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Structural and optical characterization of MgO: X (X=Li, Na, and K) by solution combustion technique

Sivasankari, J. ; Selvakumar, S. ; Sivaji, K. ; Sankar, S.

Journal of alloys and compounds, 2014-12, Vol.616, p.51-57 [Periódico revisado por pares]

Kidlington: Elsevier B.V

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Título:
Structural and optical characterization of MgO: X (X=Li, Na, and K) by solution combustion technique
Autor: Sivasankari, J. ; Selvakumar, S. ; Sivaji, K. ; Sankar, S.
Assuntos: Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures ; Electronic structure of nanoscale materials : clusters, nanoparticles, nanotubes, and nanocrystals ; Exact sciences and technology ; Insulators ; Nanocrystals and nanoparticles ; Optical properties ; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation ; Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures ; Physics ; SEM ; TEM ; X-ray diffraction
É parte de: Journal of alloys and compounds, 2014-12, Vol.616, p.51-57
Descrição: •Alkali metal ions doped MgO nanopowders were synthesized by solution-combustion method.•Crystal structure and crystallite size were characterized by XRD.•Electron microscope (SEM and TEM) were used to determine the morphology and size of the particles.•Transition of semi-insulator to semiconductor was observed for alkali metals doped MgO at 800°C. Pure MgO and Li, Na and K doped MgO nanocrystallites were synthesized by solution combustion method. XRD analysis reveals that all the MgO doped nanocrystals exhibited cubic structure. Scanning electron microscopy (SEM) studies revealed the spherical crystal structure for MgO:Na with small porous spherical structure for MgO:K. The UV–VIS showed that band gap is blue shifted for as-prepared samples and red shifted for the annealed samples. The result suggests that MgO nanocrystallites were transformed from semi-insulator to semiconductor while doped with alkali metals. FT-IR shows the band at 472cm−1, associated with the characteristic vibrational mode of symmetric MgO6 octahedral of MgO. FT-Raman spectra show the peaks below 1500cm−1 associated to D-bands and peak at 1918cm−1 represents the G-band.
Editor: Kidlington: Elsevier B.V
Idioma: Inglês

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Structural and optical characterization of MgO: X (X=Li, Na, and K) by solution combustion technique

Sivasankari, J. ; Selvakumar, S. ; Sivaji, K. ; Sankar, S.

Kidlington: Elsevier B.V

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