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Role of Mg and In substitution on magnetic, magnetostrictive and dielectric properties of NiFeO ceramics derived from nanopowders
Ist Teil von
Physical chemistry chemical physics : PCCP, 2021-01, Vol.23 (2), p.1694-175
Erscheinungsjahr
2021
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The effect of Mg
2+
and In
3+
substitution on the structural, magnetic, magnetostrictive and dielectric properties of NiFe
2
O
4
samples derived through sintering of nanocrystalline ceramic powders is investigated. Namely, NiFe
2
O
4
, NiMg
0.2
Fe
1.8
O
4
and NiIn
0.2
Fe
1.8
O
4
nanopowders were synthesized by a tartrate-gel route followed by calcination at 500 °C, pelletization and sintering at 1200 °C for 2 h. The average particle size was found to decrease from ∼13 nm (for NiFe
2
O
4
) to ∼9 nm and ∼7 nm for as-synthesized Mg
2+
and In
3+
substituted NiFe
2
O
4
samples (after calcination), respectively. However, after sintering a better grain growth occurs for the In
3+
substituted sample, as confirmed through the microscopy and dielectric results. Due to the replacement of smaller Fe
3+
cations by larger In
3+
and Mg
2+
cations at the tetrahedral (T
d
) and octahedral (O
h
) interstitial positions, respectively, in the spinel structure of NiFe
2
O
4
, the lattice parameters increase in both the cases. The T
d
site occupation of In
3+
leads to higher magnetization for the NiIn
0.2
Fe
1.8
O
4
sample, but O
h
site occupation of Mg
2+
leads to lower magnetization for the NiMg
0.2
Fe
1.8
O
4
sample, in comparison to the pure NiFe
2
O
4
sample. Furthermore, the Curie temperatures (
T
C
) and magnetocrystalline anisotropy constants (
K
1
) for both the samples are considerably lower than the parent compound, with all the parameters being the lowest for the In
3+
substituted sample because the T
d
occupation of non-magnetic In
3+
drastically decreases the A-O-B magnetic superexchange interactions. The above alteration to the magnetic interactions alters the magnitude of maximum magnetostriction (
λ
max
), which is explained based on the occupation of the Mg
2+
and In
3+
cations in our samples. The obtained magnetostriction properties of our samples are very useful for magnetostriction based sensor application.
The effect of Mg
2+
and In
3+
substitution on the structural, magnetic, magnetostrictive and dielectric properties of NiFe
2
O
4
samples derived through sintering of nanocrystalline ceramic powders is investigated.
Sprache
–
Identifikatoren
ISSN: 1463-9076
eISSN: 1463-9084
DOI: 10.1039/d0cp05448h
Titel-ID: cdi_rsc_primary_d0cp05448h
Format
–
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