Selective synthesis on structures and morphologies of BixFeyOz nanomaterials with disparate magnetism through time control

Chen, Yijun; Wu, Qingsheng; Zhao, Jing

doi:10.1016/j.jallcom.2009.08.022

Cited by 39 publications

(15 citation statements)

References 36 publications

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“…The magnetic properties of Bi 25 FeO 40 samples prepared by soft−chemistry methods have been only rarely investigated and deviating results have been reported. Cheng et al [13] found a paramagnetic−like behaviour at room temperature, whereas a superparamagnetic behaviour was also reported by other research groups [5,14,15,16]. In contrast a clear hysteresis loop at room temperature was also found pointing to a ferro-or ferrimagnetic behaviour [17].…”

Section: Craig Andsupporting

confidence: 54%

“…Additionally the values of the specific magnetization at room temperature vary significantly [5,13,14,15,17]. Moreover, a spin−glass freezing behaviour [17] as well as a possible ferromagnetic transition at low temperatures [5] were also reported.…”

Section: Craig Andmentioning

confidence: 91%

“…In addition to the classical solid state synthesis [7], various hydrothermal syntheses were performed to obtain Bi 25 FeO 40 powders. The reported hydrothermal processes were mostly carried out with non−stoichiometric initial Bi/Fe ratios of 1, despite of the Bi/Fe ratio of 25 according to the chemical formula of iron sillenite [5,13,14,17,15,21,27,28]. A solvothermal synthesis by Dai and Yin [23] with an initial ratio of Bi/Fe = 24 led to Bi 25 FeO 40 with small amounts of Bi 2 O 3 .…”

Section: Craig Andmentioning

confidence: 99%

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Investigations on Bi25FeO40 powders synthesized by hydrothermal and combustion-like processes

Köferstein

Buttlar

Ebbinghaus

2014

Journal of Solid State Chemistry

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The syntheses of phase−pure and stoichiometric iron sillenite (Bi 25 FeO 40) powders by a hydrothermal (at ambient pressure) and a combustion−like process are described. Phase−pure samples were obtained in the hydrothermal reaction at 100 °C (1), whereas the combustion−like process leads to pure Bi 25 FeO 40 after calcination at 750 °C for 2 h (2a). The activation energy of the crystallite growth process of hydrothermally synthesized Bi 25 FeO 40 was calculated as 48(9) kJ mol −1. The peritectic point was determined as 797(1) °C. The optical band gaps of the samples are between 2.70(7) eV and 2.81(6) eV. Temperature and field−depending magnetization measurements (5−300 K) show a paramagnetic behaviour 2 with a Curie constant of 55.66•10 −6 m 3 •K•mol −1 for sample 1 and C = 57.82•10 −6 m 3 •K•mol −1 for sample 2a resulting in magnetic moments of µ mag = 5.95(8) µ B •mol −1 and µ mag = 6.07(4) µ B •mol −1. The influence of amorphous iron−oxide as a result of non-stoichiometric Bi/Fe ratios in hydrothermal syntheses on the magnetic behaviour was additionally investigated.

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Section: Craig Andsupporting

confidence: 54%

Section: Craig Andmentioning

confidence: 91%

Section: Craig Andmentioning

confidence: 99%

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Investigations on Bi25FeO40 powders synthesized by hydrothermal and combustion-like processes

Köferstein

Buttlar

Ebbinghaus

2014

Journal of Solid State Chemistry

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“…Besides, a small secondary phase corresponding to Bi 25 FeO 40 is present in the entire diffraction pattern (marked by asterisk *) which is not ferromagnetic in nature at room temperature. 25 Our observations are consistent with recent reported rare earth doped BFO systems. 23 26 27 Rietveld refinement method has been used for further structural analysis on the measured XRD patterns of these samples.…”

Section: Structural Analysis and Morphologysupporting

confidence: 93%

Crystal Structure and Enhanced Dielectric, Magnetic Properties of Gd Doped BiFeO<SUB>3</SUB> Ceramics

Suresh¹,

Srinath²

2013

mater focus

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Room temperature multiferroic Gd x Bi 1−x FeO 3 (GBFO) samples were prepared by solid state reaction method for x = 0.0 − 0.35 with an increment of 0.05. We report a thorough analysis of the structural, magnetic and dielectric properties of GBFO bulk polycrystalline samples. These structures were analyzed from X-ray diffraction (XRD) studies. A mixed rhombohedral and orthorhombic structure is observed for 0.1 ≤ x ≤ 0.15 and it transforms to orthorhombic structure at x ≥ 0.2. The Raman spectra of all the compounds reveal the appearance of a new mode (A g ) at 300 cm −1 and a shift in the peaks confirms the structural transition in BiFeO 3 under Gd doping. Further, the dielectric constant ( r is measured as a function of frequency from 20 Hz to 2 MHz at room temperature. As Gd 3+ ions substitutes Bi 3+ , the dielectric constant increases to a maximum value of 900 at 1 kHz for x = 0.1. The enhancement in dielectric constant is due to the ferroelectric off-centring distortion brought by the structural changes. As Gd content increases, the canted anti-ferromagnetic behaviour gradually vanishes and ferromagnetic ordering develops. A strong irreversibility in 'zero-field-cooled (ZFC)' and 'field-cooled (FC)' magnetization is observed for a temperature range of 300-850 K. The enhancement in the magnetization is due to the destruction of the spiral spin structure.

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“…From Figure 3, it can be seen that the dielectric constant decreases with increase in the frequency. The observed behavior of BSFMO nanoparticles can be attributed to the space charge relaxation effect on the basis of polarization and hopping conduction processes in nanoparticles [29]. As, both dielectric constant 'ε' (real part) and dielectric loss 'ε' account for charge storage capacity/polarization ability and energy dissipation; it is observed that the dielectric constant is decreased rapidly by increasing frequency and become independent at high frequency range.…”

Section: Resultsmentioning

confidence: 92%

Structural, Magnetic and Dielectric Properties of Sm3+ and Mn2+ Co-doped BiFeO3 Nanoparticles

Si¹,

Kiani²,

Rizwan³

2017

J Powder Metall Min

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Selective synthesis on structures and morphologies of BixFeyOz nanomaterials with disparate magnetism through time control

Cited by 39 publications

References 36 publications

Investigations on Bi25FeO40 powders synthesized by hydrothermal and combustion-like processes

Investigations on Bi25FeO40 powders synthesized by hydrothermal and combustion-like processes

Crystal Structure and Enhanced Dielectric, Magnetic Properties of Gd Doped BiFeO<SUB>3</SUB> Ceramics

Structural, Magnetic and Dielectric Properties of Sm3+ and Mn2+ Co-doped BiFeO3 Nanoparticles

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