Anisotropy of the electrical properties of a single crystal of BaFe11.25Ti0.75O19 M-type barium hexaferrite

Живулин, В.Е.; Зайцева, О.В.; Trofimov, Evgeny; Zabeivorota, N.S.; Gavrilyak, M.V.; Подгорнов, Ф. В.; Винник, Д.А.; Almessiere, M.A.; Baykal, A.; Астапович, К.А.; Труханов, А.В.

doi:10.1016/j.jssc.2021.122104

Cited by 8 publications

(3 citation statements)

References 38 publications

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“…The strontium hexaferrite has exclusive properties such as high values of magnetic anisotropy, curie temperature and electrical resistance. Furthermore, they own exceptional corrosion resistance and chemical stability [6,7]. The SFO's possess lower electrical conductivity than Ferro-metallic magnets, which confirms the eddy current reduction and lower energy loss at higher frequencies.…”

Section: Introductionmentioning

confidence: 87%

Effect of Ni2+and Co2+ substitution on the characteristics of the strontium aluminum hexaferrite (SrAl2Fe10O19)

Joshi,

Ruban Kumar

2023

J Sol-Gel Sci Technol

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The nickel and cobalt substituted strontium aluminium hexaferrite Sr1-xNixAl2Fe10O19/Sr1-xCoxAl2Fe10O19 (x = 0.1, 0.2) were synthesized via the sol-gel auto-combustion technique using glycine fuel. The particles formed in hexagonal crystal structure with space group P63/mmc.The field-emission scanning microscopy was adopted for morphological analysis, and the images revealed the plate-like formation of the particles. X-ray photoelectron spectroscopy confirmed the presence and oxidation states of all the elements. The vibrating sample magnetometer studies were taken to determine saturation magnetization (Ms), coercivity (Hc), squareness ratio (Mr/Ms), and energy product (BHmax) values. The electric studies disclosed the presence of relaxations in the system, which was interpreted through Koop and Maxwell-Wagner's model.

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Section: Introductionmentioning

confidence: 87%

Effect of Ni2+and Co2+ substitution on the characteristics of the strontium aluminum hexaferrite (SrAl2Fe10O19)

Joshi,

Ruban Kumar

2023

J Sol-Gel Sci Technol

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“…Nowadays, many researchers focus on promoting the transport properties of hexaferrites without compromising magnetic properties by substituting divalent, trivalent, and even tetravalent cations in place of Fe 3+ /M 2+ [12][13][14][15]. Many studies have reported that the substitution of strontium (Sr 2+ ) for barium (Ba 2+ ) will affect structural, magnetic, and electrical transport properties.…”

Section: Introductionmentioning

confidence: 99%

Low-frequency electrical response related to oxygen vacancies in Al³⁺ substituted M-type hexaferrite

Singh

Mohapatra

Dobbidi

et al. 2023

J. Phys. D: Appl. Phys.

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The presence of oxygen vacancies is unavoidable in many metal complex oxide materials such as hexaferrite. So, this article investigates the role of crystal defects such as oxygen vacancies, and different oxidation states of Fe ions on electrical conduction behaviours of Al3+ substituted Ba0.4La0.1Sr0.5AlxFe12-xO19 hexaferrite by analyzing temperature dependents AC impedance, and AC conductivity. The optimal substitution of La3+ ions and high-temperature sintering is responsible for forming oxygen vacancies while reducing Fe into Fe3+ to Fe2+ cations, observed in structural and XPS analysis, which affects electrical conduction behaviours. The departure from ideal Debye-type relaxation behavior is also one of the effects of crystal defects. Temperature variation relaxation time observed a sharps change at around 403K. This may be due to different electrical entities influence the mode of electron hopping with the temperature. The activation energy calculated from the temperature dependents relaxation time confirmed the presence of the electron hopping through bridging effects of the first ionization of oxygen vacancies Fe2+-V^.o- Fe3+ below temperature 403K. Whereas, above 403K, electron hopping through different oxidation states of Fe2+ + e → Fe3+ and migration of oxygen vacancies toward the bulk surface are responsible for the conduction mechanism. The DC resistivity and AC conductivity briefs that the bridging effects of oxygen defects can also induce Coulombic interaction between the defects sites resulting in Efros-Shklovskii-Variable-Ranges hopping (ES-VRH) and Correlation-Barrier hopping (CBH) below temperature 403K. Above 403K, polaron-assisted electron hopping is more desirable, as confirmed by Non-Overlapping Small Polaron Tunnelling (NSPT)model.

