The influence of TiO2 polymorph, mechanical milling and subsequent sintering on the formation of Ti-substituted spinel-related Li0.5Fe2.5O4

Widatallah, H. M.; Ren, Xiaolin; Al‐Omari, I. A.

doi:10.1007/s10853-006-0721-4

Cited by 29 publications

(7 citation statements)

References 18 publications

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“…In addition, at increased grinding energy intensity, the content of the magnetic phase in the samples grew. In this case, the samples mechanically activated at 2220 rpm and synthesized by electron-beam heating show a high magnetization value of 50 emu/g, which is like the data reported in [ 24 , 45 ]. This is related to the decreased particle size and increased inter-particle contact area caused by mechanical treatment, which increases the rate of ferrite formation.…”

Section: Resultssupporting

confidence: 85%

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Technological Aspects of Lithium-Titanium Ferrite Synthesis by Electron-Beam Heating

et al. 2023

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Solid-phase synthesis of lithium-titanium ferrite by electron-beam heating of a Fe2O3–Li2CO3–TiO2 initial reagents mixture with different history (powder, compact, mechanically activated mixture) was studied using X-ray diffraction, thermomagnetometric and specific saturation magnetization analyses. Ferrite was synthesized using an ILU-6 pulsed electron accelerator; it generated electrons with electron energy of 2.4 MeV to heat samples to temperatures of 600 and 750 °C. The isothermal holding time upon reaching the synthesis temperature was 0–120 min. The efficiency of ferrite synthesis by electron-beam heating was evaluated via comparison of the characteristics of the obtained samples with those synthesized by conventional ceramic technology under similar temperature-time conditions. It was found that the rate of ferrite formation depends on the heating method, temperature, synthesis time, density, and activity of the initial mixture. It was shown that sample compaction provides the preferential formation of unsubstituted lithium ferrite of Li0.5Fe2.5O4 composition with a Curie temperature of at ca. 630 °С in both synthesis methods. High-energy electron-beam heating of the mechanically activated mixture significantly accelerates synthesis of Li0.6Fe2.2Ti0.2O4 substituted ferrite, for which the Curie temperature and specific saturation magnetization were recorded as 534 °С and 50 emu/g, respectively. Therefore, LiTi ferrites can be obtained at a lower temperature (750 °C) and with a shorter synthesis time (120 min) compared to traditional ceramic technology.

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Section: Resultssupporting

confidence: 85%

“…This problem can be partially solved by mechanical milling of the initial reagents in a ball mill [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ]. Such treatment reduces the size of the powder particles and simultaneously increases imperfection of the powders, which enhances the reactive activity of the reagents.…”

Section: Introductionmentioning

confidence: 99%

Technological Aspects of Lithium-Titanium Ferrite Synthesis by Electron-Beam Heating

et al. 2023

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“…Besides, YIG nanoparticles have recently found applications in fields such as magneto-optical recording [5]. Among the many preparation routes for ferrites nanoparticles, ball milling is known to be a powerful method [4,[7][8][9]. Of particular interest is the work by Paesano and co-workers [4] who reported that ball milling a 3:5 molar mixture of Y 2 O 3 and α-Fe 2 O 3 lowers the onset temperature at which YIG forms to 1,100 • C [4].…”

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confidence: 99%

A structural and Mössbauer study of Y3Fe5O12 nanoparticles prepared with high energy ball milling and subsequent sintering

et al. 2008

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The influence of ball milling and subsequent sintering of a 3:5 molar mixture of Y 2 O 3 and α-Fe 2 O 3 on the formation of nanocrystalline Y 3 Fe 5 O 12 (YIG) particles is studied. Pre-milling the mixture for 100 h lowers the onset temperature at which the material forms to 900 • C which is 200 • C lower than that reported when a similar mixture of reactants was premilled for shorter times. A single-phased nanocrystalline Y 3 Fe 5 O 12 phase develops as a sole product when the pre-milled mixture is heated at 1,000 • C (12 h). This temperature is ∼300-400 • C lower than those used to prepare the material conventionally. The bulk and surface crystal structure of the nanoparticles is studied with X-ray diffraction, Mössbauer spectroscopy, Atomic Force Microscope (AFM) and X-ray photoelectron spectroscopy.

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“…MA can be used to produce a variety of advanced materials, including amorphous alloy powders, nanocrystalline powders, intermetallic powders, composite and nanocomposite powders, and nanopowders [33]. Several authors pointed that it is possible to synthesize nanostructured lithium ferrite at a lower temperature by applying the ball milling process [34,35].…”

Section: Introductionmentioning

confidence: 99%

Effect of Composition on Structural and Magnetic Properties of Nanocrystalline Ferrite Li0.5Sm x Fe2.5–x O4

Mahmoudi

Kavanlouei

Maleki-Ghaleh

2015

Powder Metall Met Ceram

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The effect of Sm content Li 0.5 Sm x Fe 2. 5-x O 4 (x = 0, 0.05, 0.1, and 0.2) and sintering temperature on the phase evolution, microstructure, and bulk magnetic properties of lithium ferrite prepared by mechanical alloying is investigated. XRD results of pure samples confirmed that the single ferrite phase is formed after sintering at 800°C; however, increasing of samarium content led to the formation of secondary phase (SmFeO 3 ) and enhanced intensity. The bulk magnetic properties decreased with increase Sm content and increased with sintering temperatures. Single-phase ferrites Li 0.5 Sm x Fe 2.5-x O 4 were produced by sintering of sample at 800°C, which is lower than the temperature associated with the conventional ceramic procedure.

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The influence of TiO2 polymorph, mechanical milling and subsequent sintering on the formation of Ti-substituted spinel-related Li0.5Fe2.5O4

Cited by 29 publications

References 18 publications

Technological Aspects of Lithium-Titanium Ferrite Synthesis by Electron-Beam Heating

Technological Aspects of Lithium-Titanium Ferrite Synthesis by Electron-Beam Heating

A structural and Mössbauer study of Y3Fe5O12 nanoparticles prepared with high energy ball milling and subsequent sintering

Effect of Composition on Structural and Magnetic Properties of Nanocrystalline Ferrite Li0.5Sm x Fe2.5–x O4

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