Synthesis and Properties Investigation of Non-equivalent Substituted W-Type Hexaferrite

Guo, Fengying; Wu, Xiaomin; Ji, Guijuan; Xu, Jing; Zou, Lianchun; Gan, Shucai

doi:10.1007/s10948-013-2276-3

Cited by 15 publications

(3 citation statements)

References 24 publications

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“…O 27 . 44 On the other hand, the samples with Nd-Zn substitutions exhibited the lowest values of the saturation magnetization (71.9 to 73.2 emu/g) compared with the other substitutions; these values are still in good agreement with those of Co 2 W. 30,45 The increase of the saturation magnetization with RE-Zn substitution could be due to the preferential substitution of Fe 3+ ions by nonmagnetic Zn 2+ ions at spin-down sites. and experimental conditions, leading to different microstructures which play a key role in the coercivity.…”

Section: +mentioning

confidence: 84%

Structural, Vibrational, and Electronic Properties of Trigonal Cu2SrSnS4 Photovoltaic Absorber from First-Principles Calculations

Ramkumar

2020

Mat. Sci. Res. India

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In the search for sustainable alternate absorber materials for photovoltaic applications, the family of chalcogenides provide a promising solution. While the most commonly studied Cu2ZnSnS4 based kesterite solar cells seem to have intrinsic drawbacks such as low-efficiency arising from defects and anti-disorder in the Cu-Zn sites, substituting other elements in the Cu/Zn sites have been considered. In this direction, Cu2(Ba,Sr)SnS4 provide an interesting alternative as they possibly help limit the intrinsic anti-site disorder in the system which is of primary concern with regard to efficiency loses. In this study, we report the structural, vibrational, and electronic properties of trigonal structured Cu2SrSnS4 quarternary system computed from first-principles density functional theory paving way for further characterization and analysis within this class of materials.

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Section: +mentioning

confidence: 84%

Structural, Vibrational, and Electronic Properties of Trigonal Cu2SrSnS4 Photovoltaic Absorber from First-Principles Calculations

Ramkumar

2020

Mat. Sci. Res. India

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“…To compensate for the charge, some Fe 3+ ions get converted into Fe 2+ ions. The magnetic moment of Fe 3+ and Fe 2+ are 5 and 4 μ B , respectively [42,43]. The 12k and 2a sites are linked through superexchange interaction (Fe 3+ -O 2 -Fe 3+ ).…”

Section: Resultsmentioning

confidence: 99%

Comparative study of structural and magnetic properties of Ni and La substituted calcium hexaferrite

Shinde¹,

Dahotre

2021

Cerâmica

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Ni and La substituted M-type Ca hexaferrite of composition CaNi 1 Fe 11 O 19 and CaLa 1 Fe 11 O 19 were synthesized by sol-gel auto combustion method using metal nitrates as oxidants and citric acid as reducing agent. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), energy dispersive X-ray analysis (EDAX), and vibrating sample magnetometry (VSM). XRD study revealed that both samples had lattice parameters a and c within the range of M-type hexaferrite. The SEM micrographs displayed grains having irregular shapes and sizes in the nanometer range. FTIR peaks confirmed the structure of M-type hexaferrite. EDAX spectra showed the homogeneous distribution of ions in both samples. In CaNi 1 Fe 11 O 19 , we found saturation magnetization (M s ) of 12.18 emu/g and coercivity (H c ) of 193.2 Oe. On the other hand, in CaLa 1 Fe 11 O 19 , we found M s of 0.55 emu/g and H c of 404.4 Oe. Saturation magnetization and coercivity values obtained for La substituted M-type Ca hexaferrite are suitable for low-density magnetic recording devices.

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“…[1][2][3][4][5][6] In the recent years, a number of researchers have attempted the substitution of divalent ions, trivalent ions and their binary mixture in order to alter the structural, electrical and magnetic properties of W-type hexaferrites. 7,8 The crystal structure of W-type hexagonal ferrites is very complex and can be considered as a superposition of R and S blocks along the hexagonal axis with a structure of RSSR*S*S*, where R is a three-oxygen-layer block with composition BaFe 6 O 11 , S (spinel block) is a two-oxygen-layer block with composition Fe 6 O 8 and the asterisk means that the corresponding block has been turned 180 • around the hexagonal axis. 9 W-type * Author for (correspondence sharbati_ali@yahoo.com) hexaferrites continues to be very attractive materials for home appliances, electronic products, communication equipments and data processing devices because of their unique electrical and magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Influence of dysprosium addition on the structural, morphological, electrical and magnetic properties of nano-crystalline W-type hexaferrites

et al. 2015

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Dysporium (Dy)-substituted W-type barium hexaferrites were prepared by the citrate sol-gel-method. Crystalline structure, morphology, magnetic properties, DC resistivity and microwave absorption properties of BaNi 2 Dy x Fe 16−x O 27 (x = 0-0.9) were studied using X-ray diffraction, transmission electron microscope (TEM), vibrating sample magnetometer and vector network analyzer and sensitive source meter, respectively. Single-phase W-type barium hexaferrites, with a chemical composition of BaNi 2 Dy x Fe 16−x O 27 (x = 0-0.9), were formed by being heated at 1250 • C for 4 h in air. The magnetic properties such as saturation magnetization (M s ), and coercivity (H c ) were calculated from hysteresis loops. Hysteresis loop measurements show that the coercivity values lie in the range of 530-560 Oe with increasing Dy content. It was also observed that magnetization decreases with the increase of Dy content. The DC resistivity was observed to increase from 0.83 × 10 7 to 6.92 × 10 7 cm with increasing Dy contents due to the unavailability of Fe 3+ ions. Microwave absorption properties of hexaferrite (70 wt%)-acrylic resin (30 wt%) composites were measured by the standing-wave-ratio (SWR) method in the range from 12 to 20 GHz. For sample with x = 0.6, a minimum reflection loss of −40 dB was obtained at 16.2 GHz for a layer of 1.7 mm in thickness. Sample with x = 0.9 had wide bandwidth absorption in the frequency range of 13.5-18 GHz with reflection losses less than −15 dB. Meanwhile the minimum reflection point shifts toward higher frequency with the increase of Dy content.

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Synthesis and Properties Investigation of Non-equivalent Substituted W-Type Hexaferrite

Cited by 15 publications

References 24 publications

Structural, Vibrational, and Electronic Properties of Trigonal Cu2SrSnS4 Photovoltaic Absorber from First-Principles Calculations

Structural, Vibrational, and Electronic Properties of Trigonal Cu2SrSnS4 Photovoltaic Absorber from First-Principles Calculations

Comparative study of structural and magnetic properties of Ni and La substituted calcium hexaferrite

Influence of dysprosium addition on the structural, morphological, electrical and magnetic properties of nano-crystalline W-type hexaferrites

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