Structural and properties of hydrothermally synthesised M-type hexaferrites

Zhang, Cong; Liu, Xiansong; Rehman, Khalid Mehmood Ur; Liu, Chaocheng; Li, Haohao; Meng, Xiangyu

doi:10.1007/s10854-016-6096-7

Cited by 7 publications

(3 citation statements)

References 23 publications

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“…For example, by the formation of NiOÀ ZnO p-n heterojunction, the composites showed improved degradation rate toward methyl orange than the single component oxides. [97] Therefore, by synthesis of multi-shelled p-n heterojunctions, the further improved photocatalytic behavior of the catalysts can be realized. Zhan et al [98] prepared multi-shelled CuOÀ ZnO p-n heterojunction utilizing MOF as the hard template and the materials exhibited superior photocatalytic behavior on degradation of methylene blue over others.…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

Synthesis of Single‐Component Metal Oxides with Controllable Multi‐Shelled Structure and their Morphology‐Related Applications

Qin

Lan

Liu

et al. 2019

The Chemical Record

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Multi‐shelled hollow spheres metal oxides, namely materials with more than three shells, have attracted increasing attention due to their unique structure. The preparation methods of typical metal oxides including NiO, Co3O4 and ZnO etc. have been summarized in this review. Simultaneously, the parameters that influence the ultimate morphologies, shell number as well as the compositions have also been discussed. The potential application fields in energy conversion and storage, electromagnetic wave absorption, photocatalysis that related to the unique structure are also highlighted. Finally, the future researches of multi‐shelled hollow spheres metal oxides are further discussed.

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Section: Conclusion and Prospectsmentioning

confidence: 99%

Synthesis of Single‐Component Metal Oxides with Controllable Multi‐Shelled Structure and their Morphology‐Related Applications

Qin

Lan

Liu

et al. 2019

The Chemical Record

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“…[14][15][16][17] Some attempts have been made to promote the formation of hexaferrite with high temperature annealing treatment (above 1000 C), but this method causes other problems, including poor uniformity of crystal dimensions. 17,23,24 Another approach proposed to achieve quasi-pure M-type hexaferrite involves pretreatment with CO 3 2À -free alkaline solution, but the complicated operation makes this method unsuitable for practical application. 25 In this work, a new approach was developed for the direct synthesis of pure M-type strontium hexaferrite through hydrothermal treatment without high-temperature annealing.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis and competitive growth of flake-like M-type strontium hexaferrite

et al. 2019

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In this paper, single flake-like strontium hexaferrite was directly synthesized via a modified hydrothermal approach without high-temperature annealing. To determine the main factors governing the formation of the hexaferrite phase and impurity a-Fe 2 O 3 , effects of alkali environment and concentrations of metal ions on phase composition, grain growth, and magnetic properties were systematically analyzed. Results from XRD, FESEM and FT-IR analyses indicated that initial alkali concentration was the key factor influencing the phase composition of particles. Suitable initial alkali environment can enhance the nucleation and growth of ferrite, and inhibit the formation of by-product a-Fe 2 O 3 at the same time. It was also found that the increase in initial concentration of strontium ions could improve the nucleation of hexaferrite and reduce the grain size, and consequently, change the magnetic performance of hexagonal particles. When the molar ratios of ferric ions to strontium ions were constant, the average grain size did not change significantly with the initial concentration of iron ions, which could be attributed to high levels of strontium ions and hydroxyl ions in the reaction system. The abovementioned results indicate that the optimized hydrothermal conditions are beneficial for the formation of a single phase and for controlling the particle size and magnetic properties of M-type hexaferrite.

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“…The degree of hopping depends on the concentration of Fe 2+ /Fe 3+ ion pairs in the octahedral position. There are numerous attempts to synthesize SrM such as co-precipitation, hydrothermal synthesis, 8 a ceramic method, 9,10 solid-state reaction, 11,12 and sol-gel method, etc. 13 Currently, the preferred technique for producing hexaferrite with favorable characteristics, such as enhanced uniformity, nanoscale particles, costeffectiveness, and control of particle size distribution, is the autocombustion sol-gel method.…”

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confidence: 99%

Experimental and Theoretical Realization of Morphology and Frequency Tuned Charge Transport Dynamics in Co-Zn Doped SrM Hexaferrite: Electrical, Impedance and Relaxation Realm

Thakur,

Singh,

Jotania

et al. 2024

ECS J. Solid State Sci. Technol.

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The present report comprehensively investigates the influence of sol-gel synthesized cobalt and zinc-substituted SrFe12O19 on the morphological, structural, dielectric, and electrical characteristics. XRD analysis revealed that the substituents successfully replaced Fe3+ ions, leading to the existence of a single-phase magneto-plumbite structure of M-type hexaferrite. The crystallite size decreases from 48.94 nm to 45.9 nm as the level of substitution increases in SrM hexaferrite. With increasing the substitution level, SEM micrographs exhibited the formation of grain clusters. The electrical parameters had been investigated in the 20 Hz to 2 MHz frequency range. In the low-frequency region, both dielectric constant and loss tangent decreased with Co-Zn substitution. Sr〖Co〗_0.8 〖Zn〗_0.8 〖Fe〗_10.4 O_19 sample shows the minimum value of AC conductivity 3.95×10-5 Ω-1m-1 in the high-frequency region. Both the electric modulus and impedance spectra exhibit non-Debye behavior in all samples. The Cole-Cole plots (M'' versus M') reveal the existence of a single semicircular arc in the x = 0.0 sample, caused by the grain boundary contribution.

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Structural and properties of hydrothermally synthesised M-type hexaferrites

Cited by 7 publications

References 23 publications

Synthesis of Single‐Component Metal Oxides with Controllable Multi‐Shelled Structure and their Morphology‐Related Applications

Synthesis of Single‐Component Metal Oxides with Controllable Multi‐Shelled Structure and their Morphology‐Related Applications

Hydrothermal synthesis and competitive growth of flake-like M-type strontium hexaferrite

Experimental and Theoretical Realization of Morphology and Frequency Tuned Charge Transport Dynamics in Co-Zn Doped SrM Hexaferrite: Electrical, Impedance and Relaxation Realm

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