Effect of Particle Size on Hyperfine Fields in Cr‐Substituted Nano Co‐Zn Ferrite

Sharma, Ram Kripal; Suwalka, Omprakash; Lakshmi, N.; Venugopalan, K.

doi:10.1080/15533170500524546

Cited by 7 publications

(1 citation statement)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ZnFe 2 O 4 has the normal spinel structure [8] in which Zn 2+ ions occupy the tetrahedral sites, and all the Fe 3+ ions occupy octahedral sites. ZnFe 2 O 4 exhibit good dielectric and magnetic properties; hence these ferrites have a great importance from the application point of view, where these are widely used in many ferrite devices and production of electronic and magnetic components, converters, and electromagnetic wave absorbers [9].…”

Section: Introductionmentioning

confidence: 99%

Study of the Dielectric Behaviour of Cr-Doped Zinc Nano Ferrites Synthesized by Sol-Gel Method

Lakshmi¹,

Kumar²,

Thyagarajan³

2016

AMPC

View full text Add to dashboard Cite

The series of Cr-Zn nano ferrites having the general composition Cr x ZnFe 2−x O 4 (0 ≤ x ≤ 0.5) have been synthesized successfully in the nanocrystalline form using the sol-gel method. The samples were sintered at 900˚C for 3 hours. The effect of chromium substitution on dielectric properties of Zn-ferrites is reported in this paper. The analysis of XRD patterns revealed the formation of single phase cubic spinel structure for all the Cr-Zn ferrite samples. The FTIR spectra show two strong absorption bands in the range of 400-600 cm −1 , which corroborate the spinel structure of the samples. The average grain size was found to be in the nanometer range and of the order of 43-63 nm obtained using TEM images. The lattice parameter and crystallite size decrease with increase in Cr concentration (x). The investigation on dielectric constant (ε'), dissipation factor (D) and ac conductivity (σ ac) was carried out at a fixed frequency 1 kHz and in the frequency range of 100 Hz to 1 MHz at room temperature using LCR meter. The plots of dielectric constant (ε') versus frequency show the normal dielectric behavior of spinel ferrites. The value of ac conductivity (σ ac) increases with increase in frequency for all the compositions. The appearance of the peak for each composition in the dissipation factor versus frequency curve suggests the presence of relaxing dipoles in the Cr-Zn nano ferrite samples. It is also found that the shifting of the relaxation peak towards lower frequency side with an increase in chromium content (x) is due to the strengthening of dipole-dipole interactions. The composition and frequency dependence of the dielectric constant, dielectric loss and ac-conductivity are explained based on the Koop's two-layer model, Maxwell-Wagner polarization process, and Debye relaxation theory.

show abstract

Section: Introductionmentioning

confidence: 99%

Study of the Dielectric Behaviour of Cr-Doped Zinc Nano Ferrites Synthesized by Sol-Gel Method

Lakshmi¹,

Kumar²,

Thyagarajan³

2016

AMPC

View full text Add to dashboard Cite

show abstract

Effect of particle size and alloying with different metals on 57Fe Mössbauer spectra

et al. 2009

View full text Add to dashboard Cite

Effect of particle size and alloying with different metals on 57Fe Mössbauer spectra

et al. 2009

View full text Add to dashboard Cite

Iron nanoparticles of various sizes have been synthesized using the chemical route which involves the preparation of iron bipyridine complexes in presence of different capping agents followed by thermal decomposition at 450 • C in inert atmosphere. The bimetallic nanoalloys of Fe with Mg and Pd have also been prepared by following the same route. The resulting nanoparticles have been characterized by EDX-RF, XRD, AFM and 57 Fe Mössbauer spectroscopy. The appearance of quadrupole doublets in the Mössbauer spectra of Fe nanoparticles indicates the absence of magnetic interaction and variation in parameters is due to the varying particle size. The Mössbauer spectrum of Fe-Mg 2 bimetallic nanoalloy shows two doublets indicating the presence of superparamagnetism. The two doublets can be attributed to change in s-electron density of iron resulting from its two neighboring magnesium atoms. Fe-Pd nanoalloy Mössbauer spectrum is characterized by having a superparamagnetic doublet and a ferromagnetic sextet.

show abstract

Effect of Particle Size on Hyperfine Fields in Cr‐Substituted Nano Co‐Zn Ferrite

Cited by 7 publications

References 10 publications

Study of the Dielectric Behaviour of Cr-Doped Zinc Nano Ferrites Synthesized by Sol-Gel Method

Study of the Dielectric Behaviour of Cr-Doped Zinc Nano Ferrites Synthesized by Sol-Gel Method

Effect of particle size and alloying with different metals on 57Fe Mössbauer spectra

Effect of particle size and alloying with different metals on 57Fe Mössbauer spectra

Contact Info

Product

Resources

About