Role of Mg2+ and In3+ substitution on magnetic, magnetostrictive and dielectric properties of NiFe2O4 ceramics derived from nanopowders

Anantharamaiah, P.N.; Rao, B. Prerna; Shashanka, H.M.; Chelvane, J. Arout; Khopkar, Vijay; Sahoo, Balaram

doi:10.1039/d0cp05448h

Cited by 25 publications

(27 citation statements)

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“…We followed the previously established synthetic procedure to obtain the NFO, NMFO, and NIFO nanomaterials. 24 Briefly, a homogeneous solution of respective metal nitrates (Fe(NO 3 ) 3 • 9H 2 O, Ni(NO 3 ) 2 •6H 2 O, and Mg(NO 3 ) 2 •6H 2 O) with high purity was mixed with 75 mL of tartaric acid (1.5 moles per metal ion). The metal nitrates were weighed according to stoichiometry.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…The peaks situated at the diffraction angles of 18.55, 30.36, 35.77, 37.40, 43.44, 53.89, 57.42, and 63.07°are assigned to the (111), ( 220), (311), ( 222), (400), (422), (511), and (440) crystal planes of the cubic spinel structure, respectively. 24 The lattice parameters of the samples extracted from the XRD data were found to be 8.339, 8.347, and 8.374 Å for NiFe 2 O 4 , NiFe 1.8 Mg 0.2 O 4 , and NiFe 1.8 In 0.2 O 4 , respectively. A similar increase in the lattice parameter has been observed and reported for In-and Mg-substituted spinel ferrite systems.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…The intrinsic and Mg- and In-substituted Ni-ferrite (NiFe 2 O 4 , NiFe 1.8 Mg 0.2 O 4 , and NiFe 1.8 In 0.2 O 4 ) nanomaterials were synthesized by a tartrate-gel method. We followed the previously established synthetic procedure to obtain the NFO, NMFO, and NIFO nanomaterials . Briefly, a homogeneous solution of respective metal nitrates (Fe(NO 3 ) 3 ·9H 2 O, Ni(NO 3 ) 2 ·6H 2 O, and Mg(NO 3 ) 2 ·6H 2 O) with high purity was mixed with 75 mL of tartaric acid (1.5 moles per metal ion).…”

Section: Materials and Methodsmentioning

confidence: 99%

“…Recently, we have investigated the synthesis, structure, and magnetostrictive properties of nickel ferrite and Mg 2+ -and In 3+ -doped nickel ferrite samples sintered from their nanocrystalline powders. 24 The present study focused on elucidating the effect of cation site preference on the dielectric properties of NFO and Mg-and In-doped NFO. To gain a deeper understanding and accurately determine such site preference-induced effects, we relied on estimating the cation distribution and deriving a correlation between the dielectric properties and chemical cation distribution in these ferrites.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Also, studies on the temperature-dependent dielectric properties of nickel ferrite and its derivatives (mainly In 3+ - and Mg 2+ -substituted NFO) are limited and yet to be explored thoroughly. Recently, we have investigated the synthesis, structure, and magnetostrictive properties of nickel ferrite and Mg 2+ - and In 3+ -doped nickel ferrite samples sintered from their nanocrystalline powders . The present study focused on elucidating the effect of cation site preference on the dielectric properties of NFO and Mg- and In-doped NFO.…”

Section: Introductionmentioning

confidence: 99%

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Tunable Dielectric Properties of Nickel Ferrite Derived via Crystallographic Site Preferential Cation Substitution

et al. 2022

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We report on the tunable dielectric properties achieved in cation-substituted nickel ferrite (NiFe 2 O 4 ; NFO) by selectively engineering the crystallographic site occupation of the dopant cation in the NFO ceramics. The NFO, Mg-substituted NFO (NiMg 0.2 Fe 1.8 O 4 ; NMFO), and In-substituted NFO (NiIn 0.2 Fe 1.8 O 4 ; NIFO) nanocrystals were synthesized by employing a tartrate-gel chemical route, followed by calcination at 500 °C. High-resolution transmission electron microscopy (HRTEM) analyses indicate the crystal quality of NFO, NMFO, and NIFO nanomaterials. The HRTEM data revealed that all of the ferrite materials were nanocrystalline with sizes in the range of 15−25 nm. Coupled with HRTEM analyses, X-ray diffraction analyses indicate the formation of single-phase spinel-structured NFO, NMFO, and NIFO materials without any detectable impurities. Chemical analysis performed using Mossbauer spectroscopy indicates that Mg 2+ occupies the octahedral site, while In 3+ preferably occupies the tetrahedral site of the spinel-structured NFO. The Fourier transform infrared (FTIR) absorption bands corresponding to metal−oxygen (M−O) intrinsic stretching vibration in the octahedral unit (MO 6 ) and the tetrahedral unit (MO 4 ), respectively, were noted in all of the samples. However, the trend in the frequency shift of these bands in Mg-and In-substituted NFO materials is different due to the occupation of different sites of Mg and In as confirmed by Mossbauer studies. The electronic structure and chemical valence state analysis using X-ray photoelectron spectroscopy (XPS) corroborates with chemical bonding analyses performed by FTIR and cation distribution evaluation carried out by Mossbauer spectroscopy. The energy-dispersive X-ray spectrometry (EDS) data, in addition to XPS and FTIR analyses, further validate the formation of uniform and chemically homogeneous samples. The corresponding cation distribution revealed from Mossbauer studies correlates with the variation of dielectric properties of the doped NFO samples with respect to intrinsic NFO. At room temperature, the dielectric constant (ε) of NFO and NMFO is found to be nearly the same and constant over a wide range of frequencies. However, in NIFO, ε decreases with the applied frequency. The differences are attributed to the size effect and site preference of dopants (Mg 2+ and In 3+ ). Irrespective of the dopants, an increase in the temperature enhances the dielectric constant, which is due to an increase in the number of free charge carriers. A thermally activated electrical conduction mechanism was operative in NFO, NMFO, and NIFO materials. The activation energies for NFO, NFMO, and NIFO were 18.84, 34.48, and 57.14 meV, respectively. The enhanced dipolar effect of In 3+ at the tetrahedral site compared to Mg 2+ at the octahedral site may be the origin of the relatively higher value of activation energy in NIFO compared to intrinsic and Mg-substituted NFO.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: Materials and Methodsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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