Ni‐doped ZnO: Studies on structural and magnetic properties

Mohapatra, Jyoshnarani; Mishra, Dilip Kumar; Kamilla, Sushanta Kumar; Medicherla, V. R. R.; Phase, D. M.; Berma, V.; Singh, Saroj Kumar

doi:10.1002/pssb.201046513

Cited by 41 publications

(16 citation statements)

References 39 publications

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“…The occurrence of extra peaks and the intensity dependence on the Al concentration signifies that these peaks are due to the presence of additional phases in wurtzite ZnO mainly related to metallic Ni and NiO-like crystalline structures. It is known that Ni is very unsTable in the ZnO matrix and has the tendency to form clusters of metallic Ni or NiO 29) . The dominant phase is, however, the wurtzite because of smaller concentrations of Ni (10%) and Al (0-2.5%) atoms in the prepared samples.…”

Section: Methodsmentioning

confidence: 99%

Structural and Optical Characterization of Ni and Al Co-Doped ZnO Nanopowders Synthesized via the Sol-Gel Process

Sayari

Mır

2015

KONA

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We have successfully synthesized (Ni,Al) co-doped ZnO nanostructured powders via the sol-gel technique at low temperature. The elemental analysis confirms the incorporation of the Ni and Al ions into the ZnO matrix. The structural study revealed that the nanopowder samples are assembled in flower-shaped Zn 0.9-x Ni 0.1 Al x O nanostructures with average crystallite sizes ranging from 39 to 53 nm. The XRD patterns show that the Zn 0.9-x Ni 0.1 Al x O nanopowders have a hexagonal wurtzite polycrystalline structure. Weak diffraction peaks related mainly to nickel oxides are also detected in the samples. The highest crystallite size, lowest lattice parameters and unit cell volume are obtained for the nanopowder samples that contain 1.5 at.% of aluminum. The decomposition process of the dried gel system is investigated by thermogravimetric analysis (TGA). Raman scattering and FT-IR measurements confirm the wurtzite structure of the synthesized Zn 0.9-x Ni 0.1 Al x O nanopowders. The energy band gap of the synthesized nanopowders (~3.32 eV) was estimated by using the Brus equation and the crystallite sizes obtained from XRD data, for comparison. The strain in the nanopowder samples (~2.7 × 10 -3 ) was also calculated according to the Stokes-Wilson equation.

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Section: Methodsmentioning

confidence: 99%

Structural and Optical Characterization of Ni and Al Co-Doped ZnO Nanopowders Synthesized via the Sol-Gel Process

Sayari

Mır

2015

KONA

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“…These spectra are considered as the internal reference spectrum shown in Fig. c and d . The presence of asymmetric behavior in two unresolved overlapping peaks of oxygen 1s spectrum indicates that oxygen exists in two chemical states in both the compounds associated with the surface and chemical bonds (indicated by arrows in both Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Majority of reports available in the literature on Zn

_{1 - x}

_{x}

O system are focused on the magnetic and electrical properties from DMS point of view . Nonetheless, reports dealing with fundamental properties of Ni containing ZnO system are scarce in the literature . Mohapatra et al.…”

Section: Introductionmentioning

confidence: 99%

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The X-ray photoelectron spectroscopy and high-temperature structural studies of Zn1−xNixO/NiO two-phase composites

Joshi

Nayak

Suresh

et al. 2015

Phys. Status Solidi B

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Detailed investigation of the chemical states and local atomic environment of Ni and Zn in the two‐phase composites of Zn1−xNixO/NiO was reported. The X‐ray photoelectron spectra of both Ni‐2p and Zn‐2p revealed the existence of a doublet with spin‐orbit splitting Δ∼ 17.9 and 23.2 eV, respectively confirming the divalent oxidation state of both Ni and Zn. However, the samples fabricated under oxygen‐rich conditions exhibit significant difference in the binding energy Δ∼ 18.75 eV between the 2p3/2 and 2p1/2 states of Ni. The shift in the satellite peaks of Ni‐2p with increasing the Ni composition x within the Zn1−xNixO/NiO matrix signifies the attenuation of nonlocal screening because of reduced site occupancy of two adjacent Zn ions. The temperature dependence of X‐ray diffraction analysis reveals a large distortion in the axial‐rhombohedral angle α′ for oxygen‐rich NiO. Conversely, no significant distortion was noticed in the NiO system present as a secondary phase within Zn1−xNixO. Nevertheless, the unit‐cell volume of both wurtzite h.c.p. Zn1−xNixO and f.c.c. NiO exhibits an anomalous behavior between 150 and 300° C. The origin of such unusual change in the unit‐cell volume was discussed in terms of oxygen stoichiometry.

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“…As the Ni content increases beyond the limit of the solid solubility of Ni in ZnO, part of Ni ions does not enter in the crystalline structure of ZnO and thus crystallizes alone forming nano NiO grains as indicated by the XRD patterns. Such a structural degradation in the ZnO lattice may be attributed to the introduction of a foreign impurity with subsequent annealing [30]. As seen in Fig.…”

Section: Methodsmentioning

confidence: 96%

Annealing and Ni content effects on EPR and structural properties of Zn_1–xNi_xO aerogel nanoparticles

Sayari

Mır

2017

Materials Science-Poland

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Zn 1−x Ni x O aerogel nanopowders with nickel concentration in the range of 0.05 x 0.25, were synthesized by the sol-gel processing technique and post-annealed in air at 500°C. Structural, vibrational, thermal and magnetic properties of the as-prepared and annealed Zn 1−x Ni x O powdered samples were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman scattering, thermal gravimetric analysis (TGA) and electron paramagnetic resonance (EPR) spectroscopy. In addition to the ZnNiO phase, XRD analysis revealed the formation of a secondary NiO phase when the Ni content was greater than or equal to 10 %. The TEM images confirm that the particle size is in the range of 20 nm to 40 nm, in accordance with XRD results, and the particles are well dispersed. Raman scattering measurements confirm the wurtzite structure of the synthesized Zn 1−x Ni x O nanopowders and show that intrinsic host-lattice defects are activated when Ni 2+ ions are substituted to the Zn sites. Room temperature ferromagnetic order was observed in all of the samples and was strongly dependent on the Ni content and thermal annealing. These results indicate that the observed room temperature ferromagnetism in ZnNiO may be attributed to the substitutional incorporation of Ni at Zn sites.

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Ni‐doped ZnO: Studies on structural and magnetic properties

Cited by 41 publications

References 39 publications

Structural and Optical Characterization of Ni and Al Co-Doped ZnO Nanopowders Synthesized via the Sol-Gel Process

Structural and Optical Characterization of Ni and Al Co-Doped ZnO Nanopowders Synthesized via the Sol-Gel Process

The X-ray photoelectron spectroscopy and high-temperature structural studies of Zn1−xNixO/NiO two-phase composites

Annealing and Ni content effects on EPR and structural properties of Zn_1–xNi_xO aerogel nanoparticles

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Ni‐doped ZnO: Studies on structural and magnetic properties

Cited by 41 publications

References 39 publications

Structural and Optical Characterization of Ni and Al Co-Doped ZnO Nanopowders Synthesized via the Sol-Gel Process

Structural and Optical Characterization of Ni and Al Co-Doped ZnO Nanopowders Synthesized via the Sol-Gel Process

The X-ray photoelectron spectroscopy and high-temperature structural studies of Zn1−xNixO/NiO two-phase composites

Annealing and Ni content effects on EPR and structural properties of Zn1–xNixO aerogel nanoparticles

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Annealing and Ni content effects on EPR and structural properties of Zn_1–xNi_xO aerogel nanoparticles