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Microstructure and optical characterization of mechanosynthesized nanostructured TiSi$_x$N$_{(1−x)}$ cermets
UJJWAL KUMAR BHASKAR S K PRADHAN
Volume 43 Published: 3 January 2020 Article ID 0034
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Fulltext
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https://www.ias.ac.in/article/fulltext/boms/043/0034 -
Keywords
Nanostructures ;Rietveld ;microstructure ;phase transitions ;bandgap energy. -
Abstract
Nanocrystalline cubic titanium silicon nitrides (TiSi$_x$N$_{(1−x)}$) with different Si concentrations have been synthesized at room temperature by mechanical alloying the stoichiometric compositions of ingredient powders in a nitrogenatmosphere. Structure and microstructure characterizations of unmilled and all ball-milled powders are carried out byanalysing respective X-ray diffraction patterns employing the Rietveld structure and microstructure refinement method.The presence of titanium, silicon and nitrogen in TiSi$_x$N$_{(1−x)}$ has been confirmed by energy-dispersive X-ray transmission electron microscopy analysis. Transmission electron microscopy image reveals that the average size of the spherical particles of 9-h-milled powder is $\sim$5 nm and size distribution is almost monodispersed, which corroborates well with the result of the Rietveld analysis. Bandgap energies of these solid solutions are determined by analysing respective UV–Vis absorption spectrum and it is found that the addition of silicon to insulating nanocrystalline TiN results in a reduction of bandgap energy and all solid solutions become wide-bandgap semiconductors with the addition of Si in different proportions.
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Author Affiliations
UJJWAL KUMAR BHASKAR1 S K PRADHAN2
- Department of Physics, Sreegopal Banerjee College, Bagati, Magra, Hooghly 712148, India
- Department of Physics, The University of Burdwan, Golapbag, Burdwan 713104, India
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Dates
- Published
- 3 January 2020
- Manuscript received
- 7 May 2019
- Accepted
- 30 August 2019
- Final version published online
- 18 December 2019
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Bulletin of Materials Science
Volume 46, 2023
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