Variation of structural and hyperfine parameters in nanoparticles of Cr-substituted Co-Zn ferrites

Sharma, Ram Kripal; Sebastian, Varkey; Lakshmi, N.; Venugopalan, K.; Reddy, ‬V. Raghavendra; Gupta, Ajay

doi:10.1103/physrevb.75.144419

Cited by 53 publications

(16 citation statements)

References 19 publications

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“…The radius of the tetrahedral and octahedral sites in a spinel ferrite can be calculated using the following formulae: 37,38 Where R O is the radius of the oxygen ion (1.32 o A) and u represents the oxygen positional parameter (table 3).…”

Section: S Xmentioning

confidence: 99%

Al and PEG Effect on Structural and Physicochemical Properties of CoFe2O4

Mostaghni

Abed

2017

Mat. Res.

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In this work, pure and Alumina doped cobalt ferrite nanoparticles CoFe 2−x Al x O 4 (for x = 0.44) have been synthesized by the sol gel method. The influence of alumina doping on the morphological and mechanical properties of CoFe 2 O 4 nano-particles were investigated by means of X-ray powder diffraction (XRD) and rietveld analysis. XRD analysis confirmed that the single phase formation of pure nano particles with the expected cubic inverse spinel structure with Fd3m space group and without any impurity phase. Alumina doping were led to a decrease in the crystallite size, lattice parameter, elastic constants and magnitude of moduli. It is explained on the basis of the replacement of Fe ions with half-filled d-shell (3d 5 ) and larger radius by Al 3+ ions with a completely filled shell (2p 6 ) and smaller radius.

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Section: S Xmentioning

confidence: 99%

Al and PEG Effect on Structural and Physicochemical Properties of CoFe2O4

Mostaghni

Abed

2017

Mat. Res.

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“…Bulk [6] and together with the relative hyperfine values at the different Fe sites, explains the observed magnetic properties fairly well. Dependence of magnetic properties of Cr 0.25 Co 0.25 Zn 0.5 Fe 2 O 4 nano-sized particles on annealing temperature, studied by X-ray diffraction (XRD), AC magnetization and low temperature Mössbauer spectroscopy are reported in this paper.…”

mentioning

confidence: 60%

“…The radii of tetrahedral (r A ) and octahedral sites (r B ) calculated from the cation distribution obtained from Mössbauer studies [6] are 0.63 and 1.345 Å respectively, giving the value of the oxygen parameter u to be 0.3995. The nano-sized sample is superparamagnetic at room temperature.…”

Section: Resultsmentioning

confidence: 99%

Low temperature magnetic properties of Cr0.25Co0.25Zn0.5Fe2O4 nano particles

et al. 2008

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“…In determining the cation distribution at the B site, the area has been taken as a sum of the B1 and B2 sites. From the relative spectral areas which fix the Fe occupancy and using the known site preferences, cation distribution at tetrahedral A-site and octahedral B-site are estimated [8].…”

Section: Mössbauer Studiesmentioning

confidence: 99%

Low temperature Mössbauer and DC magnetization studies in nano-sized Ni substituted Co–Zn ferrites

et al. 2011

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Studies in the series of nano ferrites pertaining to the stoichiometry Ni x Co 0.5−x Zn 0.5 Fe 2 O 4 , (0≤ x ≤0.5) show that contrary to the trend in bulk Co-Zn and Ni-Zn ferrites, the observed saturation magnetization of Ni-Zn ferrite (x = 0.5) is larger than Co-Zn ferrite (x = 0) and are due to finite size effects. This is evident from calculations which show that the magnetic particle sizes are 1.6 nm for Co-Zn ferrite and 2.4 nm for Ni-Zn whereas their average crystallite sizes are 5 to 3 nm respectively. Low temperature Mössbauer spectroscopic studies show that this can be attributed to an increase in an ordered core with the increase in Ni content which is reflected as a corresponding increase in the saturation magnetization.

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Variation of structural and hyperfine parameters in nanoparticles of Cr-substituted Co-Zn ferrites

Cited by 53 publications

References 19 publications

Al and PEG Effect on Structural and Physicochemical Properties of CoFe2O4

Al and PEG Effect on Structural and Physicochemical Properties of CoFe2O4

Low temperature magnetic properties of Cr0.25Co0.25Zn0.5Fe2O4 nano particles

Low temperature Mössbauer and DC magnetization studies in nano-sized Ni substituted Co–Zn ferrites

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