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. |
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| 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] |
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| Database: | Engineering Source |
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| 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] |
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| ISSN: | 02504707 |
| DOI: | 10.1007/s12034-025-03539-7 |
