X-ray absorption spectroscopy of Mn doped ZnO thin films prepared by rf sputtering technique

Yadav, Ashok K.; Haque, S. Maidul; Shukla, D. K.; Choudhary, R. J.; Jha, S. N.; Bhattacharyya, D.

doi:10.1063/1.4936398

Cited by 23 publications

(11 citation statements)

References 38 publications

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“…In summary, Mn incorporation into the ZnO structure was confirmed from the XANES and EXAFS fitting. These results match well with those shown by Yadav et al (2015).…”

Section: Figuresupporting

confidence: 92%

Coupling between γ-irradiation and synchrotron-radiation-based XAFS techniques for studying Mn-doped ZnO nanoparticles

Imam¹,

Harfouche²,

Azab³

et al. 2022

J Synchrotron Rad

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γ-Irradiation and synchrotron-radiation-based X-ray absorption fine-structure (XAFS) spectroscopy have been used to induce structure disorder through the interaction of γ-rays (200 kGy) with fabricated Mn-doped ZnO nanoparticles (NPs) and then to examine thoroughly the resultant structural change. The extracted electronic/fine XAFS structural parameters reflect a compositional and γ-irradiation co-dependence. The average crystal structure of samples prepared by the sol-gel method was investigated by X-ray diffraction (XRD). A detailed structural XRD data analysis was carried out by applying a Rietveld refinement using the MAUD program. XAFS spectra were collected at the Zn K-edge (9659 eV) in transmission mode and at the Mn K-edge (6539 eV) in fluorescence mode. Direct evidence of the solubility of Mn ions in the ZnO structure was demonstrated by fitting the extended-XAFS (EXAFS) signal. Near-edge XAFS (XANES) analysis provided the oxidation states of Zn and Mn ions through fingerprint XANES spectra of the sample along with those of standard compounds. Linear combination fitting showed that the most fit chemical forms of Zn and Mn in the samples are ZnO and MnO, respectively. The oxidation states of both Zn and Mn XAFS absorbers were confirmed from pre-edge fitting. The results of the magnetic measurements were explained in light of the average and electronic/local structural information obtained from XRD, XANES and EXAFS techniques. The magnetic properties of the samples translate into an induced change in the average crystal and electronic/local structures upon Mn concentration change and γ-irradiation. XRD confirmed the successful preparation of hexagonal Mn-doped ZnO NPs with a crystallite size in the range 33–41 nm. Both XRD and EXAFS analysis detected a minor amount of Mn3O4 as a secondary phase. XANES and EXAFS provided information exploring the outstanding potential of the utilized protocol for detecting precisely the presence of the secondary phase of Mn3O4, which changes with Mn content (x). Mean-square relative displacement (σ2) values extracted from the EXAFS fitting were found to grow for Zn–Zn/Mn paths demonstrating the substitution of Mn/Zn into Zn crystal sites. The EXAFS analysis explains the reasons behind the enhancement in the magnetic properties and shows that the Mn doping content at x = 0.05 produces the most local atomic disorder in ZnO NPs. There is a strong harmony among the XRD, XANES, EXAFS and magnetization behavior of the Mn-doped ZnO NPs. Maximum magnetization was acquired at an Mn content of 0.05. γ-Ray-irradiated Zn1–x Mn x O NPs are recommended as optimized candidates for showing the diversity of the applications.

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“…In summary, Mn incorporation into the ZnO structure was confirmed from the XANES and EXAFS fitting. These results match well with those shown by Yadav et al (2015).…”

Section: Figuresupporting

confidence: 92%

Coupling between γ-irradiation and synchrotron-radiation-based XAFS techniques for studying Mn-doped ZnO nanoparticles

Imam¹,

Harfouche²,

Azab³

et al. 2022

J Synchrotron Rad

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“…On the other hand, the superparamagnetic behavior observed in LTO:Fe-HC is associated with the high Fe concentration (above 10 at.%) found on the thin film, where the synthesis conditions promoted the generation of the magnetic behavior. It has been reported that high amounts of dopant destroy the ferromagnetic order in DMOs and other types of magnetic behavior may arise [53][54][55][56]. In our case, the LTO:Fe-HC sample presented a superparamagnetic behavior.…”

Section: Magnetic Properties Of the Lto:fe-hc And Lto:fe-lc Thin Filmssupporting

confidence: 45%

“…The appearance of ferromagnetism in DMOs has been reported for dopant concentrations of up to 10 at.% [52]. However, it has been reported in the literature that there is a maximum limit of dopant concentration (which varies for each material) above which the ferromagnetic ordering begins to decrease and even gets destroyed [53][54][55][56].…”

Section: Magnetic Properties Of the Lto:fe-hc And Lto:fe-lc Thin Filmsmentioning

confidence: 99%

Iron-Doped Lithium Tantalate Thin Films Deposited by Magnetron Sputtering: A Study of the Iron Role in the Structure and the Derived Magnetic Properties

et al. 2020

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Fe-doped LiTaO3 thin films with a low and high Fe concentration (labeled as LTO:Fe-LC and LTO:Fe-HC, respectively) were deposited by magnetron sputtering from two home-made targets. The dopant directly influenced the crystalline structure of the LiTaO3 thin films, causing the contraction of the unit cell, which was related to the incorporation of Fe3+ ions into the LiTaO3 structure, which occupied Li positions. This substitution was corroborated by Raman spectroscopy, where the bands associated with Li-O bonds broadened in the spectra of the samples. Magnetic hysteresis loops, zero-field cooling curves, and field cooling curves were obtained in a vibrating sample magnetometer. The LTO:Fe-HC sample demonstrates superparamagnetic behavior with a blocking temperature of 100 K, mainly associated with the appearance of Fe clusters in the thin film. On the other hand, a room temperature ferromagnetic behavior was found in the LTO:Fe-LC layer where saturation magnetization (3.80 kAm−1) and magnetic coercivities were not temperature-dependent. Moreover, the crystallinity and morphology of the samples were evaluated by X-ray diffraction and scanning electron microscopy, respectively.

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“…38 Oxygen vacancy mediated FM has been observed by us in several other doped TM doped ZnO samples also viz., in Fe doped and Cr doped ZnO nanocrystals and Mn doped ZnO thin lm samples. [39][40][41]…”

Section: X-ray Absorption Spectroscopymentioning

confidence: 99%

Structural investigations of (Mn, Dy) co-doped ZnO nanocrystals using X-ray absorption studies

et al. 2017

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X-ray absorption spectroscopy of Mn doped ZnO thin films prepared by rf sputtering technique

Cited by 23 publications

References 38 publications

Coupling between γ-irradiation and synchrotron-radiation-based XAFS techniques for studying Mn-doped ZnO nanoparticles

Coupling between γ-irradiation and synchrotron-radiation-based XAFS techniques for studying Mn-doped ZnO nanoparticles

Iron-Doped Lithium Tantalate Thin Films Deposited by Magnetron Sputtering: A Study of the Iron Role in the Structure and the Derived Magnetic Properties

Structural investigations of (Mn, Dy) co-doped ZnO nanocrystals using X-ray absorption studies

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