Study of the thermal decomposition of iron and barium citrates

Srivastava, Amit Kumar; Singh, Puyam S.; Gunjikar, V.G.; Sinha, Amitabha

doi:10.1016/0040-6031(85)87035-0

Cited by 33 publications

(8 citation statements)

References 5 publications

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“…Solid-state reactivity of ferric citrate was studied in air atmosphere which indicates two major exothermic peaks at 154 C and 290 C in a simultaneous thermal analysis tech-0018-9464/98$10.00 © 1998 IEEE nique indicating thermal decomposition reactions as: 1) decomposition of the ferric citrate to acetone-dicarboxylate complex (140-175 C and 2) decomposition of acetone dicarboxylate complex to -Fe O (200-400 C [9]. The high decomposition rate, low decomposition temperature, and the evolution of a large amount of gaseous products H O CO, and CO during the reactions result in the formation of ultrafine -Fe O particles.…”

Section: A Solid-state Reactivity and Xrd Studymentioning

confidence: 99%

“…Iron-nitride systems have been reported in the literature on bulk materials, but the study of single domain nanometer size particles needs further investigation [4]- [8]. Solid state reactivity of a citrate precursor leads to ultrafine ferrites and garnets [9]- [11]. These studies have been extended for the formation of ultrafine single domain -Fe N and -Fe N which have been the subject of intensive experimental and theoretical interest [12]- [14].…”

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confidence: 96%

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Magnetic properties of nanocrystalline γ'-Fe/sub 4/N and έ-Fe/sub 3/N synthesized by citrate route

Panda

Gajbhiye

1998

IEEE Trans. Magn.

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Nanocrystalline 0 -Fe4N and "-Fe3N nitrides are synthesized by using a citrate precursor route. The nitridation of -Fe2O3 results in a nitrogen deficient perovskite 0 -Fe4N phase at 773 K and hexagonal "-Fe3N phase at 823 K. The nitride particle is a magnetic cluster consisting of an assembly of crystallites. 0 -Fe 4 N is a weak itinerant ferromagnet and the particles exhibit acicular platelet-like morphology. The magnetic moments in ultrafine 0 -Fe 4 N and "-Fe 3 N nitride particles are due to spin pairing effects, lattice expansion due to interstitial nitrogens, superparamagnetic behavior, and randomly canted spin structures at the surface. The reduction of magnetization and Curie temperature (T c ) is attributed to fine particle size effects. In -Fe 4 N and "-Fe 3 N, the intermixing of N-2p states with Fe-3d states occurs because of similarities in their density of states, and thus the reduction of unpaired d-electrons results in the lowering of magnetic moments compared to -Fe. The Mossbauer study of 0 -Fe 4 N and "-Fe 3 N nitrides indicate randomly canted spin structures at the surface and corroborates the observed magnetic properties.

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Section: A Solid-state Reactivity and Xrd Studymentioning

confidence: 99%

mentioning

confidence: 96%

Magnetic properties of nanocrystalline γ'-Fe/sub 4/N and έ-Fe/sub 3/N synthesized by citrate route

Panda

Gajbhiye

1998

IEEE Trans. Magn.

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“…Thermal decomposition of metal citrate complexes showed the formation of oxide nanoparticles [6,7]. The reaction of these oxide nanoparticles with NH 3 gas lead to the formation of metal nitrides [8,9].…”

Section: Resultsmentioning

confidence: 98%

Mössbauer and magnetic studies of nanocrystalline γ ′-Fe4N

Kurian

Gajbhiye

2008

Hyperfine Interact

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Iron nitrides are attractive as they show excellent magnetic properties which can be utilized as recording and permanent magnetic materials for potential applications. Due to the high saturation magnetization and chemical stability, γ -Fe 4 N compound is widely investigated as a promising high density magnetic recording material. γ -Fe 4 N particles were synthesized by conventional gaseous nitriding in a heated atmosphere containing ammonia as a source of nitrogen. X-ray diffraction, 57 Fe Mössbauer spectroscopy, vibrating sample magnetometer, scanning electron microscopy and transmission electron microscopy are used for the characterization of the as prepared sample.

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“…The latter requires milling of reactant oxides at elevated temperature, which introduces lattice defects and strains in the ferrites obtained. High sintering temperature (>1,000 • C) results in particle coarsening and aggregation [14][15][16][17]. On the other hand, in the combustion method there is a direct mixing of cations on atomic scale.…”

Section: Resultsmentioning

confidence: 99%

Mössbauer studies of nanosized ferrites prepared by the combustion of metal nitrates–oxalyl dihydrazide solutions

Gandotra

Randhawa

2008

Hyperfine Interact

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Alkaline earth metal ferrites have been prepared by combustion of redox mixtures containing metal nitrates and oxalyl dihydrazide (ODH) at 673 K. On rapid heating, ODH-metal nitrate mixture undergoes an abrupt exothermic redox chemical reaction that facilitates atomic scale mixing of cations. This leads to the formation of stoichiometrically pure and single-phase nanoparticle ferrites at comparatively reduced temperature (400 • C) and in less time than possible by the conventional ceramic method. Because of their different cationic size, polarizability etc., alkaline earth metal cations yield different type of ferrites i.e. MFe 2 O 4 (M = Mg, Ba), Ca 2 Fe 2 O 5 and SrFe 12 O 19 .

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Study of the thermal decomposition of iron and barium citrates

Cited by 33 publications

References 5 publications

Magnetic properties of nanocrystalline γ'-Fe/sub 4/N and έ-Fe/sub 3/N synthesized by citrate route

Magnetic properties of nanocrystalline γ'-Fe/sub 4/N and έ-Fe/sub 3/N synthesized by citrate route

Mössbauer and magnetic studies of nanocrystalline γ ′-Fe4N

Mössbauer studies of nanosized ferrites prepared by the combustion of metal nitrates–oxalyl dihydrazide solutions

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