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Elastic constants, Poisson ratios, and the elastic anisotropy of VN(001), (011), and (111) epitaxial layers grown by reactive magnetron sputter deposition
University of Illinois, IL 61801 USA University of Illinois, IL 61801 USA .
University of Illinois, IL 61801 USA University of Illinois, IL 61801 USA .
University of Illinois, IL 61801 USA University of Illinois, IL 61801 USA .
University of Illinois, IL 61801 USA University of Illinois, IL 61801 USA .
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2014 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 115, no 21, 214908- p.Article in journal (Refereed) Published
Abstract [en]

Elastic constants are determined for single-crystal stoichiometric NaCl-structure VN(001), VN(011), and VN(111) epitaxial layers grown by magnetically unbalanced reactive magnetron sputter deposition on 001-, 011-, and 111-oriented MgO substrates at 430 degrees C. The relaxed lattice parameter a(o) = 0.4134 +/- 0.0004 nm, obtained from high-resolution reciprocal space maps, and the mass density rho = 6.1 g/cm(3), determined from the combination of Rutherford backscattering spectroscopy and film thickness measurements, of the VN layers are both in good agreement with reported values for bulk crystals. Sub-picosecond ultrasonic optical pump/probe techniques are used to generate and detect VN longitudinal sound waves with measured velocities v(001) = 9.8 +/- 0.3, v(011) = 9.1 +/- 0.3, and v(111) = 9.1 +/- 0.3 km/s. The VN c(11) elastic constant is determined from the sound wave velocity measurements as 585 +/- 30 GPa; the c(44) elastic constant, 126 +/- 3 GPa, is obtained from surface acoustic wave measurements. From the combination of c(11), c(44), v(hkl), and rho we obtain the VN c(12) elastic constant 178 +/- 33 GPa, the VN elastic anisotropy A = 0.62, the isotropic Poisson ratio nu = 0.29, and the anisotropic Poisson ratios nu(001) = 0.23, nu(011) = 0.30, and nu(111) = 0.29.

Place, publisher, year, edition, pages
American Institute of Physics (AIP) , 2014. Vol. 115, no 21, 214908- p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-108927DOI: 10.1063/1.4881817ISI: 000337161600076OAI: diva2:734202
Available from: 2014-07-15 Created: 2014-07-13 Last updated: 2016-08-31

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Birch, JensHultman, LarsGreene, Joseph EPetrov, Ivan
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