Structural characterization of nano-crystalline BaFe12O19 powders synthesized by sol–gel combustion route

Mali, Amin; Ataie, A.

doi:10.1016/j.scriptamat.2005.06.037

Cited by 222 publications

(82 citation statements)

References 25 publications

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“…The third peak extending up to 600℃ is due to further condensation (the decarboxylation of BaCO 3 formed during the combustion, which has been reported to take place at 1055℃ for pure carbonate and at around 800℃ for a mixture carbonate and an iron oxide [26,43,44]. This peak could also be assigned to simultaneous formation of monoferrite, MFe 2 O 4 (M=Ba, Sr) [26]). The presence of this phase is relatively higher in Z1 compared to Z2, thus, it is quite reasonable to have low saturation magnetization.…”

Section: Tg Analysismentioning

confidence: 79%

“…The second weight loss around 300℃ is due to condensation and the de-composition of the unreacted citric acid that remained after combustion [43]. The third peak extending up to 600℃ is due to further condensation (the decarboxylation of BaCO 3 formed during the combustion, which has been reported to take place at 1055℃ for pure carbonate and at around 800℃ for a mixture carbonate and an iron oxide [26,43,44]. This peak could also be assigned to simultaneous formation of monoferrite, MFe 2 O 4 (M=Ba, Sr) [26]).…”

Section: Tg Analysismentioning

confidence: 92%

“…1(b) for Z1 and Z2, respectively. Both samples exhibit nanoparticles with several different morphologies including polygonic, rod-like, and plate like morphologies [26]. Z1 exhibits particles with size in the range of 40 nm to 500 nm.…”

Section: Sem Analysismentioning

confidence: 99%

“…Figure shows three thermographs indicating the weight losses at 100℃, 300℃ and 650℃. The first peak at 100℃ is due to the loss of residual water in the gel [26]. The second weight loss around 300℃ is due to condensation and the de-composition of the unreacted citric acid that remained after combustion [43].…”

Section: Tg Analysismentioning

confidence: 99%

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The Effect of Condensation on the Morphology and Magnetic Properties of Modified Barium Hexaferrite (BaFe12O19)

et al. 2011

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Abstract:We present a comparison for the effect of condensation on the morphology and magnetic properties of oleic acid modified BaFe12O19 nanoparticles. Two different samples of BaFe12O19 nanoparticles were synthesized by dehydration (Z1) and rotary evaporation (Z2) method, respectively. Oleic acid was used as the surface modification agent to observe the morphological and magnetic changes. The nanoparticles were analyzed by XRD, FTIR, TGA, SEM, and VSM techniques for structural and physicochemical characteristics. Crystallographic analysis reveals the phase as hexaferrite and the average crystallite size of Z1 and Z2 is 21±3 nm and 17±2 nm, respectively. Rotary evaporator accelerates the condensation process in viscous gel (Z2). Due to the use of rotary evaporator, the coating with oleic acid for Z2 product has been accomplished very well, as compared with Z1. As a result, saturation magnetization of Z2 sample is much lower than that of Z1 sample.

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Section: Tg Analysismentioning

confidence: 79%

Section: Tg Analysismentioning

confidence: 92%

Section: Sem Analysismentioning

confidence: 99%

Section: Tg Analysismentioning

confidence: 99%

See 2 more Smart Citations

The Effect of Condensation on the Morphology and Magnetic Properties of Modified Barium Hexaferrite (BaFe12O19)

et al. 2011

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“…Absence of any significant crystalline phase is due to the distribution of metallic ions uniformly throughout the gel in atomic scale. This amorphous phase restricts metal ions from moving throughout the gel and from forming crystalline phases [11], [12]. During the gel drying process, keeping metallic ions apart by a gel network causes the dry gel to become almost amorphous.…”

Section: Experimental Methodsmentioning

confidence: 99%

Synthesis of Nanocrystalline Electron Emissive Materials with Homogenous Composition in Nanoscale

Shiran¹,

Hadianfard²,

Shiezadeh³

2013

IJCEA

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Abstract-In this research, specific stoichiometric mixture of nanocrystalline barium carbonate, calcium carbonate, and aluminum oxide was fabricated by using the sol-gel combustion method. This mixture is used as emissive materials on impregnated cathodes which make up high power vacuum microwave tubes such as klystrons. Composition uniformity and particle size of emissive materials affect the electron emission properties of impregnated cathodes. In this study, dry gel and heat treated powder at 500 °C are investigated by thermal analysis (TG/DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX). The results show that dry gel combusts at 260 °C , and that during combustion transforms from an amorphous phase to a nanocrystalline phase. The average crystallite size of the powders which is calculated by Debye-Scherrer's method based on the XRD patterns is under 45 nm. The results of SEM and EDX of powder after heat treatment at 500 °C show that the particle size of powder is under 100 nm, and the chemical composition of emissive material is uniform at nanoscale.Index Terms-Dispenser cathode, emissive material, nanopowder, sol-gel combustion synthesis.

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Structural and Morphological Characterization of Strontium Ferrite-Ethylcellulose Nanocomposite for Application in Membrane Technology

Stajcic

Radović²

2023

Bioceramics, Biomimetic and Other Compatible Materials Features for Medical Applications

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Structural characterization of nano-crystalline BaFe12O19 powders synthesized by sol–gel combustion route

Cited by 222 publications

References 25 publications

The Effect of Condensation on the Morphology and Magnetic Properties of Modified Barium Hexaferrite (BaFe12O19)

The Effect of Condensation on the Morphology and Magnetic Properties of Modified Barium Hexaferrite (BaFe12O19)

Synthesis of Nanocrystalline Electron Emissive Materials with Homogenous Composition in Nanoscale

Structural and Morphological Characterization of Strontium Ferrite-Ethylcellulose Nanocomposite for Application in Membrane Technology

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