Journal ArticleDOI
Characteristic length scales of nanosize zinc ferrite
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TLDR
In this article, it was shown that there are at least two characteristic particle size length scales for nanosize ZnFe2O4 particles prepared by the nitrate route, which are related to inversion of the cation distribution, agglomeration of particles and annihilation at the surface and in the interior.Abstract:
Nanosize zinc ferrite samples with an average particle size of 6–65 nm were prepared by a new chemical reaction involving nitrates of Zn and Fe and investigated for magnetic behaviour and defect structure. The sample with an average particle size of 6 nm has considerable inversion in cation distribution as shown by its hysteresis loop and increased magnetization. Mossbauer spectroscopy gives a single doublet for all the samples. Mossbauer parameters like quadrupole splitting and linewidth change sharply as the average particle size increases from 6 to 7 nm and then afterwards the changes are slow. The total Mossbauer absorption, on the average, increases with increase in particle size, the change from 6 to 65 nm being by a factor of 3. Positron parameters too change sharply as the particle size varies. The changes are related to inversion of the cation distribution, agglomeration of particles and annihilation at the surface and in the interior. The picture that emerges from the lifetime studies and supported by Mossbauer spectroscopy and magnetization studies suggests that there are at least two characteristic particle size length scales for nanosize ZnFe2O4 particles prepared by the nitrate route.read more
Citations
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Journal ArticleDOI
Magnetization of sol–gel prepared zinc ferrite nanoparticles: Effects of inversion and particle size
TL;DR: In this article, the average size of the particles as determined by X-ray diffraction increases with the annealing temperature from 18 to 52 nm, with the increase in particle size, magnetization decreases while the magnetization blocking temperature increases.
Journal ArticleDOI
Simple synthesis and characterization of cobalt ferrite nanoparticles by a thermal treatment method
Mahmoud Goodarz Naseri,Elias Saion,Hossein Abbastabar Ahangar,Abdul Halim Shaari,Mansor Hashim +4 more
TL;DR: In this article, the structural characteristics of the calcined samples were determined by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and transmission electron microscopy (TEM).
Journal ArticleDOI
Synthesis and characterization of zinc ferrite nanoparticles by a thermal treatment method
Mahmoud Goodarz Naseri,Elias Saion,Mansor Hashim,Abdul Halim Shaari,Hossein Abasstabar Ahangar +4 more
TL;DR: In this paper, a vibrating sample magnetometer (VSM) was used to measure super paramagnetic properties for the calcined zinc ferrite (ZnFe2O4) samples.
Journal ArticleDOI
Simple preparation and characterization of nickel ferrite nanocrystals by a thermal treatment method
Mahmoud Goodarz Naseri,Elias Saion,Hossein Abbastabar Ahangar,Mansor Hashim,Abdul Halim Shaari +4 more
TL;DR: In this paper, a solution containing metal nitrates and poly(vinyl pyrrolidone) (PVP) as a capping agent was used to stabilize the particles, and they were thermally treated at various temperatures from 623 to 823 K at which calcination occurred.
Journal ArticleDOI
Structural, magnetic and electrical properties of nanocrystalline zinc ferrite
TL;DR: In this paper, a nano ZnFe 2 O 4 with grain size of 30nm has been synthesized via sol-gel auto combustion method and characterized using DSC (differential scanning calorimetry), XRD (X-ray diffraction), SEM (scanning electron microscopy), EDAX (energy dispersive X-ray analysis), FTIR (Fourier transform infrared spectroscopy), VSM (vibrating sample magnetometer) and Ac-electrical conductivity measurement setup.
References
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Journal ArticleDOI
Program system for analysing positron lifetime spectra and angular correlation curves
Journal ArticleDOI
Magnetic properties of nanostructured ferrimagnetic zinc ferrite
C. N. Chinnasamy,A. Narayanasamy,N. Ponpandian,Kamanio Chattopadhyay,H Guérault,Jean-Marc Greneche +5 more
TL;DR: In this paper, the average grain size and the root mean square strain were estimated from the x-ray diffraction line broadening, and the lattice parameter initially decreases slightly with milling and it increases with further milling.
Journal ArticleDOI
Magnetic properties of partially-inverted zinc ferrite aerogel powders
TL;DR: The magnetic properties of the ball-milled sample are similar to those of ferrimagnetic MgFe2O4 powders having comparable grain size and inversion parameters as mentioned in this paper.
Journal ArticleDOI
Effect of mechanical milling on the structural, magnetic and dielectric properties of coprecipitated ultrafine zinc ferrite
TL;DR: In this article, the effect of milling on zinc ferrite particles have been studied with a view to ascertaining the anomalous behaviour of these materials in the nanoregime.
Journal ArticleDOI
Site preference of Fe in nanoparticles of ZnFe2O4
TL;DR: In this paper, the authors investigated the transition temperature of nanoparticles of ZnFe 2 O 4 and found that the Neel temperature of the nanoparticles is much higher than that of the bulk material.