Structure and magnetic analyses of hexaferrite Sr1−xLaxFe22+Fe163+O27 prepared via the solid-state reaction

Tang, Jin; Liu, Xiansong; Li, Dan; Yang, Yujie; Kan, Xucai; Rehman, Khalid Mehmood Ur

doi:10.1007/s10854-018-0291-7

Cited by 8 publications

(1 citation statement)

References 43 publications

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“…Replacing Ba 2+ with smaller La 3+ and Sr 2+ will reduce the lattice constant, thereby reducing the distance of Fe-O parallel to the c-axis, strengthening the superexchange interaction and thus increasing Ms. In addition, the increase in internal stress caused by lattice distortion enhances the magnetic interaction in the sublattice, which also increases the magnetization strength [18]. The grain size affects the coercivity of the material.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Absorption Band Tunable La-Sr Co-Doped BaCo2-W Type Hexaferrites

Li,

Sun

2023

Materials

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La-Sr co-doped Ba1−x(La0.5Sr0.5)xCo2Fe16O27 (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0, respectively) hexaferrites were prepared by the solid-state method. W-type hexaferrite single phase structure with space group P63/mmc was obtained when the doping amount was x < 0.4 and an M-type hexaferrite and a spinel phase with smaller grains gradually replaced the W phase as the primary phases when x ≥ 0.6. The maximum Ms is 76.2 emu/g and the minimum Hc is 60 Oe at x = 0.4, as obtained by VSM analysis. The magnetoelectric properties of the samples were tested at 1–18 GHz with a vector network analyzer and the reflection loss was calculated based on transmission line theory. It was found that the introduction of an appropriate amount of La-Sr provides a large number of porosity defects while increasing the grain size, which can effectively improve the reflection of electromagnetic waves inside the material and dissipate more energy. At the same time, co-doping also makes the resonance frequency of the samples shift to lower frequency, resulting in tunable absorption properties in the C, X and Ku bands. When x = 0.2, the minimum reflection loss is −40.61 dB at 1.5 mm thickness, with the effective absorption bandwidth of 5.76 GHz in the X band; when x = 0.4, the minimum reflection loss is −37.45 dB at 2.5 mm, with the bandwidth of 4.97 GHz in the C band; when x = 0.6, the material has good absorption in both the X and Ku bands with the thickness less than 2 mm. The simple preparation method and good performance make La-Sr co-doped Co2W ferrite a promising microwave absorbing material.

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Section: Magnetic Propertiesmentioning

confidence: 99%

Absorption Band Tunable La-Sr Co-Doped BaCo2-W Type Hexaferrites

Li,

Sun

2023

Materials

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Gadolinium-Doped Iron Nanostructures Decorated with Novel Drugs for Magnetic Resonance Imaging, Photodynamic, and Photothermal Therapy Applications

Fakhar-e-Alam

Mahmood²,

Nasır³

et al. 2020

Magnetic Nanoheterostructures

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Multidrug drug resistance (MDR) builds many limitations/troubles/problems in magnetic resonance imaging (MRI) and treatment techniques. In this strategy, novel idea of polyethylene glycol/polyacrylic acid (PEG-co-PAA)-decorated gadolinium-doped iron was employed for cancer diagnostics and therapy purposes. In real sense, multifarious/various morphology of Gd-doped Fe-NMPs was found to be useful in versatile format of biomedical applications. Schematic of ongoing experimental strategy illustrates that three efficient photosensitizers, e.g., chlorine e6, Foscan ® , and 5-ALA were decorated with Gd-doped iron capsulated with PEG-co-PAA such that their size/morphology consists within range of 100-120 nm of nanospheres. Final form of this nanospheres/nanocapsule plays a vital role through synergistic response of mutual plasmonic reaction of drug decorated nanocapsule. One of the prime M. Fakhar-e-Alam (B) • A. Mahmood (B)

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