Comparison standards for the powder spectrum method; NiO and CdO

Ksanda, C. J.

doi:10.2475/ajs.s5-22.128.131

Cited by 11 publications

(2 citation statements)

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“…The substitution of Fe (II) ions for Co (II) and/or Ni (II) in the octahedral sites is expected to decrease the unit cell parameter a from 0.4303 nm for FeO [38] to 0.4291 for Co 0.3 Fe 0.7 O and 0.4270 nm for Ni 0.17 Co 0.21 Fe 0.62 O (these values were calculated using the Vegard's law [39] and the bulk CoO and NiO lattice parameters, that is, 0.4262 and 0.4170 nm, respectively). [40,41] The experimental lattice parameters for the CoFeO and NiCoFeO cores nicely match the expected ones, while for FeO cores a smaller unit cell was observed.…”

Section: Structural and Morphological Characterizationsupporting

confidence: 71%

3d Metal Doping of Core@Shell Wüstite@ferrite Nanoparticles as a Promising Route toward Room Temperature Exchange Bias Magnets

Muzzi

Albino

Petrecca

et al. 2022

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Nanometric core@shell wüstite@ferrite (Fe1−xO@Fe3O4) has been extensively studied because of the emergence of exchange bias phenomena. Since their actual implementation in modern technologies is hampered by the low temperature at which bias is operating, the critical issue to be solved is to obtain exchange‐coupled antiferromagnetic@ferrimagnetic nanoparticles (NPs) with ordering temperature close to 300 K by replacing the divalent iron with other transition‐metal ions. Here, the effect of the combined substitution of Fe(II) with Co(II) and Ni(II) on the crystal structure and magnetic properties is studied. To this aim, a series of 20 nm NPs with a wüstite‐based core and a ferrite shell, with tailored composition, (Co0.3Fe0.7O@Co0.8Fe2.2O4 and Ni0.17Co0.21Fe0.62O@Ni0.4Co0.3Fe2.3O4) is synthetized through a thermal‐decomposition method. An extensive morphological and crystallographic characterization of the obtained NPs shows how a higher stability against the oxidation process in ambient condition is attained when divalent cation doping of the iron oxide lattice with Co(II) and Ni(II) ions is performed. The dual‐doping is revealed to be an efficient way for tuning the magnetic properties of the final system, obtaining Ni‐Co doped iron oxide core@shell NPs with high coercivity (and therefore, high energy product), and increased antiferromagnetic ordering transition temperature, close to room temperature.

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Section: Structural and Morphological Characterizationsupporting

confidence: 71%

3d Metal Doping of Core@Shell Wüstite@ferrite Nanoparticles as a Promising Route toward Room Temperature Exchange Bias Magnets

Muzzi

Albino

Petrecca

et al. 2022

Small

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“…CdO powders and films have n‐type semiconducting properties, electrical resistivity in the order of 10 −2 −10 −4 Ω cm and mobility as high as μ = 146 cm 2 V −1 s −1 with N = 1.5 × 10 20 cm −3 . In addition, CdO has a high optical transmittance in the visible region of the solar spectrum along with a refractive index of 2.49 . Depending on the deviation from ideal CdO stoichiometry (e.g., due to cadmium interstitials Cd (1 + X ) O or oxygen vacancies CdO (1 − X ) ), its direct band gap varied from 2.2 to 2.5 eV and its indirect band gap varied from 1.36 to 1.98 eV .…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, optical, and dielectric properties of polyvinyl chloride/cadmium oxide nanocomposite films

et al. 2014

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Nano‐sized cadmium oxide (CdO) was synthesized using a sol–gel method and mixed with poly(vinyl chloride) (PVC). X‐ray diffraction and high‐resolution transmission electron microscopy measurements indicated that the average particle size of the CdO is about 70.18 nm. Scanning electron microscopy images revealed a good dispersion of CdO nanoparticles on the surface of the PVC films. The optical energy band gap (Eg) showed a decrease from 5.08 to 4.88 eV with increasing the CdO content. The refractive index dispersion of the nanocomposite films was found to obey the single oscillator model. The dispersion parameters were changed by CdO incorporation. According to the frequency and temperature dependence of the dielectric constant (ε′), the observed αa‐relaxation peaks were assigned to the micro‐Brownian motion of the polymer main chains. The influence of CdO nanoparticles content on the ac conductivity and the activation energy of PVC nanocomposite films were discussed. It was found that both dielectric and optical properties were reinforced by the adding of CdO nanoparticles to the PVC matrix. Finally, the results of the present system are compared with those of similar materials. POLYM. COMPOS., 35:1842–1851, 2014. © 2014 Society of Plastics Engineers

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b1420, II.1.1 Simple oxides

Pies¹,

Weiss²

Key Element: O. Part 1

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Comparison standards for the powder spectrum method; NiO and CdO

Cited by 11 publications

References 0 publications

3d Metal Doping of Core@Shell Wüstite@ferrite Nanoparticles as a Promising Route toward Room Temperature Exchange Bias Magnets

3d Metal Doping of Core@Shell Wüstite@ferrite Nanoparticles as a Promising Route toward Room Temperature Exchange Bias Magnets

Synthesis, characterization, optical, and dielectric properties of polyvinyl chloride/cadmium oxide nanocomposite films

b1420, II.1.1 Simple oxides

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