Structural and magnetic characterization of (Zn1-x-yFexCoy)O

Tupan, Lilian Felipe da Silva; Valerio-Cuadros, Marlon Ivan; Oliveira, Azauri Albano de; Souza, Antônio Oliveira de; Barco, Reginaldo; Ivashita, Flávio F.; Passamani, E. C.; Baggio-Saitovitch, E.; Paesano, Andrea

doi:10.1007/s10751-019-1571-1

Cited by 1 publication

(4 citation statements)

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“…Materials 2020, 13, x FOR PEER REVIEW 9 of 15 zinc in the distorted 2b site in the wurtzite lattice). This interpretation is also corroborated by our study on the Zn1-x-yFexCoyO system [23]. The quadrupole splitting (EQ) values are comparable to the average values reported in the literature [24], where the authors also considered two doublets for fitting their spectra of (Zn, Fe)O solid solutions.…”

Section: Mössbauer Spectroscopysupporting

confidence: 90%

“…Analyzing the evolution with x of the subspectral areas-which reveals a tendency to increase Doublet II at the expense of Doublet I-it is plausible to attribute Doublet I to isolated iron atoms and Doublet II to iron atoms with one or more neighboring iron atoms (in every case, iron substituting zinc in the distorted 2b site in the wurtzite lattice). This interpretation is also corroborated by our study on the Zn 1-x-y Fe x Co y O system [23].…”

Section: Mössbauer Spectroscopysupporting

confidence: 85%

“…The sharp peak associated with the spin freezing temperature shifts about 4 K (= ΔT f ) to higher temperatures when the frequency of the probe field increases (Δf ~ 10 kHz). Interestingly, these '(T, f) curves are similar to those obtained by us for a Zn0.95Fe0.05O sample prepared by a different synthesis method [23].…”

Section: Magnetic Characterizationsupporting

confidence: 85%

“…The spectra here obtained are similar to those reported by other authors for iron diluted in zinc oxide [24] and by us for Zn1-x-yFexCoyO samples [23]. They were fitted with two doublets (Doublet I and Doublet II), i.e., only paramagnetic components, and the hyperfine parameters are listed in Table 3.…”

Section: Mö Ssbauer Spectroscopysupporting

confidence: 84%

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Spin-Glass Transitions in Zn1-xFexO Nanoparticles

et al. 2020

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Monophasic Zn1-xFexO nanoparticles with wurtzite structure were synthesized in the 0 ≤ x ≤ 0.05 concentration range using a freeze-drying process followed by heat treatment. The samples were characterized regarding their optical, structural, and magnetic properties. The analyses revealed that iron doping of the ZnO matrix induces morphological changes in the crystallites. Iron is substitutional for zinc, trivalent and distributed in the wurtzite lattice in two groups: isolated iron atoms and iron atoms with one or more neighboring iron atoms. It was also shown that the energy band gap decreases with a higher doping level. The samples are paramagnetic at room temperature, but they undergo a spin-glass transition when the temperature drops below 75 K. The magnetic frustration is attributed to the competition of magnetic interactions among the iron moments. There are a superexchange interaction and an indirect exchange interaction that is provided by the spin (and charge) itinerant carriers in a spin-polarized band situated in the vicinity of the Fermi level of the Fe-doped ZnO semiconductor. The former interaction actuates for an antiferromagnetic coupling among iron ions, whereas the latter constitutes a driving force for a ferromagnetic coupling that weakens, decreasing the temperature. Our results strongly contribute to the literature because they elucidate the controversies reported in the literature for the magnetic state of the Fe-doped ZnO system.

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Section: Mössbauer Spectroscopysupporting

confidence: 90%

Section: Mössbauer Spectroscopysupporting

confidence: 85%

Section: Magnetic Characterizationsupporting

confidence: 85%

Section: Mö Ssbauer Spectroscopysupporting

confidence: 84%

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