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Influence of La3+ on structural, magnetic, dielectric, electrical and modulus spectroscopic characteristics of single phase CoFe2−xLaxO4 nanoparticles
Authors
A Chandran
A Murugesan
+85 more
A Poorbafrani
A Sattar
A Tabib
AV Humbe
BK Bammannavar
BP Jacob
C Murugesan
C Singh
C Sujatha
DC Sinclair
DK Pradhan
DM Jnaneshwara
DS Nikam
DS Nikam
G Datt
G Wang
HS Aziz
HS Aziz
HZ Duan
Ivo Kuřitka
J Gröttrup
J Mao
J Xie
Jarmila Vilcakova
Jaromir Havlica
K Kamala Bharathi
K Rasool
Kalpana Panwar
KS Lohar
L Kumar
Lukas Kalina
M Ajmal
M Amin
M Hashim
M Najim
MA Ahmed
Martin Holek
MD Rahaman
Michal Machovsky
Milan Masař
MJ Iqbal
MM Costa
MM Costa
MU Rana
N Kumari
N Ortega
N Sharma
P Kumar
P Samoila
P Samoila
P Thakur
Pavel Urbánek
R Ahmad
R Indhrajothi
Raghvendra Singh Yadav
RC Kambale
RC Kambale
RK Panda
RN Bhowmik
RS Yadav
RS Yadav
S Jauhar
S Joshi
S Nasri
S Thota
S Verma
SF Mansour
SF Mansour
SG Kakade
SK Gore
SK Mandal
SM Patange
V Jagadeesha Angadi
V Mameli
V Postica
VJ Sawant
W Zhang
X Wu
Y Cao
Y Pu
Y Yafet
YK Mishra
Z Liua
ZK Karakas
ZZ Lazarevic
Publication date
8 September 2017
Publisher
'Springer Science and Business Media LLC'
Doi
Cite
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 (ϵ′, ϵʺ), loss tangent (tanδ), ac conductivity (σ), electric modulus (M′, Mʺ) and impedance (Z′, Zʺ) 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. © 2017, Springer Science+Business Media New York.Ministry of Education, Youth and Sports of the Czech Republic-Program NPU I [LO1504
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Last time updated on 21/10/2017
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info:doi/10.1007%2Fs10854-017-...
Last time updated on 02/01/2020