Transition metal titanium (Ti) doped LaFeO 3 nanoparticles for enhanced optical structural and magnetic properties

Sasikala, Ch.; Durairaj, N.; Baskaran, I.; Sathyaseelan, B.; Henini, M.; Manikandan, E.

doi:10.1016/j.jallcom.2017.04.133

Cited by 111 publications

(54 citation statements)

References 39 publications

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“…The results are in reliable with the earlier reported value of 2.10 eV. These small bandgap values of the prepared compounds are interesting for photocatalytic applications [25]. Figure 9 shows the emission and excitation spectra for a prepared perovskite ferrite samples.…”

Section: Optical Propertiessupporting

confidence: 91%

“…The existence of secondary phases and high concentrations of nonmagnetic ions (Ti 4+ ) can hide the domain wall motion [25]. The The observed change in magnetic properties, may be due to a high antiferromagnetic spin alignment of Fe 3+ -O 2− -Fe 3+ and Fe 4+ -O 2− -Fe 4+ super exchange interaction [25]. The substitution of Ti 4+ ions may create a greater number of Fe 3+ ions to ensure the charge impartiality which may enhance the double exchange (DE) interactions that results in higher magnetization (x = 0.25) [26].…”

Section: Magnetic Property Analysismentioning

confidence: 99%

“…In recently, a signi cant amount of dedication was remunerated to the perovskite-type ABO 3 transition-metal oxides (TMOs) in photocatalytic eld due to its trivial band gap (2.0-2.5 eV) and high chemical stability. In order to enhance the physical properties of the LaFeO 3 compounds various ways have been used to synthesis such as co-precipitation technique [25], polymer pyrolysis method [5], hydrothermal method [26], polymerizable complex route [27], and microwave assisted method [28]. Identifying the suitable dopants and optimized synthesis procedure could make reaction method.…”

Section: Introductionmentioning

confidence: 99%

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Conventional synthesis of perovskite structured LaTixFe1-xO3: A comprehensive evaluation on phase formation, opto-magnetic, and dielectrical properties

Raji

Kurapati

Ramachandran

et al. 2020

Preprint

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In the current study, we report a comprehensive evaluation of the microstructures, optical, dielectric and magnetic traits of Ti-substituted perovskite structured lanthanum ferrite with chemical compositions LaTixFe1−xO3 (x = 0, 0.05, 0.15, 0.25). X-ray diffraction with Rietveld refinement and Raman analysis confirmed that both pure and Ti-substituted LaFeO3 maintained single-phase orthorhombic phase with Pbnm symmetry. Fourier transform infrared spectroscopy (FTIR) studies revealed the information about the positions of the ions and their bonds within the lattice structure of the LaFeO3. The spherical shaped morphology of all products was confirmed by SEM. The quantitative chemical composition and their distribution were confirmed by EDAX and mapping. The UV-Vis spectroscopic studies showed an excitonic absorption edge at 590 nm is ascribed to the electronic transition from O2p→Fe3d. Optical band gap (Eg) values were assessed by applying Tauc schemes, showed that Eg values are in a narrow range (1.85–2.02 eV). The dielectric properties such as, dielectric constant (ε’), dielectric loss (tan δ) was examined by varying with temperature and frequency. The magnetic results revealed weak ferromagnetic nature trait at 300 K. The variation in Ms (saturation magnetization), Hc (coercivity) and Mr (remanence) values were observed with increasing Ti substitution level.

