Investigations on the properties of pure and rare earth modified bismuth ferrite ceramics

Kazhugasalamoorthy, S.; Jegatheesan, P.; Mohandoss, R.; Giridharan, N. V.; Karthikeyan, B.; Joseyphus, R. Justin; Dhanuskodi, S.

doi:10.1016/j.jallcom.2009.12.157

Cited by 108 publications

(40 citation statements)

References 23 publications

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“…Formation of wider/bigger grains (from smaller grains) with grain boundary junctions takes place during this high temperature process. [35][36][37] On the other hand, dense morphology, large grains, and surrounded grain boundaries favor the grain boundary stimulated magneto-dielectric response near the Neel temperature, as evidenced and discussed in the section of electrical properties. 37 …”

Section: B Surface Morphologymentioning

confidence: 90%

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Kumari

Ortega

Kumar

et al. 2015

Journal of Applied Physics

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We describe systematic studies on Nd and Mn co-doped BiFeO 3 , i.e., (Bi 0.95 Nd 0.05 ) (Fe 0.97 Mn 0.03 )O 3 (BNFM) polycrystalline electroceramics. Raman spectra and X-ray diffraction patterns revealed the formation of rhombohedral crystal structure at room temperature, and ruled out structural changes in BiFeO 3 (BFO) after low percentage chemical substitution. Strong dielectric dispersion and a sharp anomaly around 620 K observed near the Neel temperature (T N $ 643 K of BFO) support strong magneto-dielectric coupling, verified by the exothermic peak in differential thermal data. Impedance spectroscopy disclosed the appearance of grain boundary contributions in the dielectric data in the region, and their disappearance just near the Neel temperature suggests magnetically active grain boundaries. The resistive grain boundary components of the BNFM are mainly responsible for magneto-dielectric coupling. Capacitive grain boundaries are not observed in the modulus spectra and the dielectric behavior deviates from the ideal Debye-type. The ac conduction studies illustrate short-range order with ionic translations assisted by both large and small polaron hopping. Magnetic studies indicate that the weak antiferromagnetic phase of BNFM ceramics is dominated by a strong paramagnetic response (unsaturated magnetization even at applied magnetic field of 7 T). The bulk BNFM sample shows a good in-plane magnetoelectric coupling (ME) coefficient. V C 2015 AIP Publishing LLC. [http://dx

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Section: B Surface Morphologymentioning

confidence: 90%

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Kumari

Ortega

Kumar

et al. 2015

Journal of Applied Physics

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“…For example, additional nitric acid leaching was usually applied to eliminate the impurity phases in the solid-state route, which resulted in coarser powders with poor reproducibility [8]. The reacting constituents are in some cases mixed beforehand at the atomic scale by various wet methods, such as ferrioxalate precursor method [9], citrate-gel method [10], soft chemical route [11], micro emulsion technique [12], sol-gel process [13], and so on, have also been performed to synthesize pure bismuth ferrite (BiFeO 3 ). Nevertheless, these chemical methods still involve an additional calcined process (C400°C), which resulted in high-energy consumptions and irregular morphology of particle.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature acetone-assisted hydrothermal synthesis and characterization of BiFeO3 powders

Chen

Jin

2014

J Mater Sci: Mater Electron

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Well-crystallized pure perovskite bismuth ferrite (BiFeO 3 ) powders have been synthesized by a facile hydrothermal route at the temperature as low as 130°C with the aid of acetone. In the synthesis, acetone played important roles in the low-temperature synthesis of pure BiFeO 3 . The as-prepared BiFeO 3 powders mainly consisted of cubic particles with the size range from 50 to 200 nm. zero-field-cooled and field-cooled magnetization measurements indicated that pure BiFeO 3 powders showed a spin-glass transition below the freezing temperature. The as-prepared pure BiFeO 3 powders showed weak ferromagnetism and ferroelectricity simultaneously at room temperature. Moreover, the bismuth ferrite BiFeO 3 exhibit efficient photocatalytic activity under visible light irradiation.

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“…Once again, it has also lots of above inherent problems to be used for devices. In order to solve these problems, several attempts have been made to synthesize rare-earth [5][6][7][8][9][10][11][12][13] or other elements [14] modified BFO or/and fabricate its solid solution and/or composites with other ferroelectric/ferrites [15]. In view of the above, structural, dielectric, electrical and magnetic properties of a new multioferroic fabricated with ferroelectric Bi 4 Ti 3 O 12 (T c = 650°C) and BiFeO 3 in equal molecular ratio (i.e., Bi 5 Ti 3 FeO 15 ) have been reported [16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Structural and electrical properties of Bi3La2Ti3FeO15 ceramics

Mohapatra

Das

Choudhary

2016

J Mater Sci: Mater Electron

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This research article reports structural and electrical (dielectric, impedance and conductivity) characteristics of La 3? modified Bi 5 Ti 3 FeO 15 multiferroic (i.e., Bi 3 La 2 Ti 3 FeO 15 ). Preliminary structural analysis of the prepared material using room temperature X-ray diffraction (XRD) data confirmed the formation of a single-phase compound in the orthorhombic crystal. The nature of scanning electron micrograph of the compound showed the uniform distribution of grains on the sample surface with less voids (high density) Detailed studies of dielectric, impedance and conduction characteristics of the material, carried out in a wide frequency range (100 Hz-1000 kHz) at different temperatures (room temperature to 500°C) using a complex impedance spectroscopy technique, have provided vital information on dielectric relaxation, conduction mechanism and role of grains, grain boundary and interface in understanding of structure-property relationship of the material.

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Investigations on the properties of pure and rare earth modified bismuth ferrite ceramics

Cited by 108 publications

References 23 publications

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Low-temperature acetone-assisted hydrothermal synthesis and characterization of BiFeO3 powders

Structural and electrical properties of Bi3La2Ti3FeO15 ceramics

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