Fabrication of PbFe12O19 nanoparticles and study of their structural, magnetic and dielectric properties

Ghahfarokhi, S. E. Mousavi; Rostami, Zohreh; Kazeminezhad, Iraj

doi:10.1016/j.jmmm.2015.09.063

Cited by 36 publications

(8 citation statements)

References 29 publications

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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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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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“…In order to study the structural, magnetic and dielectric properties of nanoparticles of PbM [51], the sol-gel method was used. The powders were calcined at 700 ºC, 750 ºC, 800 ºC, 850 ºC, 900 ºC, and 1000 ºC with 1 h, 1.5 h, 2 h, 2.5 h and 3 h. The best annealing temperature and time was 800 ºC and 3 h, respectively, to obtain pure PbM.…”

Section: Preparation Methodsmentioning

confidence: 99%

Lead Hexaferrite - A Brief Review

Palomares-Sánchez

2019

Engineering Magnetic, Dielectric and Microwave Properties of Ceramics and Alloys

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Lead hexaferrite belongs to the family of compounds with the chemical formula MFe 12 O 19 (M = Ca, Ba, Sr, Pb, La). One of the main reasons the lead hexaferrite has not been exhaustively studied is because its magnetic properties are inferior to barium and strontium hexaferrites. Few studies have been carried out after the description of its structure, in 1938; nevertheless, one of its advantages is that it can be prepared at lower temperatures than conventional reported ferrites and it is worth studying its properties when compared with other members of the family. Therefore, this work deals with a brief review of preparation methods, properties and applications of this compound.

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“…In papers by Tan et al [ 7 , 8 ], as well as in a number of other publications [ 9 , 10 , 11 , 12 , 13 ], lead hexaferrite was synthesized using “wet” chemistry methods. The use of low-temperature methods for its synthesis is justified by the need to preserve the final product stoichiometry, which may be disturbed during heat treatment due to the volatility of lead oxide.…”

Section: Introductionmentioning

confidence: 99%

“…According to one of the earliest of the above mentioned studies by Gajbhiye et al [ 9 ], single-phase lead hexaferrite can be obtained from citrate gel after firing at 500 to 800 °C; however, unfortunately, the authors provided no diffraction pattern of the obtained products. Ghahfarokhi et al [ 10 ] have shown that obtaining the desired product requires firing at a temperature of 850 °C; however, it contains an impurity of α-Fe 2 O 3 (~8%). At lower (700 to 800 °C), as well as at higher (900 to 1000 °C) temperatures, the amount of hematite in the samples is significantly higher and reaches ~20–50%.…”

Section: Introductionmentioning

confidence: 99%

Gel Synthesis of Hexaferrites Pb1−xLaxFe12−xZnxO19 and Properties of Multiferroic Composite Ceramics PZT–Pb1−xLaxFe12−xZnxO19

Lisnevskaya

Aleksandrova

2020

Nanomaterials

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We investigated the opportunities for obtaining hexaferrites Pb1−хLaхFe12−xZnxO19 (х = 0–1) from citrate–glycerin gel and showed that synthesis occurs via the formation of the Fe3O4 phase; products with a small amount of hematite impurity Fe2O3 can be obtained after firing at 800 to 900 °С with 0 £ х £ 0.5. If х > 0.5, perovskite-like LaFeO3 is formed in samples, so that if х = 0.9–1, the synthesis products virtually do not contain phases with hexaferrite structures and represent a mixture of LaFeO3, Fe2O3, and Fe3O4. Within the range of 0 £ х £ 0.5, the electrical and magnetic characteristics of hexaferrites Pb1–хLaхFe12−xZnxO19 are slightly dependent on х and have the following average values: A relative permittivity e/e0 ~45, a dielectric loss tangent tan d ~0.6, an electrical resistivity R ~109 Ohm×cm, coercivity Нс ~3 kOe, saturation magnetization Ms ~50 emu/g, and remanent magnetization Mr ~25 emu/g. The magnetoelectric (ME) ceramics 50 wt.% PZTNB‑1 + 50 wt.% Pb1−xLaxFe12−xZnxO19 (PZTNB‑1 is an industrial piezoelectric material based on lead titanate zirconate (PZT) do not contain impurity phases and have the following characteristics: Piezoelectric coefficients d33 = 10–60 and –d31 = 2–30 pC/N, piezoelectric voltage coefficients g33 = 2–13 and ‑g31 = 1–5 mV×m/N, an electromechanical coupling coefficient Kp = 0.03–0.13, magnetic parameters Нс = 3–1 kOe, Ms = 50–30, and Mr = 25–12 emu/g. The maximum ME coupling coefficient ΔE/ΔH ~1.75 mV/(cm×Oe) was achieved with х = 0.5.

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Fabrication of PbFe12O19 nanoparticles and study of their structural, magnetic and dielectric properties

Cited by 36 publications

References 29 publications

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

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

Lead Hexaferrite - A Brief Review

Gel Synthesis of Hexaferrites Pb1−xLaxFe12−xZnxO19 and Properties of Multiferroic Composite Ceramics PZT–Pb1−xLaxFe12−xZnxO19

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