Magnetization study in solid state formation of lithium-titanium ferrites synthesized by electron beam heating

Суржиков, А. П.; Lysenko, Elena; Vlasov, V. A.; Малышев, А. В.; Vasendina, E. A.

doi:10.1016/j.matchemphys.2016.03.037

Cited by 6 publications

(3 citation statements)

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“…During synthesis, at x = 0.2, soft magnetic spinel ferrite of the Li 0.6 Fe 2.2 Ti 0.2 O 4 composition, is formed. In [ 44 ], it was shown that lithium-titanium ferrite synthesis can yield lithium ferrite in accordance with the reaction: Li 2 CO 3 + 5Fe 2 O 3 → 4Li 0.5 Fe 2.5 O 4 + CO 2 and substituted spinel phases of lithium-titanium ferrite with x ≠ 0.2. These spinel phases are typically transition products of the reaction; their concentration depends on the temperature-time treatment conditions.…”

Section: Resultsmentioning

confidence: 99%

“…In [ 44 ], it was shown that the lattice parameters of the Li 0.5 Fe 2.5 O 4 and Li 0.5(1+x) Fe 2.5−1.5x Ti x O 4 ferrite phases are similar, which causes the merge of the reflections in the diffraction patterns. Therefore, the total content of spinel ferrite phases formed during ferrite synthesis was analyzed by the XRD method.…”

Section: Resultsmentioning

confidence: 99%

“…The electron-beam heating method was used to synthesize ferrites of various compositions, including spinel lithium, lithium-zinc and manganese-zinc ferrites, and hexagonal ferrites [ 35 , 38 , 39 , 40 , 41 , 42 ]. In [ 43 , 44 , 45 ], it was shown that this heating method increases the rate of solid-phase interaction between the initial reagents, which significantly decreases the ferrite synthesis temperature. The results reported in [ 43 ] showed that the initial reagents mainly interact during nonisothermal heating of the samples within a very short time.…”

Section: Introductionmentioning

confidence: 99%

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

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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: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%