Low Temperature Synthesis, Structural, Optical and Magnetic Properties of Bismuth Ferrite Nanoparticles

Srivastav, Simant Kumar; Gajbhiye, N. S.

doi:10.1111/j.1551-2916.2012.05411.x

Cited by 71 publications

(32 citation statements)

References 43 publications

(81 reference statements)

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“…It confirms that as-synthesized BFO nanoparticles exhibit weak ferromagnetic ordering with residual magnetic moment of 0.067 emu/g and coercive field of 185 Oe on applying a magnetic field of 22 kOe. The observed remnant magnetization is higher than many other previous reports [18], which may be due to smaller size and uniform shape of nanoparticles. The particle size of our as-synthesized BFO nanoparticles is about 50 nm, which is less than the wavelength 62 nm of cycloid structure of canted spin.…”

Section: M-h Loop Measurementcontrasting

confidence: 61%

“…Various low temperature wet chemical methods, like hydrothermal, co-precipitation, micro-emulsion technique, modified Pechini's method, mechanochemical, sol-gel and solution combustion route, have been reported for the synthesis of BFO nanoparticles/ceramics [17][18][19][20][21][22] auto-combustion route but it is rare to find collective studies for structural, electrical, magnetic and optical properties of BFO nanoparticles [23][24][25]. It is known that the phase purity is needed for obtaining better magneto-electric properties of BFO.…”

Section: Introductionmentioning

confidence: 99%

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Combined structural, electrical, magnetic and optical characterization of bismuth ferrite nanoparticles synthesized by auto-combustion route

Godara

Sinha

Ray

et al. 2014

Journal of Asian Ceramic Societies

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a b s t r a c tPhase-pure multiferroic bismuth ferrite (BFO) nanoparticles were synthesized by energy efficient, simple and low temperature sol-gel followed by auto-combustion route. Highly crystalline and well-shaped BFO nanoparticles of size about 50 nm were observed in TEM. Thermal analysis was used to optimize the calcination temperature as 500 • C. An endothermic peak at 834 • C has been detected in the DTA curve, representing the Curie temperature. The dielectric anomaly around Neel temperature (T N ) was observed signifying the magnetoelectric coupling. The BFO nanoparticles were found to be highly resistive ( ∼ 3 × 10 9 -cm) and had very low leakage current of the order of A/cm 2 , which resulted from phase purity. A significantly enhanced weak ferromagnetism was observed due to smaller particles size and remnant magnetization and coercive field were 0.067 emu/g and 185 Oe, respectively. P-E loop confirmed the ferroelectric behavior of BFO nanoparticles. The direct band gap energy was calculated to be 2.2 eV from UV-vis studies.

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Section: M-h Loop Measurementcontrasting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Combined structural, electrical, magnetic and optical characterization of bismuth ferrite nanoparticles synthesized by auto-combustion route

Godara

Sinha

Ray

et al. 2014

Journal of Asian Ceramic Societies

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“…The variation in particle size between the micro-and nanoscale sees the band gap change from 1.80 to 2.19 eV, with photo-catalytic decomposition of congo red varying from 15 to 95%. Srivastav et al [9] have shown through propylene glycolbased synthesis that the produced nano-particles exhibited weak ferromagnetic properties at room temperature with a band gap of 2.1 eV.…”

Section: Introductionmentioning

confidence: 99%

Photo-active and optical properties of bismuth ferrite (BiFeO3): An experimental and theoretical study

McDonnell

Wadnerkar

English

et al. 2013

Chemical Physics Letters

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Publication informationChemical Physics Letters, Publisher Elsevier Item record/more information http://hdl.handle.net/10197/4903 Publisher's statementThis is the author's version of a work that was accepted for publication in Chemical Physics Letters. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Chemical Physics Letters (572, , (2013) An experimental and a hybrid density functional theory study of the photo-active and optical properties of bismuth ferrite are presented. Phase-pure photo-catalytically active BFO was prepared experimentally with a 28% degradation of methyl orange observed over a 7-hour period. Direct and indirect band gaps were measured to be 2.10 and 1.92 eV, respectively. BFO was also studied computationally with the use of hybrid density functional theory, quite suitable for such a multiferroelectric material. This led to excellent, semiquantitative agreement between hybrid DFT and experimental approaches for absorption coefficients.

