Structural and magnetic response of Mn substituted Co 2 Y-type barium hexaferrites

Adeela, N.; Khan, Maaz; Iqbal, Muhammad Aamir; Riaz, Saira; Han, Xiufeng; Ali, Hafiz T.; Javed, Khalid; Bukhtiar, I.; Maaz, K.; Naseem, Shahzad

doi:10.1016/j.jallcom.2016.06.239

Cited by 51 publications

(12 citation statements)

References 44 publications

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“…Structural parameters such as crystallite size, lattice constants (a and c), unit cell volume, X-ray density, and are calculated using the following Eqs. 1, 3, 4 and 5, respectively [26] where λ (1.54056 Å) is the X-ray wavelength, θ is the Bragg's angle, B is the full width at half maximum, and k is (1) Crystallite size = k BCos the Sherrer's constant. Line broadening due to instrument is subtracted from the peak width before calculating the crystallite size using the following Eq.…”

Section: Phase 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: Phase 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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“…In Z phase this behaviour is observed at room temperature, but single Z phase formation is still challenging. The magnetoelectric coupling and temperature range in Y-type hexaferrite can be improved by appropriate cation substitution and varying sintering conditions [7][8][9][10]. The crystal structure of Y-type hexaferrite belongs to the R-3m space group with hexagonal structure, and can be obtained with the piling up of S (Me 2 Fe 4 O 8 ) and T (BaFe 8 O 14 ) blocks along the c axis.…”

Section: Introductionmentioning

confidence: 99%

Broadband transverse susceptibility in multiferroic Y-type hexaferrite Ba0.5Sr1.5Co2Fe2O22

Hernández-Gómez

Martín-González

Torres

et al. 2019

Journal of Magnetism and Magnetic Materials

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Single phase multiferroics in which ordered magnetism and ferroelectricity coexist, are of great interest for new multifunctional devices, and among them Y-type hexaferrites are good candidates. Transverse susceptibility measurements, which have been proved to be a versatile tool to study singular properties of bulk and nanoparticle magnetic systems, have been carried out with a broadband system on polycrystalline Y type hexaferrites with composition Ba 0.5 Sr 1.5 Co 2 Fe 2 O 22 , optimal to exhibit multiferroic properties. In the temperature range 80-350 K transverse susceptibility measurements with DC fields up to ±5000 Oe reveal different behaviour depending on the sintering temperature. The thermal evolution of the anisotropy field peak exhibits four regions with different slopes: positive in 80-130 K, negative in 130-200 K, constant in 200-280 K and negative in 280-350 K, which can be considered a signature of spin transitions in this compound.

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“…The following equations were used to derive structural characteristics like crystallite size, lattice constants (a and c), as well as the c/a ratio [23,24] unit cell volume, and X-ray density [25,26], and porosity.…”

Section: Xrd Analysismentioning

confidence: 99%

“…The ionic radius of the Mn 2+ (0.83 Å) ion is greater than that of the Co 2+ (0.78 Å) ion. The c/a ratio, on the other hand, ranges from 7.367 to 7.381, indicating that it is within the range of Y-type hexagonal ferrites [23,27]. Because the Y-type hexagonal structure is made up of three overlapping T and S blocks and oxygen layers [3(TS)] [27], With a value of 3, Z stands for the effective number of molecules per unit cell.…”

Section: Xrd Analysismentioning

confidence: 99%

“…If the coercivity is high enough above 1.2 kOe, hexaferrites materials can be used in a perpendicular recording medium (PRM), which is a new approach in magnetic recording media Furthermore, if Hc > Mr/2, the materials are hard magnets, which could be bene cial for high-frequency uses, according to If Hc < Mr/2, the materials are magnetically semi-hard and are employed in information storage. Because all of the produced hexaferrites materials in this investigation had Hc > Mr/2, they could be useful for high-frequency uses [23,70].…”

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confidence: 99%

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Enhanced Structural, Dielectric, and Magnetic Properties of Mn-Yb-doped Y-type Hexaferrites

Nadeem

Khan

Buzdar

et al. 2022

Preprint

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This study aimed to determine the effect of Mn2+ and Yb3+ ions substitution on the structural, dielectric, morphological, and magnetic properties of CaBaCo2 − xMnxYbyFe12−yO22 where x = 0.00-0.1 and y = 0.00-0.01 Y-type hexagonal ferrites prepared by sol-gel auto combustion. For 6 hours, samples were calcined at 1050 degrees Celsius. X-ray diffraction (XRD) analysis was used to study the formation phase of Y-type hexaferrites. The calculated structural auxiliary parameters, such as lattice constants (a and c), cell volume (Vcell), X-ray density (dx), bulk density (db), and porosity (P), were found to be within the following ranges: a = 5.891 to 5.9Å, c = .43.466 to 43.543Å, Vcell 1310.53 to 1312.26Å3, dx = 5.01 to 5.05(g/cm− 1) db = 2.622 to 3.032 (g/cm− 1)and P = 39.969 to 47.665%. The location of the ions, including their respective bonds, inside the structure of the lattice matrix, was revealed by Fourier-transform infrared spectroscopy (FTIR). SEM pictures confirmed the plate-like shape of the particles, confirming the XRD findings. In the dielectric analysis, the typical dielectric response of ferrites was observed. Grain contribution is low when compared to grain boundaries contribution The generated Y-type hexaferrites samples' multidomain magnetic nature resulted in domain wall displacement, which affects the coercivity values. A vibrating sample magnetometer was used to investigate magnetic characteristics (VSM). The saturation magnetization (Ms), Retentivity (Mr), and coercivity (Hc) of the material were found to be 4.11 to 2.21 emu/g, 2.33 to 1.22emu/g, and 1776.78 to 2283,51Oe, respectively. These powders can be used as pre-eminent contender materials for perpendicular recording media (PMR) applications. Corresponding Author’s E-mail: hmkhan@iub.edu.pk

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Structural and magnetic response of Mn substituted Co 2 Y-type barium hexaferrites

Cited by 51 publications

References 44 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

Broadband transverse susceptibility in multiferroic Y-type hexaferrite Ba0.5Sr1.5Co2Fe2O22

Enhanced Structural, Dielectric, and Magnetic Properties of Mn-Yb-doped Y-type Hexaferrites

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