Structural and magnetic study of the Ti4+-doped barium hexaferrite ceramic samples: Theoretical and experimental results

Mariño-Castellanos, P.; Moreno-Borges, A.C.; Orozco-Melgar, G.; Garcı́a, J.A.; Govea-Alcaide, E.

doi:10.1016/j.physb.2011.03.084

Cited by 48 publications

(26 citation statements)

References 40 publications

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Section: Introductionmentioning

confidence: 99%

“…The hexagonal ferrites with the general formula AM 12 O 19 (where A=Ba, Sr, Pb; M=Fe, Al, etc) were discovered in the first half of the 20th century [1]. Subsequently, the temperature evolution of electromagnetic, thermodynamics, mechanical, calorimetric, etc properties of the pure barium hexaferrite BaFe 12 O 19 have been extensively investigated as described elsewhere [2]. The interest on these compounds was recently revived due to the possibility to manipulate their functional properties by inducing crystal field distortions with dopants [3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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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%

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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“…The barium and strontium hexaferrites and the solid solutions on their base which doped by Al 3 þ , Sc 3 þ , In 3 þ and Ga 3 þ ions [1,2] attract much attention of researches [3][4][5] due to their unique physical properties. They provide a wide range of potential applications, such as multiple-state memory elements, novel memory media, transducers and new functional sensors are needed.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure and magnetic properties of the BaFe12−Al O19 (x=0.1–1.2) solid solutions

Труханов¹,

Турченко

Бобриков

et al. 2015

Journal of Magnetism and Magnetic Materials

336

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“…The barium and strontium hexaferrites and the solid solutions on their base which doped by Al 3 þ , Sc 3 þ , In 3 þ and Ga 3 þ ions [1][2][3] attract much attention of researches [4][5][6][7] due to their unique physical properties. They provide a wide range of potential applications, such as multiple-state memory elements, novel memory media, transducers and new functional sensors are needed.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure and magnetic properties of the BaFe12−In O19 (x=0.1–1.2) solid solutions

Труханов

Турченко

et al. 2016

Journal of Magnetism and Magnetic Materials

139

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a b s t r a c tThe investigations of the crystal and magnetic structure by powder neutron diffractometry as well as the magnetic properties by vibration sample magnetometry for the BaFe 12 À x In x O 19 (x ¼0.1-1.2) solid solutions have been performed at different temperatures and magnetic fields. The atomic coordinates and lattice parameters have been Rietveld refined. The Invar effect has been observed in low temperature range (from 150 K to 10 K). It was explained by the thermal oscillation anharmonicity of atoms. The increase of microstress value with decreasing temperature has been defined from Rietveld refinement. The Curie temperature and change of total magnetic moment per formula unit have been defined for all the compositions of the barium hexaferrites BaFe 12 À x In x O 19 (x ¼ 0.1-1.2) solid solutions. The magnetic structure model is proposed. The most likely reasons and the mechanism of magnetic structure formation are discussed.

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Structural and magnetic study of the Ti4+-doped barium hexaferrite ceramic samples: Theoretical and experimental results

Cited by 48 publications

References 40 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

Crystal structure and magnetic properties of the BaFe12−Al O19 (x=0.1–1.2) solid solutions

Crystal structure and magnetic properties of the BaFe12−In O19 (x=0.1–1.2) solid solutions

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