VC0.88. Room temperature.
1) J. Pflüger, J. Fink. Determination of optical constants by high-energy, electron-energy-loss spectroscopy (EELS), in Handbook of optical constants of solids II, Edward D. Palik, ed. Academic Press, 1991. pp. 293-310
2) J. Pflüger, J. Fink, W. Weber, K. P. Bohnen, G. Crecelius. Dielectric properties of TiCx, TiNx, VCx, and VNx from 1.5 to 40 eV determined by electron-energy-loss spectroscopy, Phys. Rev. B 30, 1155-1163 (1984)