Analysis of phase composition of LiZn and LiTi ferrites by XRD and thermomagnetometric analysis

Lysenko, Elena; Astafyev, A L; Vlasov, V. A.; Суржиков, А. П.

doi:10.1016/j.jmmm.2018.06.010

Cited by 14 publications

(7 citation statements)

References 19 publications

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“…Thus, the formation of lithium-titanium ferrite is more intensive during synthesis of samples from mechanically activated powders. In this case, samples mechanically activated at 2220 rpm and synthesized by electron-beam heating show a Curie temperature of 534 °C, which is like that for the T C of Li 0.6 Fe 2.2 Ti 0.2 O 4 ferrite [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

“…Table 1 and Table 2 present XRD and other data for the spinel phase synthesized within 120 min in different samples. The lattice parameter for this phase synthesized in powdered and compacted samples is about 8.33 Ǻ. Lithium ferrite of the Li 0.5 Fe 2.5 O 4 composition [ 47 ] exhibits this value of the lattice parameter. It is known that at increased titanium content in the spinel phase, the lattice parameter increases and amounts to 8.335 Ǻ for Li 0.6 Fe 2.2 Ti 0.2 O 4 ferrite [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

“…The lattice parameter for this phase synthesized in powdered and compacted samples is about 8.33 Ǻ. Lithium ferrite of the Li 0.5 Fe 2.5 O 4 composition [ 47 ] exhibits this value of the lattice parameter. It is known that at increased titanium content in the spinel phase, the lattice parameter increases and amounts to 8.335 Ǻ for Li 0.6 Fe 2.2 Ti 0.2 O 4 ferrite [ 47 ]. Therefore, the values obtained for the lattice parameter of the spinel phase in mechanically activated samples most likely evidence the formation of titanium-substituted lithium ferrites.…”

Section: Resultsmentioning

confidence: 99%

“…A thermomagnetometric (TM) analysis was performed to estimate the Curie temperature of the synthesized samples. As reported in [ 47 ], the XRD and TM data can be used to estimate the complete phase composition of ferrites more accurately.…”

Section: Resultsmentioning

confidence: 99%

“…The Curie temperature depends on the rotation speed of mechanical grinding. Variation in the Curie temperature corresponds to the formation of lithium-titanium ferrites with different titanium substitutions [ 47 ]. Thus, the formation of lithium-titanium ferrite is more intensive during synthesis of samples from mechanically activated powders.…”

Section: Resultsmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%