The structural and magnetic characterization of ironstone-derived magnetite ceramic nanopowders

Husain, Halimah; Sulthonul, M.; Hariyanto, B; Taryana, Yana; Klyusubun, W.; Wannapaiboon, Suttipong; Darminto, D.; Pratapa, Suminar

doi:10.1007/s10854-020-03786-w

Cited by 9 publications

(10 citation statements)

References 46 publications

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“…The LCF result of the composition of oxidation state Fe2O3 (3+) is 73.3% and FeO (2+) is 26.7%. The analysis using interpolation exhibits good agreement with LCF result since the oxidation state of multivalence Fe is in between 2+ and 3+ [14][15][16]. The multivalence of Fe, which triggered the existence of a small magnetic polaron, is responsible for the interplay between electronic conductivity and magnetism in LiFePO4 [17].…”

Section: Resultssupporting

confidence: 62%

Local Structure and Magnetism of LiFeSi0.01P0.99O4/C as a Cathode Material on Lithium-Ion Battery

Maghfirohtuzzoimah

Intifadhah

Az-Zahra

et al. 2021

JMA

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The oxidation state and local structure of LiFeSi0.01P0.99O4/C composites as a cathode on lithium-ion battery were investigated by Fe K-edge X-ray Absorption Near Edge Spectroscopy (XANES) and Extended X-ray Absorption Fine Structure (EXAFS). The LiFeSi0.01P0.99O4/C sample was prepared by solid-state reaction process. Based on the XANES analysis, the absorption of edge energy (E0) of the sample was 7124.92 eV. In addition, linear combination fitting (LCF) analysis of XANES confirmed the oxidation state of iron mixture of 2+ and 3+ as the effect of silicon doped in LiFePO4. The Fourier Transform (FT) of the Fe K-edge EXAFS fitting analysis showed that the nearest neighbors surrounding atom Fe were the main peak with high intensity that confirmed Fe-O bond; the second and third peak with lower intensity confirmed Fe-P and Fe-Fe bonds, respectively. In addition, the SQUID magnetometer result of LiFeSi0.01P0.99O4/C indicated the antiferromagnetic order temperature of LiFeSi0.01P0.99O4/C at ~51 K with the indication of the presence of impurity and structural distortion.

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Section: Resultssupporting

confidence: 62%

Local Structure and Magnetism of LiFeSi0.01P0.99O4/C as a Cathode Material on Lithium-Ion Battery

Maghfirohtuzzoimah

Intifadhah

Az-Zahra

et al. 2021

JMA

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“…Show the microwave absorption parameter of natural ironstone, S6, and S7 samples. The second absorption peak around 11 GHz is in good condition for absorption conditions, lower than −10 dB [21]. The absorption of an electromagnetic wave is about 71,78, and 75.31% for S6, and S7, respectively.…”

Section: Microwave Absorption Propertiesmentioning

confidence: 89%

Synthesis, structural, and microwave absorption properties of hematite (α-Fe₂O₃) and maghemite (γ-Fe₂O₃)

Husain,

Nurhayati,

Susanto

et al. 2023

Phys. Scr.

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This work demonstrated the synthesis, structural, and microwave absorption properties of hematite (α-Fe2O3) and maghemite (γ-Fe2O3) nanopowders. The desired samples are successfully synthesized from the natural ironstone of Indonesia by using the co-precipitation method. The variations of acidic environments during the synthesis process (i.e., pH 6 and 7) were done to obtain the maghemite and hematite phases. A combination of x-ray diffraction (XRD) and scanning electron microscopy (SEM) measurements were used to investigate the crystal and microstructure, respectively. Meanwhile, the vector network analyzer (VNA) was performed to examine the microwave absorption properties at x-band frequency. The structural measurements of the samples confirmed the formation of single-phase maghemite and hematite phases for precipitation pH 6 and 7, respectively, which showed the change in morphology after the precipitation process and sphere-like agglomerated particles of samples. The results Debye-Scherrer equation indicates that the crystal size of precipitated samples is on the order of nanometers. The microwave absorption characteristics through VNA measurements showed enhanced microwave absorption properties after the precipitation process, the RLmax of natural ironstone increased from -4.39 dB to -10,99 and -11,72 dB for S6 and S7 samples, respectively. Generally, the hematite and maghemite reveal the same pattern of absorption peaks. The RLmax of natural ironstone, S6, and S7 samples were observed at 10.52, 11.04, and 11,06 GHz, respectively. These results revealed that the variation of acidic environments during the synthesis process influenced the structure and microwave absorption.

