversion decreases with increasing Cr content [16,[20][21][22].…”

Section: +supporting

confidence: 56%

“…It is assumed that the Cr 3+ ions have their spins align (but with a small spin canting) to the spins of the Fe spins within the sublattices [16]. This is similar to what happens when Cr 3+ ions replace the Fe 3+ ions in various spinel ferrites [17][18][19]. For the spinel ferrites, the Cr 3+ ions have a strong B-site (octahedral site) preference as determined by X-ray diffraction measurements [17], Mössbauer spectroscopy [18], and neutron diffraction studies employing the program FULLPROF (Rietveld method) [19] to refine the structure.…”

Section: +mentioning

confidence: 98%

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Cr‐site preference of BaFe_12–xCr_xO₁₉ hexaferrite ceramics monitored by Mössbauer spectroscopy

Ounnunkad

Phanichphant

Winotai

et al. 2007

Physica Status Solidi (b)

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PACS 61.10 Nz, 75.50. Gg, 75.60.Ej, 76.80.+y Site preference of Cr in the M-type barium ferrite ceramics was monitored by powder X-ray diffraction (XRD), magnetization measurements and Mössbauer spectroscopy. The calcined BaFe 12-x Cr x O 19 powders (x = 0.0 -0.8) obtained by the sol gel method were die-pressed into pellets and then sintered at 1300 °C in a oxygen atmosphere for 12 hrs. All the phases of the ceramics were of the pure magnetoplumbite structure. The saturation magnetization (M s ) is found to be a function of Cr ion content. The M S of the ceramics decreases due to the dilution of the magnetic interaction with increasing Cr concentration. The coercivity (H c ) of the ceramics increases due to finer grain observed by scanning electron microscopy (SEM). Fitted Mössbauer spectra show that Cr ions preferentially occupy into the 2a, 12k and 4 f 2 Fe crystallographic sites.

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Section: +supporting

confidence: 56%

Section: +mentioning

confidence: 98%

Cr‐site preference of BaFe_12–xCr_xO₁₉ hexaferrite ceramics monitored by Mössbauer spectroscopy

Ounnunkad

Phanichphant

Winotai

et al. 2007

Physica Status Solidi (b)

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“…There are several methods for synthesising nano-sized spinel ferrites, such as co-precipitation, sol-gel, microemulsion, hydrothermal and reverse micelle method [3][4][5]. Magnesium ferrite is a typical spinel in which the cation distribution in the crystal lattice site is sensitive to heat treatment due to high diffusibility of Mg 2þ ions [6,7]. Magnesium ferrites are used as humidity sensors [8], catalysts [9] and also in magnetic and gas sensing applications [10,11].…”

Section: Introductionmentioning

confidence: 99%

A comparative study of structural, electrical and magnetic properties of magnesium ferrite nanoparticles synthesised by sol-gel and co-precipitation techniques

Thankachan¹,

Xavier²,

Jacob³

et al. 2013

Journal of Experimental Nanoscience

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A comparative study of structural, electrical and magnetic properties of magnesium ferrite nanoparticles synthesised by sol-gel and co-precipitation techniques, Journal of Experimental Nanoscience, 8:3, 347-357, DOI: 10.1080/17458080.2012 Nano-sized magnesium ferrite was synthesised using co-precipitation and sol-gel techniques. Structural characterisation was performed using X-ray diffractometer (XRD), Fourier transform infrared (FTIR) spectrometer and scanning electron microscope. XRD analysis reveals the prepared samples are single phasic without any impurity. Particle size calculation shows that the crystallite size of sol-gel prepared samples is 9 nm and co-precipitation sample is 11 nm. FTIR analysis confirmed spinel structure of the prepared samples. Magnetic measurements show that both the samples are ferromagnetic with a high degree of isotropy in co-precipitation derived sample. The frequency dependence of the dielectric constant in the range 100 Hz-20 MHz was also investigated in the temperature range 303-533 K. The results of both the samples followed Maxwell-Wagner model based on interfacial polarisation in consonance with Koops theory.Keywords: nano-structured materials; magnesium ferrite; sol-gel technique; co-precipitation; magnetic measurement; dielectric properties IntroductionDiverse practical applications of spinel ferrites of the type MFe 2 O 4 has attracted the attention of researchers for decades. Nano-sized magnetic ferrite particles exhibit unique properties, which enable their use in a wide range of applications such as high density recording, high frequency devices and magnetic refrigerators [1,2]. There are several methods for synthesising nano-sized spinel ferrites, such as co-precipitation, sol-gel, microemulsion, hydrothermal and reverse micelle method [3][4][5]. Magnesium ferrite is a typical spinel in which the cation distribution in the crystal lattice site is sensitive to heat treatment due to high diffusibility of Mg 2þ ions [6,7]. Magnesium ferrites are used as humidity sensors [8], catalysts [9] and also in magnetic and gas sensing applications [10,11]. When its crystallite size is below a certain value, MgFe 2 O 4 possesses unique superparamagnetic properties at room temperature and has promising potential for applications in transformers, ferrofluids and magnet cores of coils [12,13].

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“…around 600 cm -1 and weak absorption in the range 410-450 cm -1 [9]. This difference in the band position is expected because of the difference in the M n+ -O 2-distance for the octahedral and tetrahedral groups.…”

Section: Ir Spectramentioning

confidence: 92%

Low sintering temperature of Mg-Cu-Zn ferrite prepared by the citrate precursor method

Atassi

Tally

2006

JICS

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Mg-Cu-Zn ferrite was prepared through a wet synthetic method by a self-combustion reaction directly from a citrate precursor. The as-synthesized powders were sintered at 750 °C for only 2 h. XRD patterns and FTIR spectra confirm the formation of single phase Mg-Cu-Zn ferrite after combustion. To the best of our knowledge, this is the first time that Mg-Cu-Zn ferrite is sintered at such a low temperature. The sintering process increased the crystallinity of the solid and the domain sizes.

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X-ray and infrared studies of chromium substituted magnesium ferrite

Cited by 60 publications

References 14 publications

Cr‐site preference of BaFe_12–xCr_xO₁₉ hexaferrite ceramics monitored by Mössbauer spectroscopy

Cr‐site preference of BaFe_12–xCr_xO₁₉ hexaferrite ceramics monitored by Mössbauer spectroscopy

A comparative study of structural, electrical and magnetic properties of magnesium ferrite nanoparticles synthesised by sol-gel and co-precipitation techniques

Low sintering temperature of Mg-Cu-Zn ferrite prepared by the citrate precursor method

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X-ray and infrared studies of chromium substituted magnesium ferrite

Cited by 60 publications

References 14 publications

Cr‐site preference of BaFe12–xCrxO19 hexaferrite ceramics monitored by Mössbauer spectroscopy

Cr‐site preference of BaFe12–xCrxO19 hexaferrite ceramics monitored by Mössbauer spectroscopy

A comparative study of structural, electrical and magnetic properties of magnesium ferrite nanoparticles synthesised by sol-gel and co-precipitation techniques

Low sintering temperature of Mg-Cu-Zn ferrite prepared by the citrate precursor method

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Cr‐site preference of BaFe_12–xCr_xO₁₉ hexaferrite ceramics monitored by Mössbauer spectroscopy

Cr‐site preference of BaFe_12–xCr_xO₁₉ hexaferrite ceramics monitored by Mössbauer spectroscopy