Controlled fabrication and characterization of microspherical FeCO3 and α-Fe2O3

Liu, Xiaojie; Wang, Hui; Su, Changhua; Zhang, Pengwei; Bai, Junhong

doi:10.1016/j.jcis.2010.08.017

Cited by 40 publications

(27 citation statements)

References 26 publications

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“…Micro-cubes of MnCO 3 (length ∼ 2-4 µm), nano-cubes of α-Fe 2 O 3 (length ∼ 200 nm) and polycrystalline spheres of FeCO 3 (grain size ∼ 5-10 nm) have been synthesized following the precipitation and hydrothermal routes [30][31][32] Fig.1a-1c. The single crystal of α-Fe 2 O 3 has been grown using Floating Zone technique.…”

Section: Experimental Techniquesmentioning

confidence: 99%

Quasistatic remanence in Dzyaloshinskii-Moriya interaction driven weak ferromagnets and piezomagnets

et al. 2017

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We explore remanent magnetization (µ) as a function of time and temperature, in a variety of rhombohedral antiferromagnets (AFM) which are also weak ferromagnets (WFM) and piezomagnets (PzM). These measurements, across samples with length scales ranging from nano to bulk, firmly establish the presence of a remanence that is quasi static in nature and exhibits a counter-intuitive magnetic field dependence. These observations unravel an ultra-slow magnetization relaxation phenomenon related to this quasi static remanence. This feature is also observed in a defect free single crystal of α-Fe2O3, which is a canonical WFM and PzM. Notably, α-Fe2O3 is not a typical geometrically frustrated AFM and in single crystal form, it is also devoid of any size or interface effects, which are the usual suspects for a slow magnetization relaxation phenomenon. The underlying pinning mechanism appears exclusive to those AFM which are either symmetry allowed WFM, driven by Dzyaloshinskii-Moriya Interaction (DMI) or can generate this trait by tuning of size and interface. The qualitative features of the quasi static remanence indicate that such WFM are potential piezomagnets, in which magnetization can be tuned by stress alone. arXiv:1703.09075v2 [cond-mat.str-el]

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Section: Experimental Techniquesmentioning

confidence: 99%

Quasistatic remanence in Dzyaloshinskii-Moriya interaction driven weak ferromagnets and piezomagnets

et al. 2017

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“…Synthesis of ␣-Fe 2 O 3 microand nanoparticles has been widespread due to their high stability and excellent semiconducting properties [1,2]. Previously synthesized ␣-Fe 2 O 3 micro/nanoparticles include single-crystal dendritic micro-pines [3], nanotubes [4], nanorings [5], rod-like nanocrystals [6], micro-nano-octahedrons [7], star-like nanoparticles [8], microspheres [9,10], nanodiscs [11]) and plate-like particles [12] for magnetic [3,8,12], gas sensor [4,5], battery [4,9,11] and catalytic [7] applications.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of cubic α-Fe2O3 microparticles using glycine: Surface characterization, reaction mechanism and electrochemical activity

Yin

Minakshi

Ralph

et al. 2011

Journal of Alloys and Compounds

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a b s t r a c tCubic ␣-Fe 2 O 3 (hematite) microparticles (side lengths = 0.3-1.3 m) have been synthesized using glycine and ferric chloride via a simple one-step hydrothermal reaction. Their morphological, mineralogical and surface properties have been determined using scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffractometry (XRD) and X-ray photoelectron spectroscopy (XPS). XRD analysis indicated that the synthesized ␣-Fe 2 O 3 microparticles were minerallogically pure. An increase in hydrothermal reaction duration from 10 to 24 h increased the atomic percentages of ␣-Fe 2 O 3 on the surface of the microparticles by almost 8%. The mechanism concerning reactions of species to produce this microparticles precipitate was elucidated based on thermodynamics and ionic equilibrium aspects.In the electrochemical analysis, the synthesized ␣-Fe 2 O 3 microparticles (as cathode material) exhibit an approximate charge capacity of 160 mAh/g and excellent coulombic efficiency of 94%.

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“…These metal oxides electrodes have shown much higher Li-ion storage capacities than that of commercial graphite anodes1. Among these oxides, Fe 2 O 3 is a promising anode material because of low cost, simple manufacturing process, wide range of sources, environmental friendliness and the most important factor, a large theoretical specific capacity (1007 mAh g −1 )56789101112131415. However, their cycling performances are not satisfactory because partial pulverization and electrode cracking may take place upon repetitive cycling reactions between Fe 2 O 3 and Li ions789101112131415.…”

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confidence: 99%

Large and fast reversible Li-ion storages in Fe2O3-graphene sheet-on-sheet sandwich-like nanocomposites

Jin

Wang

2013

Sci Rep

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Fe2O3 nanosheets and nanoparticles are grown on graphene by simply varying reaction solvents in a facile solvothermal/hydrothermal preparation. Fe2O3 nanosheets are uniformly dispersed among graphene nanosheets, forming a unique sheet-on-sheet nanostructure. Due to the structure affinity between two types of two dimensional nanostructures, graphene nanosheets are separated better by Fe2O3 nanosheets compared to nanoparticles and their agglomeration is largely prevented. A large surface area of 173.9 m2 g−1 is observed for Fe2O3-graphene sheet-on-sheet composite, which is more than two times as large as that of Fe2O3-graphene particle-on-sheet composite (81.5 m2 g−1). The sheet-on-sheet composite is found to be better suitable as an anode for Li-ion battery. A high reversible capacity of 662.4 mAh g−1 can be observed after 100 cycles at 1000 mA g−1. The substantially improved cycling performance is ascribed to the unique structure affinity between Fe2O3 nanosheets and graphene nanosheets, thus offering complementary property improvement.

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Controlled fabrication and characterization of microspherical FeCO3 and α-Fe2O3

Cited by 40 publications

References 26 publications

Quasistatic remanence in Dzyaloshinskii-Moriya interaction driven weak ferromagnets and piezomagnets

Quasistatic remanence in Dzyaloshinskii-Moriya interaction driven weak ferromagnets and piezomagnets

Hydrothermal synthesis of cubic α-Fe2O3 microparticles using glycine: Surface characterization, reaction mechanism and electrochemical activity

Large and fast reversible Li-ion storages in Fe2O3-graphene sheet-on-sheet sandwich-like nanocomposites

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