Combustion synthesis and characterization of Sn4+ substituted nanocrystalline NiFe2O4

Balaji, S.; Selvan, R. Kalai; Berchmans, L. John; Angappan, S.; Subramanian, K.; Augustin, C.O.

doi:10.1016/j.mseb.2005.01.021

Cited by 151 publications

(56 citation statements)

References 28 publications

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“…Recent optical spectroscopy measurements show an indirect bandgap of about 1.6 eV in the minority channel and a direct bandgap of about 2.4 -2.8 eV for NiFe 2 O 4 films of thickness between 150 and 270 nm 16 . Other experimental data for the optical band gap range from 0.33 eV to 3.7 eV for thin films as well as for the bulk [17][18][19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

Thermally driven spin and charge currents in thin NiFe2O4/Pt films

et al. 2013

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We present results on the longitudinal spin Seebeck effect (LSSE) shown by semiconducting ferrimagnetic NiFe2O4/Pt films from room temperature down to 50 K base temperature. To the best of our knowledge, this is the first observation of spin caloric effect in NiFe2O4 thin films. The temperature dependence of the conductivity has been studied in parallel to obtain information about the origin of the electric potentials detected at the Pt coverage of the ferrimagnet in order to distinguish the LSSE from the anomalous Nernst effect. Furthermore, the dependence of the LSSE on temperature gradients as well as the influence of an external magnetic field direction is investigated.PACS numbers: 72.20.Pa

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Section: Introductionmentioning

confidence: 99%

Thermally driven spin and charge currents in thin NiFe2O4/Pt films

et al. 2013

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“…According to the band theory, the change in the concentration of charge carrier with temperature is the main reason of conduction. But in ferrites, the conduction increases with temperature due to [15,16]. AC conductivity and DC resistivity was measured using the two-probe method against different temperatures.…”

Section: Electrical Propertiesmentioning

confidence: 99%

Electrical Properties of Ni-Zn Ferrite Nanoparticles Prepared by Simplified Sol-Gel Method

Munir

Ahmed

Saqib

et al. 2014

J Supercond Nov Magn

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Ferrites have become the source of attention for scientists due to their variety of physical properties. Their massive use in the electronics industry has made the study of their dielectric, thermal, and optical properties unavoidable. These materials have potential applications in high-frequency devices. The empirical formula for the synthesized nanoparticles is given by Ni 0.5 Zn 0.5 Fe 2 O 4 . Nanoferrites were prepared by a simplified sol-gel method. The crystalline phase; crystallite size; surface morphology; dielectric properties such as AC conductivity (σ AC ), dielectric constant ( ), and dielectric loss (tanδ) as a function of frequency at different temperatures; and DC electrical resistivity as a function of temperature were studied. The Ni-Zn nanoferrite was sintered at 550 • C. The X-ray diffraction (XRD) results showed a spinel cubic structure having a lattice constant a = 8.383Å and crystallite size of 12 nm for the (311) peak after sintering. Scanning electron microscopy showed the particle morphology of the samples. AC conductivity (σ AC ) increases with frequency as well as the temperature. DC resistivity decreased with increase in temperature. The observed behavior could be explained by the Maxwell-Wagner model. Parameters observed were correlated to understand the conduction mechanism.

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“…Different methods for synthesis of ferrite powder are co-precipitation 23 , sol-gel method 22 , micro emulsion method 26 , hydrothermal 24,25 , reverse micelle 28 , precursor 27 , etc. Complex synthesis process and lower production rate are the main problems of these wet-chemical methods 29 .Sol-gel auto-combustion or auto-ignition preparation method where the chemical sol-gel and ignition process is combined. This powder preparation method shown great possibility in the synthesization of spinel type ferrite nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

Influence of pH Variation on Structural and Magnetic Properties of Ni-Zn Ferrite Nanoparticles Synthesized by Auto Combustion Method

Tyagi¹,

Ahlawat²

2017

Orient. J. Chem

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Nickel zinc ferrite (Ni 0.5 Zn 0.5 Fe 2 O 4 ) nanoparticles were synthesized via solution auto ignition combustion method. The ferrite samples were synthesized with different pH values 3, 5, 7 and 8. The as synthesized samples were calcined at 800 o C for 4 hours. These synthesized nanopowder have been characterized by XRD, SEM and VSM and effect of pH value on the properties of the ferrite samples were studied. XRD pattern confirmed that samples were crystalline in nature. Crystallite size of ferrite powder increased with increase in basic nature of ferrite nanopaticles. Crystallite size of sample was found 24.86nm, 28.10nm, 33.51nm and 39.61nm at pH values 3, 5, 7 and 8 respectively. The magnetization of samples prepared at different pH values 3, 5, 7 and 8 were found 55.490e.m.u./g, 61.420e.m.u./g, 65.541e.m.u./g and 66.512e.m.u./g respectively.

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Combustion synthesis and characterization of Sn4+ substituted nanocrystalline NiFe2O4

Cited by 151 publications

References 28 publications

Thermally driven spin and charge currents in thin NiFe2O4/Pt films

Thermally driven spin and charge currents in thin NiFe2O4/Pt films

Electrical Properties of Ni-Zn Ferrite Nanoparticles Prepared by Simplified Sol-Gel Method

Influence of pH Variation on Structural and Magnetic Properties of Ni-Zn Ferrite Nanoparticles Synthesized by Auto Combustion Method

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