Properties of Gd2O3 nanoparticles studied by hyperfine interactions and magnetization measurements

Correa, Eduardo; Bosch-Santos, B.; Cavalcante, F. H. M.; Correa, Bruno Santos; Freitas, R. S.; Carbonari, A. W.; Potiens, M.P.A.

doi:10.1063/1.4943601

Cited by 26 publications

(10 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…At 10 K GFO-MW and GCFO-MW samples reveal a similar value while an important increase of saturation value characterizes GFMO-MW sample. It is worth to notice that the traces of Gd 2 O 3 revealed in GFMO-MW sample should not affect the saturation magnetization values because no ferromagnetic-like contribution is expected from Gd 2 O 3 nanoparticles [33]. Thus, it can be concluded that also for the MW series Mg substitution affects, in a complex way, the main Fe magnetic sublattice, like in the case of P series.…”

Section: )mentioning

confidence: 90%

Role of non-magnetic dopants (Ca, Mg) in GdFeO3 perovskite nanoparticles obtained by different synthetic methods: structural, morphological and magnetic properties

Ruffo

Mozzati

Albini

et al. 2020

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

GdFeO3 perovskite attracted large interest in different fields thanks to peculiar magnetic and optical properties that are further tunable by means of doping processes and achievable on both Gd and Fe sites or by properly choosing the synthesis routes. In this paper, nanometric GdFeO3 compounds, undoped and doped with diamagnetic Ca2+ and Mg2+ ions, were synthesized by microwave assisted, sol–gel, and polyol syntheses and characterized by X-ray diffraction, showing solid solutions formation. Raman spectroscopy allowed us to confirm, from peak enlargements, the Ca and Mg substitution on Gd and Fe sites, respectively. The magnetic data showed the presence of magnetic domains as consequence of doping with diamagnetic ions, which seem to play a crucial role in the magnetic activity of the compounds. A superparamagnetic behaviour is evidenced; nevertheless, its intrinsic character is not definitely demonstrated. Indeed, the possible presence of traces of magnetic impurities, which are easily obtainable in these samples, such as iron oxides, must be taken into account.

show abstract

Section: )mentioning

confidence: 90%

Role of non-magnetic dopants (Ca, Mg) in GdFeO3 perovskite nanoparticles obtained by different synthetic methods: structural, morphological and magnetic properties

Ruffo

Mozzati

Albini

et al. 2020

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

show abstract

“…In combined electric quadrupole plus magnetic dipole interactions, the angle ( between directions of and can also be determined. Details regarding the experimental methodology, particularly PAC measurements on metal and oxides, can be found elsewhere 51 , 65 – 68 . Radioactive nuclei are added to samples to be measured by PAC through several methods.…”

Section: Methodsmentioning

confidence: 99%

Crystalline and magnetic properties of CoO nanoparticles locally investigated by using radioactive indium tracer

Santos

Cabrera-Pasca

Costa

et al. 2021

Sci Rep

View full text Add to dashboard Cite

We herein report a comprehensive investigation on the magnetic, structural, and electric properties of CoO nanoparticles with different sizes by local inspection through hyperfine interactions measured in a wide range of temperatures (10–670 K) by using radioactive $$^{111}$$ 111 In($$^{111}$$ 111 Cd) tracers with the perturbed angular correlations technique. Small cobalt oxide nanoparticles with the characteristic size of 6.5 nm have been prepared by the wet chemical route that turned out to be essential to incorporate radioactivity tracers during nucleation and growth of the particles. Nanocrystalline samples with 22.1 nm size were obtained by thermal treatments under low pressure of helium at 670 K. The hyperfine data were correlated with X-ray diffraction, ZFC–FC magnetic measurements, and transmission electron microscopy to describe the structure, magnetic properties, size, and shape of samples. An analysis of the temperature evolution of hyperfine parameters revealed that the structural distortion and the magnetic disorder in the core and on the surface layer play an important role in the magnetic behavior of CoO nanoparticles.

show abstract

“…In combined electric quadrupole plus magnetic dipole interactions, the angle (β between directions of V zz and B h f can also be determined. Details regarding the experimental methodology, particularly PAC measurements on metal and oxides, can be found elsewhere 48,[64][65][66][67] . Radioactive nuclei are added to samples to be measured by PAC through several methods.…”

Section: Perturbed Angular Correlation Technique: a Brief Overviewmentioning

confidence: 99%

Crystalline and magnetic properties of CoO nanoparticles locally investigated by using radioactive indium tracer

Santos

Cabrera-Pasca

Costa

et al. 2021

Preprint

View full text Add to dashboard Cite

We herein report a comprehensive investigation on the magnetic, structural, and electric properties of CoO nanoparticles with different sizes by local inspection through hyperfine interactions measured in a wide range of temperatures (10-670 K) by using radioactive 111In( 111Cd) tracers with the perturbed angular correlations (PAC) technique. Small cobalt oxide nanoparticles with 6.5 nm have been prepared by the wet chemical route, which has shown essential to incorporate radioactivity tracers during nucleation and grown syntheses. Nanocrystalline samples with 22 nm size were obtained by thermal treatments under low pressure of helium at 670 K. The hyperfine data were correlated with X-ray diffraction (XRD), ZFC-FC magnetic measurements and transmission electron microscopy (TEM) to describe the structure, magnetic properties, size, and shape of samples. An analysis of the temperature evolution of hyperfine parameters revealed that the structural distortion and the magnetic disorder in the core and on the surface layer play an important role in the magnetic behavior of CoO nanoparticles.

show abstract

Properties of Gd2O3 nanoparticles studied by hyperfine interactions and magnetization measurements

Cited by 26 publications

References 11 publications

Role of non-magnetic dopants (Ca, Mg) in GdFeO3 perovskite nanoparticles obtained by different synthetic methods: structural, morphological and magnetic properties

Role of non-magnetic dopants (Ca, Mg) in GdFeO3 perovskite nanoparticles obtained by different synthetic methods: structural, morphological and magnetic properties

Crystalline and magnetic properties of CoO nanoparticles locally investigated by using radioactive indium tracer

Crystalline and magnetic properties of CoO nanoparticles locally investigated by using radioactive indium tracer

Contact Info

Product

Resources

About