A comparative study on the magnetic properties of MFe12O19 and MAlFe11O19 (M=Sr, Ba and Pb) hexaferrites with different morphologies

Singhal, Sonal; Namgyal, Tsering; Singh, Jagdish; Chandra, K.; Bansal, Sandeep

doi:10.1016/j.ceramint.2011.02.001

Cited by 104 publications

(26 citation statements)

References 15 publications

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“…After complete dissolution, citric acid solution was poured onto the metal precursors followed by polyvinyl alcohol (PVA, 2 g/90 ml) addition whilst stirring. PVA plays many crucial roles in synthesizing nanoferrites including control of the nanoparticles growth, prevention of agglomeration and production of nanoparticles in uniform shapes [29]. Finally, FeCl 3 solution was poured onto the later mixture followed by stirring for 0.5 h.…”

Section: Catalyst Fabricationmentioning

confidence: 99%

Synthesis of magnetically recyclable spinel ferrite (MFe2O4, M = Zn, Co, Mn) nanocrystals engineered by sol gel-hydrothermal technology: High catalytic performances for nitroarenes reduction

Ibrahim

Othman

Bahgat

et al. 2016

Applied Catalysis B: Environmental

244

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Section: Catalyst Fabricationmentioning

confidence: 99%

Synthesis of magnetically recyclable spinel ferrite (MFe2O4, M = Zn, Co, Mn) nanocrystals engineered by sol gel-hydrothermal technology: High catalytic performances for nitroarenes reduction

Ibrahim

Othman

Bahgat

et al. 2016

Applied Catalysis B: Environmental

244

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“…All this make substituted barium hexaferrites promising for practical applications, such as radio-frequency absorbing coatings, magnetic recording, fabrication of permanent magnets and various components in microwave devices, telecommunication, etc. As a result, electromagnetic properties [19][20][21][22][23][24][25] and growth methods, such as sol-gel [26][27][28][29][30], co-precipitation [31,32] and the standard ceramic method [33,34], of these compounds are now under extensive investigations.…”

Section: Introductionmentioning

confidence: 99%

Influence of chemical substitution on broadband dielectric response of barium-lead M-type hexaferrite

Alyabyeva¹,

Torgashev²,

Жукова³

et al. 2019

New J. Phys.

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We report on the electrodynamic properties of the single crystalline lead-substituted M-type barium hexaferrite, Ba 0.3 Pb 0.7 Fe 12 O 19 , performed in the broad frequency range including radio-frequency, terahertz and sub-terahertz bands, which are particularly important for the development of microelectronic devices. We demonstrate how changing on a molecular level the chemical characteristics (composition, intermolecular interaction, spin-orbital interaction) of lead-substituted M-type hexaferrite influences its radio-frequency and terahertz electrodynamic response. Our results indicate a critical temperature range, 50 K<T<70 K, where significant changes of the electrodynamic response occur that are interpreted as freezing of dynamical oscillations of bi-pyramidal Fe(2b) ions. In the range 5-300 K, the heat capacity shows no sign of any phase transition and is solely determined by electron and phonon contributions. An anomalous electrodynamic response is detected at 1-2 THz that features a rich set of absorption resonances which are associated with electronic transitions within the fine-structured Fe 2+ ground state and are visualized in the spectra due to magnetostriction and electron-phonon interaction. We show that lead substitution of barium in barium hexaferrite, BaFe 12 O 19 , leads to the emergence of a pronounced dielectric and magnetic relaxational dynamics at radio-frequencies and that both dynamics have the same characteristic relaxation times, thus evidencing the bi-relaxor-like nature of Ba 0.3 Pb 0.7 Fe 12 O 19 . We associate the origin of the relaxations as connected with the motion of magnetic domain walls. In order to unveil crucial influence of chemical substitution on electrodynamic characteristics of the compound, we analyze our results on substituted compound in comparison with the data available for pristine barium (BaFe 12 O 19 ) and pristine lead (PbFe 12 O 19 ) hexaferrites. The obtained spectroscopic data on the dielectric properties of Ba 0.3 Pb 0.7 Fe 12 O 19 provide insight into fundamental phenomena responsible for the absorption mechanisms of the compound and demonstrates that chemical ionic substitution is an effective tool to tune the dielectric properties of the whole family of hexaferrites.

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“…BaM system retains hexagonal structure consists of a closepacked stacking of oxygen layers, with the iron (Fe) atoms distributed within three kinds of octahedral sites (12k, 2a and 4f2), one tetrahedral site (4f1), and one bi-pyramidal site (2b) which are coupled by super exchange interactions through the O 2 À ions [12]. The magnetic and electrical properties of the BaM system depend on the distribution of the cations in octahedral, tetrahedral and bipyramidal sites [12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Electric transport properties study of bulk BaFe12O19 by complex impedance spectroscopy

Pattanayak

Panigrahi

Dash

et al. 2015

Physica B: Condensed Matter

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A comparative study on the magnetic properties of MFe12O19 and MAlFe11O19 (M=Sr, Ba and Pb) hexaferrites with different morphologies

Cited by 104 publications

References 15 publications

Synthesis of magnetically recyclable spinel ferrite (MFe2O4, M = Zn, Co, Mn) nanocrystals engineered by sol gel-hydrothermal technology: High catalytic performances for nitroarenes reduction

Synthesis of magnetically recyclable spinel ferrite (MFe2O4, M = Zn, Co, Mn) nanocrystals engineered by sol gel-hydrothermal technology: High catalytic performances for nitroarenes reduction

Influence of chemical substitution on broadband dielectric response of barium-lead M-type hexaferrite

Electric transport properties study of bulk BaFe12O19 by complex impedance spectroscopy

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