Impact of yttrium on the physical, electro-magnetic and dielectric properties of auto-combustion synthesized nanocrystalline strontium hexaferrite

Shekhawat, Deepshikha; Roy, P.K.

doi:10.1007/s10854-018-0387-0

Cited by 16 publications

(9 citation statements)

References 51 publications

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“…The vibrational frequency for Fe-O bond can be resolute by the following Eq. (6) [33] where is wave number corresponding to the absorption peak, l is the velocity of light, t is the average force constant in case of Fe-O bond and μ is the effective mass of the Fe-O bond calculated using the Eq. 7:…”

Section: Ftir Analysismentioning

confidence: 99%

Nanocrystalline cerium-doped Y-type barium hexaferrite; a useful catalyst for selective oxidation of styrene

Suthar

Srivastava

Joshi

et al. 2020

J Mater Sci: Mater Electron

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The cerium-doped Y-type barium hexaferrites Ba 2−x Ce x Co 2 Fe 12 O 22 (x = 0.0, 0.1, 0.2, and 0.3) were synthesized using the sol-gel auto combustion method. The synthesized nanocrystalline hexaferrite powders were characterized; especially it's structural, morphological, and magnetic properties, through X-ray diffractometer, FTIR spectroscopy, scanning electron microscopy and vibrating sample magnetometer, respectively. The effects of catalyst amount, reaction temperature and time, solvent and oxidizing agent required for the entire conversion of styrene to benzaldehyde were also examined with pure Y-type barium hexaferrite (BrM). The catalytic performance of the BrM powder was measured for its suitability in the oxidation of styrene using various oxidants, and the isolated yield of the benzaldehyde was calculated using the column chromatography separation. The as-prepared 20 mg BrM samples showed total conversion of styrene and 66% isolated yield for benzaldehyde at 120 °C for 24 h in the presence of trifluoroacetic acid as an oxidant. The effect of cerium doping on the benzaldehyde selectivity was also analyzed at optimized conditions and found that cerium-doped samples showed excellent catalytic performance. Paralleled with the pristine barium hexaferrite, the catalytic efficiency was significantly enriched and exhibited its maximum performance with Ba 1.8 Ce 0.2 Co 2 Fe 12 O 22 ferrite, almost 71% selectivity was achieved with the same reaction conditions. This enhanced performance was correlated with the XPS studies for x = 0.2 sample. The as-prepared catalyst was magnetically separable to reprocess. There was no remarkable loss of catalytic activity when it was reprocessed for five consecutive trials.

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Section: Ftir Analysismentioning

confidence: 99%

Nanocrystalline cerium-doped Y-type barium hexaferrite; a useful catalyst for selective oxidation of styrene

Suthar

Srivastava

Joshi

et al. 2020

J Mater Sci: Mater Electron

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“…Also, D. Shekhawat and P.K. Roy [15] reported the influence of Y substitution on the structural, dielectric, and magnetic properties of Sr–HFs synthesized by the autocombustion approach. The structural analysis indicates that the Y ions reorganize themselves without troubling the parent lattice.…”

Section: Introductionmentioning

confidence: 99%

Manganese/Yttrium Codoped Strontium Nanohexaferrites: Evaluation of Magnetic Susceptibility and Mossbauer Spectra

et al. 2018

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Manganese (Mn)- and yttrium (Y)-substituted Sr-nanohexaferrites (MYSNHFs) of composition Sr1−xMnxFe12−xYxO19 (with 0.0 ≤ x ≤ 0.5) were prepared by citrate sol-gel autocombustion method. As-prepared MYSNHFs were characterized via diverse analytical techniques to determine the influence of Mn and Y cosubstitution on their microstructures and magnetic properties. 57Fe Mössbauer spectra of the MYSNHFs were used to evaluate the variation in the line width, isomer shift, quadrupole splitting, and hyperfine magnetic field values. It was shown that the dopant ions could preferentially occupy the 12k, 4f2, and 2b sites. Furthermore, the observed shift in the blocking temperatures of the studied MYSNHFs towards lower values with rising Mn2+ and Y3+ contents was attributed to the overall particles size reduction. Meanwhile, the AC susceptibility of the proposed MYSNHFs revealed that the magnetic interactions were weakened with the increase in dopant contents which was ascribed to the replacement of both Sr2+ and Fe3+ ions by the Mn2+ and Y3+ dopants.

