Investigations on the temperature dependent electrical and magnetic properties of NiTiO3 by molten salt synthesis

Yuvaraj, S.; Nithya, V.; Fathima, K. Saiadali; Sanjeeviraja, C.; Selvan, G.; Arumugam, S.; Selvan, R. Kalai

doi:10.1016/j.materresbull.2012.12.001

Cited by 73 publications

(33 citation statements)

References 42 publications

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“…29) However, it exhibited weeak-ferromagnetism below 250 K in thin film or room temperature ferromagnetism in nanoparticles. 30,31) Thus, we suggest that room temperature ferromagnetism in Ni-doped Bi 0.5 K 0.5 TiO 3 nanocrystals may be originated from both intrinsic reason caused by the Ni ion solution in Bi 0.5 K 0.5 TiO 3 crystal and extrinsic reason caused by segregation of NiTiO 3 phase. /kg at applied magnetic field of 7 T. The average magnetic moment per formula unit in Bohr magneton (® B ) was calculated using the following equation ® B = (MxM S )/5585 where M is the molecular weight of the sample and M S is the saturation magnetization.…”

Section: Resultsmentioning

confidence: 85%

Room-Temperature Ferromagnetism in Nickel-Doped Wide Band Gap Ferroelectric Bi0.5K0.5TiO3 Nanocrystals

et al. 2015

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We report the effect of nickel doping on the structural, optical, and magnetic properties of Bi 0.5 K 0.5 TiO 3 nanocrystal. The X-ray diffraction results indicated that Ni was substituted into the Ti sites in Bi 0.5 K 0.5 TiO 3 and the NiTiO 3 phase was formed when Ni concentration was higher than 3 mol%. The band gap value decreased from 3.31 eV to 2.96 eV when the Ni concentration changed from 0 to 3 mol% and then increased with higher Ni concentration. Both weak-ferromagnetism and diamagnetism coexisted in un-doped Bi 0.5 K 0.5 TiO 3 samples. The ferromagnetic signal strongly influenced the paramagnetic signal for Ni-doped Bi 0.5 K 0.5 TiO 3 samples at room temperature. The room-temperature ferromagnetism in Ni-doped Bi 0.5 K 0.5 TiO 3 samples could be contributed by intrinsic reason due to presence of Ni ion in Bi 0.5 K 0.5 TiO 3 crystal and by extrinsic reason due to segregation of NiTiO 3 clusters when Ni concentration was over 3 mol% threshold. This method may provide a useful way to get both single-phase multiferroics and composite multiferroics materials.

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Section: Resultsmentioning

confidence: 85%

Room-Temperature Ferromagnetism in Nickel-Doped Wide Band Gap Ferroelectric Bi0.5K0.5TiO3 Nanocrystals

et al. 2015

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“…4 67 . The performed calculations confirm that in the studied material its electrical conduction observed at temperature below 700 K seems to be extrinsic type, governed by impurities, interstitials, etc.…”

Section: Structure and Electronic Properties Of Bulk Ilmenite Nitiomentioning

confidence: 99%

Vibrational and electronic peculiarities of NiTiO₃nanostructures inferred from first principle calculations

et al. 2015

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Structural, electronic and vibrational properties of nanostructured (NiTiO 3 ) n clusters were calculated by numerical models based on DFT and semi-empirical quantum chemistry codes. The clusters were built by using initial atomic positions of crystalline ilmenite which were relaxed to ensure stable and energetically favourable geometries. For the electronic properties, the semi-empirical PM6 parameterisation method was used to evaluate the HOMO-LUMO energy differences versus nanocrystal sizes. The quantum confinement effect was traduced on the electronic features with the cluster size reduction. Theoretical UV-vis absorption as well as the Raman spectra show drastic influence of surface on the electronic and the vibrational properties of nanoclusters. Theoretically it was proved that the powder NiTiO 3 exhibits patchwork of the properties of bulk ilmenite material, amorphous Ni-Ti-O structures and atoms located at the surface of the investigated cluster.

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“…The spinel structure includes a large family of compounds that exhibit a wide variety of physicochemical properties with important practical applications 2 . Thus, spinel oxides (AB2O4), pirochromite (MgCr2O4), and other related binary oxides have important technological applications, including their use as magnetic materials, high-temperature ceramics 3 , strengthening agents, sensor elements, interconnecting materials for solid oxide fuel cells, combustion catalysts, or catalytic supports [4][5][6][7][8] . For many of these applications, achievement of high surface area materials is greatly desired.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and optical band gap of Pirochromite (MgCr2O4) Nanoparticles by Stearic Acid Sol-Gel Method

Jafarnejad¹,

Khanahmadzadeh²,

Ghanbary³

et al. 2016

10.5267/j.ccl

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Pirochromite (MgCr2O4) nanoparticles were successfully prepared in this study. During synthesis of the pirochromite nanoparticles, a sol-gel was prepared by using magnesium acetate and potassium dichromate as magnesium and chromium sources and by using stearic acid as the network. Infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM), and energy-dispersive X-ray spectroscopy (EDX) were used for the elemental analysis, and diffuse reflectance spectroscopy (DRS) and vibrating sample magnetometer (VSM) were used in order to identify, provide a fuzzy diagnosis, and determine the size and morphology of the particles, as well as to analyze the optical and magnetic properties of the particles. The particle size of MgCr2O4 nanoparticles was observed to fall within a range of 39 nm-71 nm.

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Investigations on the temperature dependent electrical and magnetic properties of NiTiO3 by molten salt synthesis

Cited by 73 publications

References 42 publications

Room-Temperature Ferromagnetism in Nickel-Doped Wide Band Gap Ferroelectric Bi<sub>0.5</sub>K<sub>0.5</sub>TiO<sub>3</sub> Nanocrystals

Room-Temperature Ferromagnetism in Nickel-Doped Wide Band Gap Ferroelectric Bi<sub>0.5</sub>K<sub>0.5</sub>TiO<sub>3</sub> Nanocrystals

Vibrational and electronic peculiarities of NiTiO₃nanostructures inferred from first principle calculations

Synthesis, characterization and optical band gap of Pirochromite (MgCr2O4) Nanoparticles by Stearic Acid Sol-Gel Method

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Investigations on the temperature dependent electrical and magnetic properties of NiTiO3 by molten salt synthesis

Cited by 73 publications

References 42 publications

Room-Temperature Ferromagnetism in Nickel-Doped Wide Band Gap Ferroelectric Bi<sub>0.5</sub>K<sub>0.5</sub>TiO<sub>3</sub> Nanocrystals

Room-Temperature Ferromagnetism in Nickel-Doped Wide Band Gap Ferroelectric Bi<sub>0.5</sub>K<sub>0.5</sub>TiO<sub>3</sub> Nanocrystals

Vibrational and electronic peculiarities of NiTiO3nanostructures inferred from first principle calculations

Synthesis, characterization and optical band gap of Pirochromite (MgCr2O4) Nanoparticles by Stearic Acid Sol-Gel Method

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Vibrational and electronic peculiarities of NiTiO₃nanostructures inferred from first principle calculations