Thermal analysis study of solid-phase synthesis of zinc- and titanium-substituted lithium ferrites from mechanically activated reagents

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

doi:10.1007/s10973-015-4849-9

Cited by 18 publications

(4 citation statements)

References 21 publications

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“…2a and 3a at 470-700 °C are associated with the formation of transition phases of lithium ferrite. This is evidenced by a small peak on the DSC curve at 750-760 °C, which is due to the order-disorder (α → b) phase transition in the formed Li 0.5 Fe 2.5 O 4 phase [18,72]. The higher enthalpy of 0.96 J g −1 for sample S1 compared to the value of 0.42 J g −1 for sample S2 characterizes the higher ferrite content in sample S1 synthesized at the time of recording the DSC signal.…”

Section: Thermal Analysis Of Precursors and Synthesized Ferritesmentioning

confidence: 98%

“…It is known [18,19] that mixing lithium carbonate with metal oxides accelerates the process of its decomposition. In particular, in a mixture with Fe 2 O 3 , acceleration of the which is at least 250 °C lower than that for pure Li 2 CO 3 .…”

Section: Thermal Analysis Of Precursors and Synthesized Ferritesmentioning

confidence: 99%

“…However, a solid-state method using oxides and carbonates is most widespread for producing lithium ferrites [16,17]. Here, mechanical activation of the initial oxides can significantly accelerate and reduce the temperature of ferrite synthesis [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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TG, DSC, XRD, and SEM studies of the substituted lithium ferrite formation from milled Sm2O3/Fe2O3/Li2CO3 precursors

Lysenko

Vlasov²,

Nikolaeva³

et al. 2022

J Therm Anal Calorim

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Formation of substituted lithium ferrite Li 0.5 Sm x Fe 2.5-x O 4 (where x = 0.06 and 0.2) from Sm 2 O 3 /Fe 2 O 3 /Li 2 CO 2 precursors was studied by X-ray diffraction analysis, thermogravimetry, differential scanning calorimetry, and scanning electron microscopy. The mixture of powders was subjected to preliminary mechanical activation in a planetary mill. We analyzed samples based on the precursors and synthesized at 900 °C for 4 h in a laboratory furnace. It was found that ball milling of the precursors mixture in a planetary mill increases the powder reactivity. In spite of this, no substituted lithium ferrites were formed. It was shown that a two-phase composite that consists of pure lithium ferrite Li 0.5 Fe 2.5 O 4 and SmFeO 3 is formed during synthesis. An increase in the Sm 2 O 3 content in the initial mixture provides an increase in the amount of the formed SmFeO 3 phase. The synthesis of Li 0.5 Fe 2.5 O 4 ferrite was confirmed by XRD analysis data, the Curie temperature (627-630 °C) measured using TG analysis in a magnetic field, and by the presence of an endothermic peak on the DSC curve corresponding to the order-disorder transition in the Li 0.5 Fe 2.5 O 4 phase.

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Section: Thermal Analysis Of Precursors and Synthesized Ferritesmentioning

confidence: 98%

Section: Thermal Analysis Of Precursors and Synthesized Ferritesmentioning

confidence: 99%

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TG, DSC, XRD, and SEM studies of the substituted lithium ferrite formation from milled Sm2O3/Fe2O3/Li2CO3 precursors

Lysenko

Vlasov²,

Nikolaeva³

et al. 2022

J Therm Anal Calorim

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“…Previously, we also studied the formations of Li, LiZn and LiTi ferrites [28][29][30] at solid-state synthesis. It was shown that pure lithium ferrite synthesized from powders milled at 2220 rpm is characterized by the presence of α-Li0.5Fe2.5O4 phase.…”

Section: Introductionmentioning

confidence: 99%

XRD Analysis of LiFeO2 Formation from Li2CO3-Fe2O3 Mechanically Activated Reagents

Lysenko

Vlasov

Суржиков

et al. 2022

MSF

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The formation of LiFeO2 lithium ferrite from unmilled and milled Fe2O3-Li2CO3 mixture was studied by X-ray powder diffraction (XRD). The ball milling was perform via AGO-2S high-energy planetary ball mill at a rotational speed of 2220 rpm for 60 min. Solid-phase synthesis was carried out by conventional laboratory furnace at 600 °C. Using PowderCell 2.4 software, the structural parameters of the reagents and ferrite obtained from these were determined. According to the XRD data, the crystallite sizes of the milled reagents decreased, while the strains increased. It was found that the synthesized ferrite is characterized by multiphase composition consisting of unreacted initial reagents, α-LiFeO2, γ-LiFeO2 and α-Li0.5Fe2.5O4 phases, the concentration of which depends on the prehistory of the mixture.

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The Influence of Thermomagnetometric Measurement Conditions on the Recorded Curie Temperature of Cobalt-Zinc Ferrite

Nikolaev,

Lysenko,

Surzhikov

et al. 2023

Engineering Materials

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Thermal analysis study of solid-phase synthesis of zinc- and titanium-substituted lithium ferrites from mechanically activated reagents

Cited by 18 publications

References 21 publications

TG, DSC, XRD, and SEM studies of the substituted lithium ferrite formation from milled Sm2O3/Fe2O3/Li2CO3 precursors

TG, DSC, XRD, and SEM studies of the substituted lithium ferrite formation from milled Sm2O3/Fe2O3/Li2CO3 precursors

XRD Analysis of LiFeO<sub>2</sub> Formation from Li<sub>2</sub>CO<sub>3</sub>-Fe<sub>2</sub>O<sub>3 </sub>Mechanically Activated Reagents

The Influence of Thermomagnetometric Measurement Conditions on the Recorded Curie Temperature of Cobalt-Zinc Ferrite

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