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“…Hematite's morphology, crystalline structure, and subsequently its characteristics are known to be significantly impacted by the heat treatment process known as calcination. Hematite's effectiveness in applications including catalysis [13], radar absorption materials [14], membranes [15], and energy storage [16] is greatly influenced by its structural characteristics, such as crystal phase and crystallite size. In order to identify the fundamental mechanisms controlling these alterations, researchers have thoroughly examined how the temperature of calcination affects the structure [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Selecting the appropriate raw materials is essential to produce high-crystallinity single-phase hematite material, in addition to the synthesis parameter processes. In earlier work, we employed ironstone as the starting material to create magnetite in order to preserve environmental sustainability and balance [16,17]. However, apart from the impurity problem, the amount of energy needed to reduce its size so it can be dissolved is also a challenge.…”

Section: Introductionmentioning

confidence: 99%

Effect of calcination temperature on structure evolution of hematite nanoparticles

Husain,

Adi,

Subaer

et al. 2024

Phys. Scr.

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This research aims to examine the transition structure of iron oxide, namely from magnetite to hematite, and the impact of calcination temperature on the structural development of hematite nanoparticles. The coprecipitation process was used to extract the magnetite from Indonesian local iron sand. Magnetite was calcined at several temperatures (350, 500, 650, and 800 °C) to produce hematite. Several characterization methods were combined to investigate the structure changes due to the effect of calcination temperature. The synchrotron X-ray diffraction (SRD) and X-ray absorption spectroscopy (XAS) techniques were used to investigate the crystal and local structure, respectively. The Debye-Schrerer equation at the most dominant SRD peak were used to determine the crystallite size. Meanwhile, scanning electron microscopy (SEM) performed to studied the surface morphology. The results of SRD showed that the Fe3O4 and α-Fe2O3 phases are visible in the sample calcined at 350°C, whereas the single-phase α-Fe2O3 was seen at higher temperatures. It was also observed that the crystallinity and crystallite size increased due to the increasing calcination temperature. The crystallite size increased from 9.57 to 29.55, 16.40, 28,48, 29.26, and 29.55 nm for the magnetite, H350, H500, H650, and H800 samples. Meanwhile, XAS fitting data found that higher calcination temperatures increase the interatomic distance but decrease the Debye-Waller factor. It can be concluded that the transformation from Fe3O4 to single-phase α-Fe2O3 was observed at 500oC. A higher calcination temperature of at least 800oC wouldn't change the phase but affect the structure parameters.

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The structural and magnetic characterization of ironstone-derived magnetite ceramic nanopowders

Cited by 9 publications

References 46 publications

Local Structure and Magnetism of LiFeSi0.01P0.99O4/C as a Cathode Material on Lithium-Ion Battery

Local Structure and Magnetism of LiFeSi0.01P0.99O4/C as a Cathode Material on Lithium-Ion Battery

Synthesis, structural, and microwave absorption properties of hematite (α-Fe₂O₃) and maghemite (γ-Fe₂O₃)

Effect of calcination temperature on structure evolution of hematite nanoparticles

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The structural and magnetic characterization of ironstone-derived magnetite ceramic nanopowders

Cited by 9 publications

References 46 publications

Local Structure and Magnetism of LiFeSi0.01P0.99O4/C as a Cathode Material on Lithium-Ion Battery

Local Structure and Magnetism of LiFeSi0.01P0.99O4/C as a Cathode Material on Lithium-Ion Battery

Synthesis, structural, and microwave absorption properties of hematite (α-Fe2O3) and maghemite (γ-Fe2O3)

Effect of calcination temperature on structure evolution of hematite nanoparticles

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Synthesis, structural, and microwave absorption properties of hematite (α-Fe₂O₃) and maghemite (γ-Fe₂O₃)