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“…24 For Y-doping on hexaferrites, most of studies have been conducted on strontium and barium M-type hexaferrites. 25,26 Additionally, Y-doping was performed on Fe sites. 25,26 The microwave absorption properties of Y-doping strontium Mtype hexaferrites were low (RL = −18.91 dB with −10 dB bandwidth of 2.18 GHz for x = 0.3 for t = 2.6 mm) in the frequency range of the X band.…”

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“…25,26 Additionally, Y-doping was performed on Fe sites. 25,26 The microwave absorption properties of Y-doping strontium Mtype hexaferrites were low (RL = −18.91 dB with −10 dB bandwidth of 2.18 GHz for x = 0.3 for t = 2.6 mm) in the frequency range of the X band. 27 There are rare studies on the Y-doped Ba site of hexaferrites.…”

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Enhanced microwave absorption properties of Y‐Co₂Z/PANI hexaferrites composites in the frequency range of 0.1–18 GHz

et al. 2021

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Recently, there has been an increasing demand in the electronic equipment industry such as mobile phones, laptop computers, and tablets, modems and antennas, which require the shift to centimeter-scale wavelengths in the microwave range . The growth of devices functioning at this GHz frequency range creates the serious risk of electromagnetic interference (EMI) problems. Furthermore, health concern issues are being raised all over the world due to electromagnetic radiation, which could affect human health, resulting in memory loss, fatigue, lack of sleep, headaches, etc. 1 In order to protect biological systems and electronic equipment against potential damage due to electromagnetic (EM) pollution, especially caused by the explosive utilization of gigahertz (GHz) EM waves, a functional material with low density, strong absorption, thin thickness, and wide absorption frequency range is intensively pursued. 2-4 Nowadays, researchers have been attempting to study all kinds of materials which can absorb EM wave by converting EM energy into thermal energy or dissipating them through interference, which depend on their dielectric loss and/or magnetic loss ability. 5 The balance of permittivity and permeability, which is called EM wave impedance matching, is beneficial for

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Impact of yttrium on the physical, electro-magnetic and dielectric properties of auto-combustion synthesized nanocrystalline strontium hexaferrite

Cited by 16 publications

References 51 publications

Nanocrystalline cerium-doped Y-type barium hexaferrite; a useful catalyst for selective oxidation of styrene

Nanocrystalline cerium-doped Y-type barium hexaferrite; a useful catalyst for selective oxidation of styrene

Manganese/Yttrium Codoped Strontium Nanohexaferrites: Evaluation of Magnetic Susceptibility and Mossbauer Spectra

Enhanced microwave absorption properties of Y‐Co₂Z/PANI hexaferrites composites in the frequency range of 0.1–18 GHz

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Impact of yttrium on the physical, electro-magnetic and dielectric properties of auto-combustion synthesized nanocrystalline strontium hexaferrite

Cited by 16 publications

References 51 publications

Nanocrystalline cerium-doped Y-type barium hexaferrite; a useful catalyst for selective oxidation of styrene

Nanocrystalline cerium-doped Y-type barium hexaferrite; a useful catalyst for selective oxidation of styrene

Manganese/Yttrium Codoped Strontium Nanohexaferrites: Evaluation of Magnetic Susceptibility and Mossbauer Spectra

Enhanced microwave absorption properties of Y‐Co2Z/PANI hexaferrites composites in the frequency range of 0.1–18 GHz

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Enhanced microwave absorption properties of Y‐Co₂Z/PANI hexaferrites composites in the frequency range of 0.1–18 GHz