Physical and electromagnetic properties of nanosized Gd substituted Mg–Mn ferrites by solution combustion method

Lwin, Nilar; Fauzi, M.N. Ahmad; Sreekantan, Srimala; Othman, Radzali

doi:10.1016/j.physb.2015.01.001

Cited by 41 publications

(13 citation statements)

References 15 publications

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“…Consequently, the grain size decreases with an increasing concentration of Gd [32,37,41]. The Gd-substituted samples show dark ferrite matrix grains and whitish grains due to biphasic microstructure (the second phase) already reported [30,42,43]. Whitish grains confirm the presence of Gadolinium at grain boundaries forming GdFeO3 [43].…”

Section: Scanning Electron Microscopy (Sem) Analysismentioning

confidence: 51%

“…It has been reported earlier that small amount of rare-earth ions incorporated in the ferrite favor the formation of the secondary phases associated with modifications in the magnetic properties [45]. The increase in coercivity with increase in Gd content has already been reported in the Gd substituted ferrites [30]. With increase in the substitution of Gadolinium, the surplus Gd 3+ ions form a secondary phase at grain boundaries.…”

Section: Quantitative Analysis (Edx)mentioning

confidence: 78%

“…The average grain size decreases in the range of 0.76 to 0.18 µm depending upon the substituted amount of cations (Table I). It is also obvious from these micrographs that as Gd content increased in the spinel lattice, the grain size became smaller for the substituted samples [30,31,40]. This may be attributed to the mobility of the grain boundaries, as the close proximity of the Gd ions potentially hinder grain boundary movement.…”

Section: Scanning Electron Microscopy (Sem) Analysismentioning

confidence: 89%

“…2. It can be seen that all the samples exhibit cubic spinel structure as a major phase and GdFeO3 as a secondary phase (denoted by asterisk in the XRD patterns) [30]. The lattice constant 'a' for the un-substituted ferrite sample is larger than the substituted one [31].…”

Section: Structural Analysismentioning

confidence: 96%

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Microwave absorption properties of CoGd substituted ZnFe2O4 ferrites synthesized by co-precipitation technique

Hussain

Misbah-ul-Islam

Meydan

et al. 2018

Ceramics International

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A series of co-precipitated Zn1-xCoxGdyFe2-yO4 spinel ferrites (x=0.0-0.5, y=0.00-0.10) sintered at 1000 o C were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), vibrating sample magnetometery (VSM) and microwave cavity perturbation (MCP). XRD patterns and FTIR spectra reveal formation of the spinel phase along with few traces of GdFeO3 second phase. The lattice constant decreases with an increasing amount of CoGd ions due to the segregation of Gd 3+ on the grain boundaries and due to replacement of lager Zn 2+ ions with smaller Co 2+ ions. SEM shows grain size to decrease with the increase of CoGd contents due to grain growth inhibition by the second phase. VSM results show remanence and saturation magnetization to exhibit an increasing trend due to Co substitution on octahedral sites and presence of a second phase. The coercivity increases with the increase of CoGd contents due to anisotropic nature of Co. MCP shows the complex magnetic permeability to increase with CoGd concentration while the complex permittivity decreases.

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Section: Scanning Electron Microscopy (Sem) Analysismentioning

confidence: 51%

Section: Quantitative Analysis (Edx)mentioning

confidence: 78%

Section: Scanning Electron Microscopy (Sem) Analysismentioning

confidence: 89%

Section: Structural Analysismentioning

confidence: 96%

See 2 more Smart Citations

Microwave absorption properties of CoGd substituted ZnFe2O4 ferrites synthesized by co-precipitation technique

Hussain

Misbah-ul-Islam

Meydan

et al. 2018

Ceramics International

View full text Add to dashboard Cite

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“…The influences of rare-earth oxides doping on various ferrites such as manganese ferrite, Mg-Zn ferrite, Ni-Zn ferrite and Mn-Zn ferrite had been investigated. [16][17][18] However, the dependences of the rare earth doping on the soft magnetic properties of Mn-Zn ferrites have not been fully understood, yet. In this work, we use industrial pre-sintered powders as the raw materials, and prepare Mn-Zn ferrites with different Sm 2 O 3 , Gd 2 O 3 , Ce 2 O 3 or Y 2 O 3 doping concentrations by traditional ceramic technology.…”

Section: Introductionmentioning

confidence: 99%

Improving soft magnetic properties of Mn-Zn ferrite by rare earth ions doping

et al. 2017

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Mn-Zn ferrites doped with different Sm 2 O 3 , Gd 2 O 3 , Ce 2 O 3 or Y 2 O 3 were prepared by traditional ceramic technology using industrial pre-sintered powders. A small amount of Sm 2 O 3 , Gd 2 O 3 , Ce 2 O 3 or Y 2 O 3 can significantly improve the microstructure and magnetic properties. The single spinel phase structure can be maintained with the doping amount up to 0.07 wt.%. A refined grain structure and uniform grain size distribution can be obtained by doping. For all rare earth oxides, a small amount of doping can significantly increase the permeability and reduce the coercivity and magnetic core loss. The optimized doping amount for Sm 2 O 3 or Gd 2 O 3 is 0.01 wt.%, while for Ce 2 O 3 or Y 2 O 3 is 0.03 wt.%. A further increase of the doping content will lead to reduced soft magnetic properties. The ferrite sample with 0.01 wt.% Sm 2 O 3 exhibits the good magnetic properties with permeability, loss, and coercivity of 2586, 316 W/kg, and 24A/m, respectively, at 200 mT and 100 kHz. The present results indicate that rare earth doping can be suggested to be one of the effective ways to improve the performance of soft ferrites.

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