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“…Nanoparticles of La 0.7 Sr 0.3 MnO 3 (LSMO) were prepared by the solgel method. 15 Lanthanum nitrate hexahydrate, La(NO 3 ) 3 .6H 2 O, manganese nitrate tetrahydrate, Mn(NO 3 ) 2 .4H 2 O, strontium nitrate, Sr(NO 3 ) 2 (all from Sigma-Aldrich, USA), propylene glycol (Thomas Baker, India) and citric acid (Merck, Germany) were of analytical grade. Stoichiometric amount of metal nitrates were dissolved in deionized water separately and then mixed to prepare precursor solution.…”

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confidence: 99%

Effect of nanostructure on thermoelectric properties of La_0.7Sr_0.3MnO₃ in 300–600 K temperature range

Singh

Srivastav

Patel

et al. 2018

Mater. Res. Express

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In oxide materials, nanostructuring effect has been found very promising approach for the enhancement of figure-of-merit, ZT. In the present work, we have synthesized La 0.7 Sr 0.3 MnO 3 (LSMO) compound using solgel method and samples of crystallite size of ∼20, ∼41, and ∼49 nm were obtained by giving different heat treatment. Seebeck coefficient (α), electrical resistivity (ρ), and thermal conductivity (κ) measurements were carried out in 300-600 K temperature range. The systematic change in the values of α from ∼ -19 µV/K to ∼ -24 µV/K and drastic reduction in the values of κ from ∼0.88 W/mK to ∼0.23 W/mK are observed as crystallite size is reduced from 49 nm to 20 nm at ∼600 K. Also, fall in the values of ρ in the paramagnetic (PM) insulator phase (400-600 K) are effectively responsible for the increasing trend in the values of ZT at high temperature. For the crystallite size of 41 nm, value of ZT at 600 K was found to be ∼0.017, which can be further increased up to ∼0.045 around 650 K temperature. The predicted value of ZT suggests that LSMO can be suitable oxide material for thermoelectric applications at high temperature.In the past few decades, thermoelectric (TE) materials have been investigated extensively for an alternate and renewable source of energy. 1,2 In the search of new materials, oxide materials have attracted much attention in the field due to their non-toxicity, oxidation resistance, high-temperature stability, easy and low cost manufacturing factors. 3 A material is said to be suitable for the TE application on the basis of figure of merit, ZT, which is defined as ZT = (α 2 σ/κ), where the terms α, σ, and κ are Seebeck coefficient (or thermopower), electrical conductivity (inverse of electrical resistivity, ρ), and thermal conductivity, respectively. 4,5 There are two different source of contributions in the total κ, defined as κ = κ e + κ l , where κ e and κ l are known as electronic and lattice thermal conductivity, respectively. The expression of ZT suggests that, the magnitude of α and σ should be larger; whereas, lower value of κ (especially κ l ) is required for the higher values of ZT. 6 In search of materials with high ZT value, many experimental and theoretical approaches have been used, few of them are such as making the materials with appropriate combination of elements, suitable doping, lowering the dimension, creating defects mechanism, nano structuring and band engineering, etc. 7 Among these, nano structuring method has been one of the novel and effective approach for getting the higher ZT values; as decreasing the grain size to the nano scale region increases the phonon scattering in the intragranular region. Due to this scattering effect, phonon mean free path reduces and results in to the decrement in the value of κ l . 8 In many nanocrystalline size materials, over all values of κ were found to be much lower than that of corresponding bulk or single crystal material. 9Generally, oxide materials have limitations for the TE applications due to its large value of κ. From the ...

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Low Temperature Synthesis, Structural, Optical and Magnetic Properties of Bismuth Ferrite Nanoparticles

Cited by 71 publications

References 43 publications

Combined structural, electrical, magnetic and optical characterization of bismuth ferrite nanoparticles synthesized by auto-combustion route

Combined structural, electrical, magnetic and optical characterization of bismuth ferrite nanoparticles synthesized by auto-combustion route

Photo-active and optical properties of bismuth ferrite (BiFeO3): An experimental and theoretical study

Effect of nanostructure on thermoelectric properties of La_0.7Sr_0.3MnO₃ in 300–600 K temperature range

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Low Temperature Synthesis, Structural, Optical and Magnetic Properties of Bismuth Ferrite Nanoparticles

Cited by 71 publications

References 43 publications

Combined structural, electrical, magnetic and optical characterization of bismuth ferrite nanoparticles synthesized by auto-combustion route

Combined structural, electrical, magnetic and optical characterization of bismuth ferrite nanoparticles synthesized by auto-combustion route

Photo-active and optical properties of bismuth ferrite (BiFeO3): An experimental and theoretical study

Effect of nanostructure on thermoelectric properties of La0.7Sr0.3MnO3 in 300–600 K temperature range

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Effect of nanostructure on thermoelectric properties of La_0.7Sr_0.3MnO₃ in 300–600 K temperature range