Multifunctional nanocrystalline chromium boride thin films

Jha, Menaka ; Marka, Sandeep ; Krishna, M. Ghanashyam ; Ganguli, A. K. (2012) Multifunctional nanocrystalline chromium boride thin films Materials Letters, 73 . pp. 220-222. ISSN 0167-577X

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The present study highlights the growth and properties of chromium diboride films (100–300 nm thickness) deposited on to various substrates (Cu, borosilicate glass and fused silica) by thermal evaporation process. X-ray diffraction patterns showed that films were slightly boron deficient. This was confirmed using EDX measurements which indicated a nominal composition of CrB1.5. However, electron diffraction patterns showed the presence of CrB2 leading to the inference that the films were composites of CrB2 and CrB1.5. The films were nanocrystalline with crystallite sizes of the order of 15–20 nm. Scanning electron micrographs revealed that the film morphology is substrate dependent. The films on borosilicate glass and fused silica were optically transparent and insulating at thickness of ~100 nm. The thicker films were opaque and conducting. There was enhancement in reflectance of Cu substrates from 25 to 50% in the near IR wavelength region due to the chromium boride coatings. The hardness of the films was 10 GPa on Cu while it was 8 GPa on glass substrates.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Chromium Diboride; Nanocrystalline Materials; Optical Properties; Mechanical Properties
ID Code:111991
Deposited On:28 Sep 2017 12:28
Last Modified:28 Sep 2017 12:28

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