The influence of milling and annealing on the structural and magnetic behavior of Nd2Fe14B/α-Fe magnetic nanocomposite

Pop, V.; Gutoiu, S.; Dorolti, E.; Leoștean, Cristian; Isnard, O.; Chicinaş, Ionel; Panâ, O.

doi:10.1016/j.jallcom.2013.07.194

Cited by 14 publications

(7 citation statements)

References 35 publications

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“…In general, XPS is a very useful technique in the compositional determination of surfaces. In the case of nanostructured materials that can contain several phases, through this method, when associated with Ar ions etching, complex quantitative compositional determinations can be obtained 50 . For the compositional analysis all the integral intensities were calibrated by using the relative sensitivities, transmission and electronic mean free path factors as given in CASA software database.…”

Section: Resultsmentioning

confidence: 99%

“…Each of the two samples were subject to consecutive etchings with Ar ions until the shape and intensity of XPS spectra remained unchanged. At this stage, the quantitative composition of samples can be calculated by taking into account the escape depths of each identified component 50 – 52 . To account this, the calculated integral intensities were divided to the corresponding escape depths expressed in nm.…”

Section: Resultsmentioning

confidence: 99%

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Insight into synthesis and characterisation of Ga0.9Fe2.1O4 superparamagnetic NPs for biomedical applications

Mesaros,

Garzón,

Nasui

et al. 2023

Sci Rep

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A Ga3+-substituted spinel magnetite nanoparticles (NPs) with the formula Ga0.9Fe2.1O4 were synthesized using both the one-pot solvothermal decomposition method (TD) and the microwave-assisted heating method (MW). Stable colloidal solutions were obtained by using triethylene glycol, which served as a NPs stabilizer and as a reaction medium in both methods. A narrow size distribution of NPs, below 10 nm, was achieved through selected nucleation and growth. The composition, structure, morphology, and magnetic properties of the NPs were investigated using FTIR spectroscopy, thermal analysis (TA), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and magnetic measurements. NPs with the expected spinel structure were obtained in the case of the TD method, while the MW method produced, additionally, an important amount of gallium suboxide. The NPs, especially those prepared by TD, have superparamagnetic behavior with 2.02 μB/f.u. at 300 K and 3.06 μB/f.u. at 4.2 K. For the MW sample these values are 0.5 μB/f.u. and 0.6 μB/f.u. at 300 K and 4.2 K, respectively. The MW prepared sample contains a secondary phase and very small NPs which affects both the dimensional distribution and the magnetic behavior of NPs. The NPs were tested in vitro on amniotic mesenchymal stem cells. It was shown that the cellular metabolism is active in the presence of Ga0.9Fe2.1O4 NPs and preserves an active biocompatible cytoskeleton.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Insight into synthesis and characterisation of Ga0.9Fe2.1O4 superparamagnetic NPs for biomedical applications

Mesaros,

Garzón,

Nasui

et al. 2023

Sci Rep

View full text Add to dashboard Cite

show abstract

“…In general, XPS is a very useful technique in the compositional determination of surfaces. In the case of nanostructured materials that can contain several phases, through this method, when associated with Ar ions etching, complex quantitative compositional determinations can be obtained [44]. For the compositional analysis all the integral intensities were calibrated by using the relative sensitivities, transmission and electronic mean free path factors as given in CASA software database.…”

Section: The Xps Analysis Of Samplesmentioning

confidence: 99%

“…Each of the two samples were subject to consecutive etchings with Ar ions until the shape and intensity of XPS spectra remained unchanged. At this stage, the quantitative composition of samples can be calculated by taking into account the escape depths of each identi ed component [44][45][46]. To account this, the calculated integral intensities were divided to the corresponding escape depths expressed in nm.…”

Section: The Xps Analysis Of Samplesmentioning

confidence: 99%

Insight into synthesis and characterisation of Ga0.9Fe2.1O4 superparamagnetic NPs for biomedical applications

