Ferromagnetic properties of Fe-substituted ZnO-based magnetic semiconductor

Ahn, Geun Young; Park, Seung-Iel; Kim, Sam Jin; Kim, Chul Sung

doi:10.1016/j.jmmm.2006.02.135

Cited by 21 publications

(8 citation statements)

References 10 publications

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“…While for type B, it would be δ ∼ = 1.1 mm/s and ∼ = 1.0 mm/s. The later values are consistent with Fe 2+ ions in tetrahedral coordination, as expected for substitutional sites in ZnO, and are similar to those observed by Ahn et al [7] in samples prepared by solid state reaction at 1200 • C. On the other hand, our spectra are similar to those reported recently by Lin et al [8] for Fe-doped ZnO prepared by mechanical milling at low iron concentrations. The authors also fit their spectra with two quadrupole doublets assigning them to Fe +2 and Fe +3 cations at Zn sites in the zincite ZnO phase.…”

Section: Sem Imagessupporting

confidence: 92%

Mössbauer characterization of Fe-doped ZnO prepared by mechanical milling

et al. 2007

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The preparation of massive oxides Zn 1 − x Fe x O by means of mechanical milling in diverse gaseous atmospheres and starting with different powder mixtures was investigated. ZnO powder with 10 at.% admixture of Fe, FeO or Fe 2 O 3 , were milled during 1, 4 or 16 h and characterized by X-ray diffraction and Mössbauer spectroscopy. Different phases were obtained according to the initial conditions (precursor used, atmosphere, etc.) and phase's formation enthalpies.

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Section: Sem Imagessupporting

confidence: 92%

Mössbauer characterization of Fe-doped ZnO prepared by mechanical milling

et al. 2007

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“…The (ZnO(I)) called values are consistent with Fe 2+ ions in tetrahedral coordination, as expected for substitutional sites in ZnO. Similar results were observed by Ahn et al [12] in samples prepared by solid state reaction at 1,200 • C and Lin et al [9] for Fe-doped ZnO prepared by mechanical milling at low iron concentrations. As it was discussed by Verdier et al [5] on the formation on Fe 2+ during milling hematite with ZnO to obtain the spinel ZnFe 2 O 4 , we must analyzed the presence of both valence state of Fe in our results.…”

Section: Mössbauer Spectrometrysupporting

confidence: 87%

Mössbauer study on Zn1 − x Fe x O semiconductors prepared by high energy ball milling

et al. 2009

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We present the preparation of massive Zn 1−x Fe x O ternary oxides using the mechanical mill. The Fe atom is a particular dopant since it presents two different oxidation states which allow us to vary the starting materials: Fe 2 O 3 , α-Fe or FeO. Parameters such as initial concentrations, atmosphere and milling times were varied. X-ray diffraction and 57 Fe Mössbauer spectrometry (MS) were applied in order to analyze the structure evolution and iron incorporation in the wurtzite crystalline structure with milling time. At final stages, Fe atoms seem to be incorporated in the ZnO structure for those samples milled under Ar atmosphere. In all cases, two paramagnetic components, attributed to Fe atoms in both valence states, were observed by MS.

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“…Following these, several other O-DMS based on SnO 2 , Cu 2 O and perovskite oxides of BaTiO 3 , SrTiO 3 , LaTiO 3 , and KTaO 3 have been reported [8]. It is noteworthy that for the same Fe-concentrations, Fe-doped ZnO exhibits ferromagnetism at room temperature [9], while enriched 57 Fe-doped ZnO exhibits a paramagnetic Curie transition at 2.7 K [10]. Although most of these materials exhibit FM with T C > 300 K, in some cases the observed FM are not intrinsic.…”

Section: Introductionmentioning

confidence: 73%