Influence of fuel ratios on auto combustion synthesis of barium ferrite nano particles

Bahadur, D.; Rajakumar, S.; Kumar, Ankit

doi:10.1007/bf02708761

Cited by 62 publications

(39 citation statements)

References 31 publications

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“…In the SHS methods, the combustion mixture, the nitrates and the activator, behave like conventional 'oxidants' and 'fuels' and undergo self-sustained combustion, producing ashes containing the oxide product (Varma and Lebrat 1992;Patil et al 2002;Bahadur et al 2006). During the combustion, exothermic redox reactions associated with nitrate decomposition and fuel oxidation take place.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of monoclinic rare earth titanates, RE2Ti2O7 (RE = La, Pr, Nd), by a modified SHS method using inorganic activator

Krishnankutty

Dayas

2008

Bull Mater Sci

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The nano particles of phase pure rare earth titanates, synthesized by the SHS technique, get well sintered at lower temperatures compared to the compounds formed by the solid-state method. These dielectrics are highly stable and can be used in the microwave frequency range. We report here a modified SHS method to synthesize phase pure monoclinic RE 2 Ti 2 O 7 at 350°C through the oxide/nitrate precursors using an inorganic compound, ammonium acetate, in place of the general type of organic activators such as urea, alanine etc. The nanopowders of La 2 Ti 2 O 7 , Pr 2 Ti 2 O 7 and Nd 2 Ti 2 O 7 on heating exhibit an exothermic behaviour with a broad maxima in the range 267-284°C and become endothermic with maxima in the range 1043-1220°C; interestingly, the phase pure crystalline material is formed at the temperature of exothermic maxima, as confirmed by XRD.

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Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of monoclinic rare earth titanates, RE2Ti2O7 (RE = La, Pr, Nd), by a modified SHS method using inorganic activator

Krishnankutty

Dayas

2008

Bull Mater Sci

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“…The reaction of formation takes place in the range of 650-950°C. A. Ataie et al, have reported 634 and 733°C as the lowest temperature for the formation of barium hexaferrites and strontium hexaferrites using co-precipitation and modified co-precipitation methods, respectively (Huang et al 2003;Mali and Ataie 2004;Bahadur et al 2006;Yu and Liu 2006;Ataie and Manesh 2001). There is no noticeable weight loss observed up to 1,000°C.…”

Section: Experimental Methodsmentioning

confidence: 99%

Structural and magnetic properties of nanocrystalline BaFe12O19 synthesized by microwave-hydrothermal method

et al. 2012

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Nanocrystalline BaFe 12 O 19 powders were prepared by microwave-hydrothermal method at 200°C/ 45 min. The as-synthesized powders were characterized by using X-ray diffraction (XRD), thermogravimetry (TG) and differential thermal analysis (DTA). The present powders were densified at different temperatures, i.e., 750, 850, 900 and 950°C for 1 h using microwave sintering method. The phase formation and morphology studies were carried out using XRD and field emission scanning electron microscopy (FE-SEM). The average grain sizes of the sintered samples were found to be in the range of 185-490 nm. The magnetic properties such as saturation magnetization and coercive field of sintered samples were calculated based on magnetization curves. A possible relation between the magnetic hysteresis curves and the microstructure of the sintered samples was investigated.

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“…The magnetization rises linearly as the applied field increases from zero in either direction and saturation in hysteresis loop was not attained which may be anticipated from the presence of non-magnetic Zn 2? ions and low magnetic Cr 3? ions in the compound [25]. According to Neel's two-sublattice model, there are three kinds of super-exchange interactions in spinel ferrite, i. comparatively high magnetic Fe 3?…”

Section: M-h Loop Analysismentioning

confidence: 99%

An investigation of structural and magnetic properties of Cr–Zn ferrite nanoparticles prepared by a sol–gel process

Lakshmi¹,

Kumar

Thyagarajan

2015

J Nanostruct Chem

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Cr x Zn Fe 2-x O 4 (with x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) spinel ferrite nanoparticles have been synthesized via sol-gel method. The precursor compound was calcined at a temperature of 900°C for 3 h. The aim of this study was to investigate the effect of Cr 3? ion substitution on the structural and magnetic properties of Cr-Zn ferrite. The size, shape, and chemical state of the synthesized powders were structurally characterized by powder XRD, SEM, TEM, HRTEM, SAED, energy-dispersive X-ray analysis (EDAX), and Fourier transform infrared spectroscopy (FTIR) spectral techniques. The XRD pattern of Cr-Zn ferrite provides information about single-phase formation of spinel structure with cubic symmetry. Both crystallite size and lattice parameter decrease with increasing Cr content. Formation of spinel structure is affirmed by using FTIR and FTIR spectra which shows that the bands t1 and t2 are found to shift gradually toward the higher frequency side with substitution of Cr, which have been attributed to the decrease in the lattice constant. SEM and TEM micrographs demonstrated that nanoparticles with narrow size distribution were obtained. The average grain size was found to be in nanometer range and of the order of 43-63 nm obtained using TEM images. Compositional stoichiometry was confirmed by EDAX technique. The magnetic properties of synthesized chromium-substituted Zn ferrite nanoparticles were studied using vibrating sample magnetometer at room temperature under the applied magnetic field of 15 KG. The result indicated that the amount of Cr contents significantly influenced the crystal morphology and structural and magnetic properties of Cr-doped Zn ferrite nanoparticles.

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Influence of fuel ratios on auto combustion synthesis of barium ferrite nano particles

Cited by 62 publications

References 31 publications

Synthesis and characterization of monoclinic rare earth titanates, RE2Ti2O7 (RE = La, Pr, Nd), by a modified SHS method using inorganic activator

Synthesis and characterization of monoclinic rare earth titanates, RE2Ti2O7 (RE = La, Pr, Nd), by a modified SHS method using inorganic activator

Structural and magnetic properties of nanocrystalline BaFe12O19 synthesized by microwave-hydrothermal method

An investigation of structural and magnetic properties of Cr–Zn ferrite nanoparticles prepared by a sol–gel process

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