Mesaros,

Garzón,

Nasui

et al. 2023

Preprint

View full text Add to dashboard Cite

A Ga3+-substituted spinel magnetite nanoparticles (NPs) with the formula Ga0.9Fe2.1O4 were synthesized using both the one-pot solvothermal decomposition method (TD) and the microwave-assisted heating method (MW). Stable colloidal solutions were obtained by using triethylene glycol, which served as a NPs stabilizer and as a reaction medium in both methods. A narrow size cridistribution of NPs, below 10 nm, was achieved through selected nucleation and growth. The composition, structure, morphology, and magnetic properties of the NPs were investigated using FTIR spectroscopy, thermal analysis (TA), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and magnetic measurements. NPs with the expected spinel structure were obtained in the case of the TD method, while the MW method produced, additionally, an important amount of gallium suboxide. The NPs, especially those prepared by TD, have superparamagnetic behavior. In the case of MW preparation, the presence of a secondary phase affects both the dimensional distribution and the magnetic behavior of NPs. The NPs were tested in vitro on amniotic mesenchymal stem cells. It was shown that the cellular metabolism is active in the presence of Ga0.9Fe2.1O4 NPs and also preserves an active biocompatible cytoskeleton.

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“…The peaks separation value was found to be 22.5 eV, which corresponds to the trivalent neodymium (Nd 3+ ) in Nd-O bonding. [43][44][45].…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

Neodymium-coated PECVD-designed silicon nanostructures: A comprehensive structural, morphological and spectroscopic investigation

Mefoued

Mahmoudi

Benrekaa

et al. 2022

Preprint

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We report the optical, structural, and spectroscopic properties of thermally evaporated neodymium oxide (Nd2O3) thin films deposietd on a nanostructured silicon (Si-ns) matrix. The Si-ns thin films were grown by depositing silicon nitride (SiN) thin films using plasma enhanced chemical vapour deposition (PECVD). The gas ratio R=NH3/SiH4 was varied between 2.5 and 5 to obtain different stoichiometries and Si amounts in the SiN layers. Two sets of samples were analysed. The first set comprised samples prepared with gas ratios R=2.5, 3, 4, and 5 and annealed at 900°C for 15 min. For the second set, R was 2 and 4 for the samples annealed at 1100°C for 2 h. Both sets were thermally treated under nitrogen (N2) ambient. The nanocrystalline formation and layer thickness were assessed by atomic force microscopy (AFM) and scanning electron microscopy (SEM). UV-Vis absorption spectra revealed that the reflectance was lower for the Nd2O3-coated samples than for to the uncoated ones. This trend remained unchanged after the annealing. Optical band gap (Eg) was found to increase with increasing R (2.5, 3, and 4) with Eg = 1.28, 1.31 and 1.55 eV respectively for annealed samples. Refinement of nanostructures size was observed with higher Eg values. The presence of Nd, Si, oxygen (O) and phosphorus (P) was confirmed by energy dispersive spectroscopy (EDS) and secondary ion mass spectrometry (SIMS) data. Moreover, X-ray diffraction (XRD) and Raman spectroscopy were employed to determine and confirm amorphous silicon (a-Si), crystalline silicon (c-Si), Nd2O3 and SiN phases present in the Nd2O3-SiN bilayers. Crystallite sizes for Nd and Si found to be 40.7 and 6.82 nm respectively. After the annealing process, a Raman shift toward lower wavenumbers was observed for Si peak. XPS data revealed the formation of Nd2O3 thin films with a Nd-O bonding incorporating trivalent Nd ions (Nd3+).

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The influence of milling and annealing on the structural and magnetic behavior of Nd2Fe14B/α-Fe magnetic nanocomposite

Cited by 14 publications

References 35 publications

Insight into synthesis and characterisation of Ga0.9Fe2.1O4 superparamagnetic NPs for biomedical applications

Insight into synthesis and characterisation of Ga0.9Fe2.1O4 superparamagnetic NPs for biomedical applications

Insight into synthesis and characterisation of Ga0.9Fe2.1O4 superparamagnetic NPs for biomedical applications

Neodymium-coated PECVD-designed silicon nanostructures: A comprehensive structural, morphological and spectroscopic investigation

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