Publication detail

Influence of La3+ on structural, magnetic, dielectric, electrical and modulus spectroscopic characteristics of single phase CoFe2-xLaxO4 nanoparticles

YADAV, R. KUŘITKA, I. VILČÁKOVÁ, J. HAVLICA, J. KALINA, L. URBÁNEK, P. MACHOVSKÝ, M. MASAŘ, M. HOLEK, M.

Original Title

Type

journal article in Web of Science

Language

English

Original Abstract

In this work, we have studied the influence of La3+ substitution on structural, magnetic, dielectric, electrical and modulus spectroscopic characteristics of cobalt ferrite nanoparticles synthesized by starch-assisted sol-gel combustion method. The powder X-ray diffraction analysis confirms the formation of single-phase CoFe2-xLaxO4 (x=0.00, 0.05, 0.10, 0.15, 0.20) spinel ferrite nanoparticles. Raman spectroscopy study also reveals the formation of single phase spinel ferrite crystal structure. The morphological feature of synthesized ferrite nanoparticle was observed by scanning electron microscopy that demonstrate formation of spherical nanoparticles with grain size 10-50 nm. The presence of constituent's, i.e., Co, Fe and La were authenticated by energy dispersive X-ray analysis. The magnetic parameters are measured by employing vibrating sample magnetometer. The saturation magnetization decreases with La3+ substitution, whereas coercivity shows anomalous behaviour. Cation redistribution in spinel ferrite nanoparticles are confirmed by X-ray photoelectron spectroscopy. The variation of dielectric constant (', ''), loss tangent (tanδ), ac conductivity (σ), electric modulus (M', M'') and impedance (Z', Z'') as a function of La3+ ion concentration and frequency has been investigated. The dielectric constant and ac conductivity increases with increase of La3+ substitution, whereas dielectric loss tangent exhibits anomalous behaviour. The modulus spectra reveal two semicircles associated with grain and grain boundary effects. The cole-cole plots in modulus formalism show that the electrical characteristics contribute from both the grains and grain boundaries. Modulus spectra suggest that the distribution of relaxation times and conduction mechanism are influenced by La3+ ion substitution in cobalt ferrite nanoparticles.

Keywords

Spinel Ferrites; Nanoparticles; Magnetic; Dielectric; Electrical Property

Authors

YADAV, R.; KUŘITKA, I.; VILČÁKOVÁ, J.; HAVLICA, J.; KALINA, L.; URBÁNEK, P.; MACHOVSKÝ, M.; MASAŘ, M.; HOLEK, M.

Released

15. 3. 2017

Publisher

Springer

Location

Nizozemsko

ISBN

0957-4522

Periodical

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS

Year of study

Number

State

Kingdom of the Netherlands

Pages from

9139

Pages to

9154

Pages count

BibTex

@article{BUT137500,
  author="Raghvendra Singh {Yadav} and Ivo {Kuřitka} and Jarmila {Vilčáková} and Jaromír {Havlica} and Lukáš {Kalina} and Pavel {Urbánek} and Michal {Machovský} and Milan {Masař} and Martin {Holek}",
  title="Influence of La3+ on structural, magnetic, dielectric, electrical and modulus spectroscopic characteristics of single phase CoFe2-xLaxO4 nanoparticles",
  journal="JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS",
  year="2017",
  volume="28",
  number="12",
  pages="9139--9154",
  doi="10.1007/s10854-017-6648-5",
  issn="0957-4522"
}