Site occupancy dependence of magnetism in NiZn ferrites by the Mössbauer effect

Arshed, M.; Siddique, M.; Anwar-ul-Islam, M.; Butt, N. M.; Abbas, Tahir; Ahmed, Marya

doi:10.1016/0038-1098(94)00724-q

Cited by 36 publications

(7 citation statements)

References 6 publications

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“…This behavior is observed and reported in the Tables without interpretation in other researches [13,15]. An acceptable explanation can be achieved by referring to cationic distribution based on Mössbauer studies [16,17] of similar compositions. Those studies revealed that not all Ni ions should go to B-sites neither should all Zn ions exist in A-sites but a mixed cationic distribution may exist depending on the NiZn ratios and maybe other factors.…”

Section: Electrical Conductivitysupporting

confidence: 49%

A.C. and D.C. conductivity of NiZn ferrite nanoparticles in wet and dry conditions

Saafan

Meaz

El-Ghazzawy

et al. 2010

Journal of Magnetism and Magnetic Materials

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Section: Electrical Conductivitysupporting

confidence: 49%

A.C. and D.C. conductivity of NiZn ferrite nanoparticles in wet and dry conditions

Saafan

Meaz

El-Ghazzawy

et al. 2010

Journal of Magnetism and Magnetic Materials

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“…The line width (C) of the sextet for B-site is much broader than that of the A-site due to hyperfine field distribution at B-sites, whereas the C value of first sextet is also large as compared to their bulk counterpart. This indicates the small particle size and also the distribution of particle size [27]. The value of quadrupole splitting (D) of the as-prepared sample is found to be negligibly small (i.e., almost zero) showing the overall cubic symmetry between Fe 3?…”

Section: Mössbauer Spectroscopymentioning

confidence: 92%

Cation distribution and enhanced surface effects on the temperature-dependent magnetization of as-prepared NiFe2O4 nanoparticles

Nadeem

Siddique

2015

Appl. Phys. A

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Nickel ferrite, i.e., NiFe 2 O 4 , nanoparticles are synthesized by sol-gel method using urea as a neutralizing agent. The formation of spinel phase and crystal structure of the as-prepared sample is analyzed by X-ray diffraction and transmission electron microscope. In order to confirm phase formation and cation arrangement, room temperature 57 Fe Mössbauer spectroscopy is employed. The degree of inversion (i) estimated from the relative peak area is found to be 0.6, which confirms a mixed spinel structure of the asprepared sample. Zero-field-cooled/field-cooled measurements showed evidence of superparamagnetic behavior associated with the nanosized particles. Hysteresis loop measurements revealed temperature-dependent magnetic properties: The coercive field (H C ) decreases with increasing temperature and deviates from the Kneller's law for ferromagnetic nanostructures; and the saturation magnetization (M s ) follows modified Bloch's law in the temperature range between 25 and 400 K. However, below 25 K, an abrupt increase in magnetization of nanoparticles is observed. In order to understand this behavior, an additional contribution has to be added to the core magnetization to properly fit the data. Hence, a surface correction term to the Bloch's law is found to describe the temperature dependence of magnetization in the core-shell NiFe 2 O 4 nanoparticles.

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“…Starting from x = 25% the spectra were fitted to a broad sextet with linewidth between 0.6 and 0.8 mm/s, corresponding to Fe 3+ at the tetrahedral (A) sites, plus a hyperfine field (B HF ) distribution referring to Fe 3+ atoms at the octahedral (B) sites. The use of a distribution for fit B sites subspectra is due to the presence of different magnetic neighbours affecting the Fe atoms distinctly at these sites 6,11 . For these magnetic samples, the peak values of B HF are between 40.3 (5) to 44.3 (5) T for A sites, and vary between 14.4 (5) T and 41.0 (5) T for B sites.…”

Section: T (°C)mentioning

confidence: 99%

Structure and magnetic properties of granular NiZn-ferrite - SiO2

et al. 1999

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Granular systems composed by nanostructured magnetic materials embedded in a non-magnetic matrix present unique physical properties that depend crucially on their nanostructure. In this work, we have studied the structural and magnetic properties of NiZn-ferrite nanoparticles embedded in SiO2, a granular system synthesized by sol-gel processing. Samples with ferrite volumetric fraction x ranging from 6% to 78% were prepared, and characterized by X-ray diffraction, Mössbauer spectroscopy and vibrating sample magnetometry. Our results show the formation of pure stoichiometric NiZn-ferrite in the SiO2 matrix for x < 34%. Above these fraction, our samples presented also small amounts of Fe2O3. Mössbauer spectroscopy revealed the superparamagnetic behaviour of the ferrimagnetic NiZn-ferrite nanoparticles. The combination of different ferrite concentration and heat treatments allowed the obtaintion of samples with saturation magnetization between 1.3 and 68 emu/g and coercivity ranging from 0 to 123 Oe, value which is two orders of magnitude higher than the coercivity of bulk NiZn-ferrite

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Site occupancy dependence of magnetism in NiZn ferrites by the Mössbauer effect

Cited by 36 publications

References 6 publications

A.C. and D.C. conductivity of NiZn ferrite nanoparticles in wet and dry conditions

A.C. and D.C. conductivity of NiZn ferrite nanoparticles in wet and dry conditions

Cation distribution and enhanced surface effects on the temperature-dependent magnetization of as-prepared NiFe2O4 nanoparticles

Structure and magnetic properties of granular NiZn-ferrite - SiO2

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