Curie temperature and magnetic properties of aluminum doped barium ferrite particles prepared by ball mill method

Chen, Daming; Harward, Ian; Baptist, Joshua; Goldman, S.; Celiński, Z.

doi:10.1016/j.jmmm.2015.07.076

Cited by 28 publications

(9 citation statements)

References 13 publications

(8 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

View full text Add to dashboard Cite

show abstract

“…The spontaneous formation of the magnetic phase within the ferroelectric matrix ensures the chemical compatibility of the different phases, an important and well-known issue in composites [ 21 , 22 ]. Another important aspect of these TTB-Ln/BaFO multiferroic composites is their high ferroelectric and magnetic Curie temperatures, estimated, respectively, at ≈440 K [ 17 ] and ≈800 K [ 23 , 24 ]. In addition, the ˋhardˊ magnetic BaFO phase is very well known and studied as it is used in several applications, including magnetic recording and microwave applications [ 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetoelectric Coupling in Room Temperature Multiferroic Ba2EuFeNb4O15/BaFe12O19 Epitaxial Heterostructures Grown by Laser Ablation

2023

View full text Add to dashboard Cite

Multiferroic thin films are a promising class of multifunctional materials, since they allow the integration of multiple functionalities within a single device. In order to overcome the scarcity of single phase multiferroics, it is crucial to develop novel multiferroic heterostructures, combining good ferroelectric and ferromagnetic properties as well as a strong coupling between them. For this purpose, Ba2EuFeNb4O15/BaFe12O19 multiferroic magnetoelectric bilayers have been epitaxially grown on niobium doped SrTiO3 (100) single crystal substrates by pulsed laser deposition. The simultaneous presence of both ferroelectric and magnetic properties—due, respectively, to the Ba2EuFeNb4O15 and BaFe12O19 components—was demonstrated at room temperature, attesting the multiferroic nature of the heterostructure. More interestingly, a strong magnetoelectric coupling was demonstrated (i) by manipulating the ferroelectric properties via an external magnetic field, and conversely, (ii) by tuning the magnetic properties via an external electric field. This strong magnetoelectric coupling shows the high interdependence of both ferroic orders in the Ba2EuFeNb4O15/BaFe12O19 heterostructure, mediated by elastic (epitaxial) strain at the interfaces.

show abstract

“…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%

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

View full text Add to dashboard Cite

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.

show abstract

Curie temperature and magnetic properties of aluminum doped barium ferrite particles prepared by ball mill method

Cited by 28 publications

References 13 publications

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

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

Magnetoelectric Coupling in Room Temperature Multiferroic Ba2EuFeNb4O15/BaFe12O19 Epitaxial Heterostructures Grown by Laser Ablation

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

Contact Info

Product

Resources

About