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“…Furthermore, M-type hexaferrite possesses excellent chemical and mechanical stability, enduring thermal resilience, non-toxicity, and corrosion resistance, and is cost-effective to produce. These qualities have made it highly appealing for various applications [24].…”

Section: Introductionmentioning

confidence: 99%

Exploring the role of oxygen vacancies on the magnetic and electromagnetic absorption properties of La³⁺-modified M-type hexaferrite with Al³⁺ doping

Singh,

Mohapatra,

Pal

et al. 2023

J. Phys.: Condens. Matter

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The demand for effective microwave-absorbing materials has recently surged due to rapid advancements in electromagnetic (EM) devices. Recently, engineering oxygen vacancies has also become one of the effective ways to develop efficient microwave-absorbing materials. So, understanding the EM absorption mechanism of these materials has become crucial for better engineering of such materials. This article investigates the magnetic properties along with the EM absorption mechanism of M-type hexaferrite, with optimal incorporation of rare-earth element La3+ and doping of transition metal Al3+ cation. The presence of La3+ ions at an optimal level promotes the reduction of Fe3+ to Fe2+ cations and creating oxygen vacancies to offset the electrical charge imbalance. This phenomenon impacts both the magnetic and EM characteristics of the materials. The presence of Fe2+ cations enhanced the spin-orbital interaction, resulting in a strong magnetic anisotropy field along the c-axis. The lowest reflection loss of −36.37 dB at 14.19 GHz, is observed with a bandwidth of 3.61 GHz below −10 dB for x = 0.6. These microwave absorption properties can be attributed to the adequate compensation between dielectric and magnetic losses, which arise from phenomena like dielectric relaxation, magnetic resonance, and conduction loss due to electron hopping between Fe3+ and Fe2+ with proper incorporation of the attenuating constant and excellent impedance matching, along with microstructure of the materials. Furthermore, the material’s exceptional absorption properties are also influenced by the rapid movement of oxygen vacancies from its interior to its surface when exposed to high frequencies, thereby impacting its conductivity. Therefore, it is believed that the regulation of oxygen vacancies can serve as a versatile strategy for developing materials with efficient microwave-absorbing capabilities.

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Anisotropy of the electrical properties of a single crystal of BaFe11.25Ti0.75O19 M-type barium hexaferrite

Cited by 8 publications

References 38 publications

Effect of Ni2+and Co2+ substitution on the characteristics of the strontium aluminum hexaferrite (SrAl2Fe10O19)

Effect of Ni2+and Co2+ substitution on the characteristics of the strontium aluminum hexaferrite (SrAl2Fe10O19)

Low-frequency electrical response related to oxygen vacancies in Al³⁺ substituted M-type hexaferrite

Exploring the role of oxygen vacancies on the magnetic and electromagnetic absorption properties of La³⁺-modified M-type hexaferrite with Al³⁺ doping

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Anisotropy of the electrical properties of a single crystal of BaFe11.25Ti0.75O19 M-type barium hexaferrite

Cited by 8 publications

References 38 publications

Effect of Ni2+and Co2+ substitution on the characteristics of the strontium aluminum hexaferrite (SrAl2Fe10O19)

Effect of Ni2+and Co2+ substitution on the characteristics of the strontium aluminum hexaferrite (SrAl2Fe10O19)

Low-frequency electrical response related to oxygen vacancies in Al3+ substituted M-type hexaferrite

Exploring the role of oxygen vacancies on the magnetic and electromagnetic absorption properties of La3+-modified M-type hexaferrite with Al3+ doping

Contact Info

Product

Resources

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Low-frequency electrical response related to oxygen vacancies in Al³⁺ substituted M-type hexaferrite

Exploring the role of oxygen vacancies on the magnetic and electromagnetic absorption properties of La³⁺-modified M-type hexaferrite with Al³⁺ doping