Thermomagnetometric analysis of lithium ferrites

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

doi:10.1007/s10973-018-7678-9

Cited by 10 publications

(4 citation statements)

References 19 publications

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“…The TG curves measured using a magnetic field show an abrupt increase in mass near the Curie temperature (T c ), which can be determined from the DTG curves. The T c for samples S1 and S2 attains 629.2 and 629.7 °C, respectively, and these values are close to the temperature of the magnetic transition in ordered lithium ferrite with T c = 632 °C [26,68]. As reported in [72], a slight decrease in the Curie temperature of the samples can be associated with an increase in the degree of the order violation in the ferrite structure.…”

Section: Thermal Analysis Of Precursors and Synthesized Ferritessupporting

confidence: 73%

“…Figures 2b and 3b demonstrate the results of TG analysis of the samples, when the magnets were attached immediately after the sample heating mode in accordance with the scheme proposed in [68]. The TG curves measured using a magnetic field show an abrupt increase in mass near the Curie temperature (T c ), which can be determined from the DTG curves.…”

Section: Thermal Analysis Of Precursors and Synthesized Ferritessupporting

confidence: 63%

“…The heating rate was 10 °C min −1 . The formed phases of magnetic ferrite were additionally monitored by TG analysis in a magnetic field, the technique of which is described in [68,69].…”

Section: Methodsmentioning

confidence: 99%

“…Based on the results obtained, it is possible to estimate the content of lithium ferrite formed in the samples during thermal analysis. According to the thermomagnetometric methodology of ferrites presented in [68], the mass jump at the Curie temperature was observed to be 0.41% for pure lithium ferrite. As mentioned above, the enthalpy of α − Li 0.5 Fe 2.5 O 4 to β − Li 0.5 Fe 2.5 O 4 transition according to the DSC analysis for pure lithium ferrite is 12 J g −1 [26].…”

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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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 Ferritessupporting

confidence: 73%

Section: Thermal Analysis Of Precursors and Synthesized Ferritessupporting

confidence: 63%

Section: Methodsmentioning

confidence: 99%

Section: Thermal Analysis Of Precursors and Synthesized Ferritesmentioning

confidence: 99%

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