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Phonon and magnon excitations in NiO and Ni/NiO hybrid nanostructures: a comparative Raman scattering study.

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Title: Phonon and magnon excitations in NiO and Ni/NiO hybrid nanostructures: a comparative Raman scattering study.
Authors: Jayalakshmi, G1 (AUTHOR) jayasrnmc@gmail.com, Saravanan, K2 (AUTHOR)
Source: Bulletin of Materials Science. Mar2026, Vol. 49 Issue 1, p1-8. 8p.
Subjects: Raman scattering, Spin excitations, Hydrothermal synthesis, X-ray diffraction, Transmission electron microscopy, Lattice dynamics, Nanostructures, Nickel oxides
Abstract: In the present study, we extensively studied the phonon and magnon excitations in nickel oxide (NiO) and Ni/NiO hybrid nanostructures using Raman scattering analyses. The NiO nanostructures were synthesized by facile hydrothermal route and annealed under air and argon (Ar) atmosphere at 800°C. Interestingly, Ar annealed NiO nanostructure shows fine sized particles and the formation of Ni/NiO hybrid. The morphological, structural and phonon vibrational modes of the synthesized nanostructures were investigated by transmission electron microscopy (TEM), grazing incident X-ray diffraction (GIXRD), and Raman scattering techniques. The TEM and GIXRD measurements confirm the formation of face centered cubic phase in NiO and Ni/NiO nanostructures. The surface optical phonon mode is observed in both NiO and Ni/NiO hybrid nanostructure and its theoretical peak positions are estimated using dielectric continuum model. Magnon modes do not appear in Ni/NiO nanostructure, which could be correlated to the reduction in the spin correlated length and super exchange interactions due to the symmetry breaking in the next nearest neighbor of Ni2+ ions in the linear atomic chain, Ni2+–O2−–Ni2+ of the crystal lattice. [ABSTRACT FROM AUTHOR]
Copyright of Bulletin of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Phonon and magnon excitations in NiO and Ni/NiO hybrid nanostructures: a comparative Raman scattering study.
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  Data: <searchLink fieldCode="AR" term="%22Jayalakshmi%2C+G%22">Jayalakshmi, G</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jayasrnmc@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Saravanan%2C+K%22">Saravanan, K</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Bulletin+of+Materials+Science%22">Bulletin of Materials Science</searchLink>. Mar2026, Vol. 49 Issue 1, p1-8. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Raman+scattering%22">Raman scattering</searchLink><br /><searchLink fieldCode="DE" term="%22Spin+excitations%22">Spin excitations</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrothermal+synthesis%22">Hydrothermal synthesis</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+diffraction%22">X-ray diffraction</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+electron+microscopy%22">Transmission electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Lattice+dynamics%22">Lattice dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Nanostructures%22">Nanostructures</searchLink><br /><searchLink fieldCode="DE" term="%22Nickel+oxides%22">Nickel oxides</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In the present study, we extensively studied the phonon and magnon excitations in nickel oxide (NiO) and Ni/NiO hybrid nanostructures using Raman scattering analyses. The NiO nanostructures were synthesized by facile hydrothermal route and annealed under air and argon (Ar) atmosphere at 800°C. Interestingly, Ar annealed NiO nanostructure shows fine sized particles and the formation of Ni/NiO hybrid. The morphological, structural and phonon vibrational modes of the synthesized nanostructures were investigated by transmission electron microscopy (TEM), grazing incident X-ray diffraction (GIXRD), and Raman scattering techniques. The TEM and GIXRD measurements confirm the formation of face centered cubic phase in NiO and Ni/NiO nanostructures. The surface optical phonon mode is observed in both NiO and Ni/NiO hybrid nanostructure and its theoretical peak positions are estimated using dielectric continuum model. Magnon modes do not appear in Ni/NiO nanostructure, which could be correlated to the reduction in the spin correlated length and super exchange interactions due to the symmetry breaking in the next nearest neighbor of Ni2+ ions in the linear atomic chain, Ni2+–O2−–Ni2+ of the crystal lattice. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Bulletin of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s12034-025-03539-7
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      – Code: eng
        Text: English
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      – SubjectFull: Raman scattering
        Type: general
      – SubjectFull: Spin excitations
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      – SubjectFull: Hydrothermal synthesis
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      – SubjectFull: X-ray diffraction
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      – SubjectFull: Transmission electron microscopy
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      – SubjectFull: Lattice dynamics
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      – SubjectFull: Nanostructures
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      – SubjectFull: Nickel oxides
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      – TitleFull: Phonon and magnon excitations in NiO and Ni/NiO hybrid nanostructures: a comparative Raman scattering study.
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              Text: Mar2026
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