Cation Distribution in Lithium Ferrite (LiFe5O8) Prepared via Aerosol Route

Singhal, Sonal; Chandra, K.

doi:10.4236/jemaa.2010.21008

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…Both samples obtained by sol-gel method, treated at 800 and 1200 ºC, have a magnetization of ≈87 emu/g for a magnetic field of 20 kOe. This value is very close to that obtained in the literature for this material prepared by the aerosol method [14,15]. For others authors, the magnetization of lithium ferrite is about 60 emu/g [1], [16], which is close to that obtained in the treated samples between 1050 °C and 1150 °C, by SSR method (Fig.…”

Section: Hysteresis Loopssupporting

confidence: 90%

Lithium Ferrites Prepared Differently and its Magnetic Properties

Teixeira

2020

Magnetic Oxides and Composites II

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The purpose of this chapter is to compare the structural, morphologic and magnetic properties of lithium ferrite nanoparticles obtained by solid state reaction (SSR) and solgel (SG) methods using nitrates as raw materials. Samples structure was studied by X-ray diffraction and Raman spectroscopy and their morphology by scanning electron microscopy. SG method favored the appearance of the single lithium ferrite crystal phase at lower heat treatment temperature. The more suitable samples to be applied in electronic devices are the ones treated at 1200 ºC, which present the highest levels of saturation magnetization (≈68 emu/g at 300 K).

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Section: Hysteresis Loopssupporting

confidence: 90%

Lithium Ferrites Prepared Differently and its Magnetic Properties

Teixeira

2020

Magnetic Oxides and Composites II

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“…[13]. similar value to the one obtained by Singhal [30] on lithium ferrite prepared by aerosol route. This high magnetization is attributed to the formation of Fe 3 O 4 (M s = 92 emu/g [31]) as proved by XRD results.…”

Section: Magnetic Measurementssupporting

confidence: 71%

Lithium Ferrite: Synthesis, Structural Characterization and Electromagnetic Properties

Teixeira¹,

Graça²,

Valente³

et al. 2017

Magnetic Spinels - Synthesis, Properties and Applications

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Lithium ferrite (LiFe 5 O 8 ) is a cubic ferrite, belongs to the group of soft ferrite materials with a square hysteresis loop, with high Curie temperature and magnetization. The spinel structure of LiFe 5 O 8 has two crystalline forms: ordered, β-LiFe 5 O 8 (Fd3m space group) and disordered, α-LiFe 5 O 8 (P4 1 32/P4 3 32 space group). It has numerous technological applications in microwave devices, computer memory chip, magnetic recording, radio frequency coil fabrication, transformer cores, rod antennas, magnetic liquids among others. It is also a promising candidate for cathode in rechargeable lithium batteries. In this work, the dc electrical conductivity, the impedance spectroscopy and the magnetization of Li 2 O-Fe 2 O 3 powders, with [Li]/[Fe]=1/5 (mol), heat-treated at several temperatures, are studied and related to their structure and morphology. The structural data were obtained by X-ray diffraction and Raman spectroscopy, and the morphology by scanning electron microscopy. The impedance spectroscopy was analysed in function of temperature and frequency, and it was observed that the dielectric properties are highly dependent on the microstructure of the samples. The dc magnetic susceptibility was recorded with a vibrating sample magnetometer, under zero field cooled and field cooled sequences, between 5-300 K. Typical hysteresis curves were obtained and the saturation magnetization increases with increase in heat-treatment temperature.

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“…Gần đây, nhiều nhà nghiên cứu đã nỗ lực tìm kiếm phương pháp tổng hợp hạt nano ferit Liti nhằm giảm nhiệt độ thiêu kết và cải thiện tính chất từ bằng cách kiểm soát kích thước và hình dạng hạt. Nhiều phương pháp hóa học thực hiện ở nhiệt độ thấp đã sử dụng như: phản ứng pha rắn ở nhiệt độ thấp [3], nghiền hành tinh năng lượng cao [4], sol-gel đốt tự động [5,6], phân hủy gel citrate [7], aerogel [8] và sol-gel tự cháy [9],… Trong đó phương pháp sol-gel tự cháy được chú ý hơn cả vì phương pháp này có khả năng tạo ra các hạt có kích thước nano đồng đều và nhiệt độ thiêu kết thấp [10]. Tuy nhiên, các yếu tố ảnh hưởng đến tính chất của hạt nano Li ferit như: tỷ lệ giữa axit citric (AC) và gốc muối nitrat, pH của dung dịch ban đầu, nhiệt độ thiêu kết (Ttk) và thời gian (t) xử lý gel, aerogel,… cần được quan tâm nghiên cứu khi sử dụng phương pháp này.…”

Section: Giới Thiệuunclassified

"Effect of Sintering Temperature on Properties of Li0.5Fe2.5O4 Ferrites Nanoparticles"

2022

JST: ETSD

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In this work, Li0.5Fe2.5O4 ferrite nanoparticles were synthesized by the sol-gel method. The influence of the annealing temperature on phase formation, microstructure, and magnetic characterizations of Li-ferrite was explored. The result of XRD showed that the preliminary calcined and sintered samples at 500 oC are single-phase spinel structures. The crystallite size increases from 16.9 nm to 37.8 nm, with sintering temperatures increasing from 500 oC to 800 oC. The magnetic properties of Li ferrite powders were strongly depended on sintering temperature (Ttk). Coercive force (HC) followed a simple model of Gauss's law. The magnetic saturation (MS) was dependent on the sintering temperature of the gel, reaching a maximum value of 74 emul/g, which is higher than the bulk material. Curie temperature (TC) of Li ferrite nanoparticles is a function of gel sintering temperature, and it reaches 98% of the TC value of bulk materials.

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Cation Distribution in Lithium Ferrite (LiFe5O8) Prepared via Aerosol Route

Abstract: ABSTRACT

Cited by 6 publications

References 16 publications

Lithium Ferrites Prepared Differently and its Magnetic Properties

Lithium Ferrites Prepared Differently and its Magnetic Properties

Lithium Ferrite: Synthesis, Structural Characterization and Electromagnetic Properties

"Effect of Sintering Temperature on Properties of Li0.5Fe2.5O4 Ferrites Nanoparticles"

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