Infrared absorption studies of the system Sr2Me2Fe12O22

Salunkhe, M. Y.; Choudhary, D. S.; Kulkarni, D. K.

doi:10.1016/j.vibspec.2003.10.002

Cited by 19 publications

(11 citation statements)

References 15 publications

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“…The vibrational spectrum of Y‐type hexaferrites is closely related to that of the spinel ferrites. This may be due to the presence of an S block and the absence of a trigonal bipyramidal site in both types of ferrites 22 . The FTIR spectrum of an unannealed sample (Fig.…”

Section: Resultsmentioning

confidence: 99%

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Physical and Electrical Properties of Nanosized Mn‐ and Cr‐Doped Strontium Y‐Type Hexagonal Ferrites

Iqbal

Liaqat

2010

Journal of the American Ceramic Society

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Nanometer‐sized crystallites of Y‐type strontium hexaferrite, Sr2Ni2Fe12O22 and its Mn‐ and Cr‐doped derivatives have been synthesized by the sol–gel method. Y‐type phase formation was achieved at a considerably lower temperature of 950°C than is required in the traditional solid‐state method (1200°C). The effect of doping of manganese at the tetrahedral site, Sr2Ni2−xMnx Fe12O22 (x=0.0–2.0), and chromium at octahedral site, Sr2Ni2 Fe12−yCryO22 (y=0.0–1.5), has been studied. The crystal structure remains unaffected by the substitutions. The crystallite size in the range of 13–45 nm is calculated from the X‐ray diffraction data. The energy‐dispersive X‐ray fluorescence analysis shows that Y‐type hexaferrites can be prepared with a base of strontium. The extent of doped Cr+3 ions at the octahedral site has been increased from the reported maximum value of y=1.5. Scanning electron micrographs of the samples showed a homogenous microstructure. The dc electrical resistivity studies show that these hexaferrites exhibit high resistivity at room temperature. Cr‐doped samples have comparatively higher resistivity than Mn‐doped samples. The doubly doped (Cr+Mn) samples possess high resistivity (7.37 × 109Ω‐cm), a low dielectric constant (33.88 at 3000 Hz), and a high Curie temperature (>698 K). The dielectric energy losses are minimized by increasing the Mn and Cr contents of the synthesized samples.

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Section: Resultsmentioning

confidence: 99%

“…This may be due to the presence of an S block and the absence of a trigonal bipyramidal site in both types of ferrites. 22 The FTIR spectrum of an unannealed sample ( Fig. 4(a)) shows two dominant peaks due to the -COOH group (1635 cm À1 ) and NO 3 À1 ions (1384 cm À1 ), respectively.…”

Section: (4) Infrared Absorption Studiesmentioning

confidence: 99%

Physical and Electrical Properties of Nanosized Mn‐ and Cr‐Doped Strontium Y‐Type Hexagonal Ferrites

Iqbal

Liaqat

2010

Journal of the American Ceramic Society

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“…The characteristic band at 1380 cm −1 is ascribed to the symmetric vibration of NO 3 − group. The sharp band at 997 cm −1 is more significant in Mg-based ferrite [46]. The absorption peaks corresponding to 997 and 710 cm −1 are related to the presence of Fe ions in ferrites [47].…”

Section: Ftir Spectramentioning

confidence: 90%

Cytotoxic Effect of Nanocrystalline MgFe₂O₄ Particles for Cancer Cure

Kanagesan

Hashim

Subramani

et al. 2013

Journal of Nanomaterials

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Nanocrystalline magnesium ferrites (MgFe2O4) were produced with an average grain size of about 20 nm. Their structural, morphological, and magnetic characterizations were studied. The cytotoxic effects of MgFe2O4nanoparticles in various concentrations (25, 50, 100, 200, 400, and 800 μg/mL) against MCF-7 human breast cancer cells were analyzed. MTT assay findings suggest the increased accumulation of apoptotic bodies with the increasing concentration of MgFe2O4nanoparticles in a dose-dependent manner. Flow cytometry analysis shows that MgFe2O4nanoparticles in 800 μg/mL concentration are more cytotoxic compared to vehicle-treated MCF-7 cells and suggests their potential utility as a drug carrier in the treatment of cancer.

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“…2b) and disappears at higher temperature. This can be attributed to the decrease in the quantity of water molecules in sintered samples [29]. The band at 1384 cm À1 in gel corresponds to the presence of NO 3À ions, which disappear at a higher temperature [24].…”

Section: Structural Propertiesmentioning

confidence: 99%

Synthesis and magnetic properties of barium–calcium hexaferrite particles prepared by sol–gel and microemulsion techniques

Jotania

Khomane

Chauhan

et al. 2008

Journal of Magnetism and Magnetic Materials

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Infrared absorption studies of the system Sr2Me2Fe12O22

Cited by 19 publications

References 15 publications

Physical and Electrical Properties of Nanosized Mn‐ and Cr‐Doped Strontium Y‐Type Hexagonal Ferrites

Physical and Electrical Properties of Nanosized Mn‐ and Cr‐Doped Strontium Y‐Type Hexagonal Ferrites

Cytotoxic Effect of Nanocrystalline MgFe₂O₄ Particles for Cancer Cure

Synthesis and magnetic properties of barium–calcium hexaferrite particles prepared by sol–gel and microemulsion techniques

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Infrared absorption studies of the system Sr2Me2Fe12O22

Cited by 19 publications

References 15 publications

Physical and Electrical Properties of Nanosized Mn‐ and Cr‐Doped Strontium Y‐Type Hexagonal Ferrites

Physical and Electrical Properties of Nanosized Mn‐ and Cr‐Doped Strontium Y‐Type Hexagonal Ferrites

Cytotoxic Effect of Nanocrystalline MgFe2O4 Particles for Cancer Cure

Synthesis and magnetic properties of barium–calcium hexaferrite particles prepared by sol–gel and microemulsion techniques

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Cytotoxic Effect of Nanocrystalline MgFe₂O₄ Particles for Cancer Cure