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Section: Optical Propertiessupporting

confidence: 91%

Section: Magnetic Property Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Conventional synthesis of perovskite structured LaTixFe1-xO3: A comprehensive evaluation on phase formation, opto-magnetic, and dielectrical properties

Raji

Kurapati

Ramachandran

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…The direct energy band gap ( E g ) is estimated by fitting the absorption spectral data to the straight transition equation by extrapolating the linear portions of the curve into αhν = A( hν − E g )½, where α is optical absorption coefficient, hν is the photon energy, E g is the direct bandgap and A is constant (Fig. 5b) 25,28,29 . The experimentally assessed direct energy band gaps of all perovskite nanomaterials are 1.15, 1.31, 1.34 and 1.32 eV for LaMnO 3 , La 0.95 Ce 0.05 MnO 3 , La 0.93 Ce 0.07 MnO 3 , and La 0.90 Ce 0.10 MnO 3 perovskites, respectively.…”

Section: Resultsmentioning

confidence: 99%

Physico-chemical properties and catalytic activity of the sol-gel prepared Ce-ion doped LaMnO3 perovskites

Ansari

Ahmad

Alam

et al. 2019

Sci Rep

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Ce-doped LaMnO 3 perovskite ceramics (La 1−x Ce x MnO 3 ) were synthesized by sol-gel based co-precipitation method and tested for the oxidation of benzyl alcohol using molecular oxygen. Benzyl alcohol conversion of ca. 25–42% was achieved with benzaldehyde as the main product. X-ray diffraction (XRD), thermogravimetric analysis (TGA), BET surface area, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (H 2 -TPR), temperature-programmed oxidation (O 2 -TPO), FT-IR and UV-vis spectroscopic techniques were used to examine the physiochemical properties. XRD analysis demonstrates the single phase crystalline high purity of the perovskite. The Ce-doped LaMnO 3 perovskite demonstrated reducibility at low-temperature and higher mobility of surface O 2 -ion than their respective un-doped perovskite. The substitution of Ce 3+ ion into the perovskite matrix improve the surface redox properties, which strongly influenced the catalytic activity of the material. The LaMnO 3 perovskite exhibited considerable activity to benzyl alcohol oxidation but suffered a slow deactivation with time-on-stream. Nevertheless, the insertion of the A site metal cation with a trivalent Ce 3+ metal cation led to an enhanced in catalytic performance because of atomic-scale interactions between the A and B active site. La 0.95 Ce 0.05 MnO 3 catalyst demonstrated the excellent catalytic activity with a selectivity of 99% at 120 °C.

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“…At low temperatures (~25 K), the moment of 0.5PUNCF was found to be 0.040 emu/g in both ZFC and FC. Surface anisotropy in 0.2PUNCF sample leads to high magnetization and low coercivity consistent with the magnetic properties of superparamagnetic nanoparticles [42][43][44][45][46][47][48]. …”

Section: Magnetic Measurementsmentioning

confidence: 62%

Enhanced magnetic properties of polymer-magnetic nanostructures synthesized by ultrasonication

Arul

Manikandan

Murmu

et al. 2017

Journal of Alloys and Compounds

Self Cite

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Polymer based nickel (Ni) and cobalt (Co) co-doped ferrites were prepared by adept ultrasonication route. Different concentrations of polymer [polyvinyl alcohol (PVA)] (0.2 g and 0.5 g) was added as a surfactant to the magnetic particles. The phase purity of Ni-Co ferrites (spinel structure) was confirmed by X-ray diffraction (XRD). Enhanced saturation magnetization of polymer based magnetic nanoparticles due to shape anisotropy and size. 0.2 wt% doped ferrite showed superparamagnetic characteristics with blocking temperature above room temperature. Hence, ultrasonication route is a rapid and effective technique for tailoring size and morphology of magnetic nanostructure that could be useful in magneticsensor applications.

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Transition metal titanium (Ti) doped LaFeO 3 nanoparticles for enhanced optical structural and magnetic properties

Cited by 111 publications

References 39 publications

Conventional synthesis of perovskite structured LaTixFe1-xO3: A comprehensive evaluation on phase formation, opto-magnetic, and dielectrical properties

Conventional synthesis of perovskite structured LaTixFe1-xO3: A comprehensive evaluation on phase formation, opto-magnetic, and dielectrical properties

Physico-chemical properties and catalytic activity of the sol-gel prepared Ce-ion doped LaMnO3 perovskites

Enhanced magnetic properties of polymer-magnetic nanostructures synthesized by ultrasonication

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