Electronic structures of the tungsten borides WB, W2B and W2B5

The electronic structures of the tungsten borides WB, W2B and W2B5 were stu died experimentally and theoretically. Using monochromatic synchrotron radi ation as the excitation source, soft X-ray emission and absorption spectros copic techniques were employed to probe the occupied and unoccupied states of the valence band, respectively. The linear muffin-tin orbital method was used to calculate the ground state electronic properties of these compound s. The experimental spectroscopic data and the calculated angular momentum- and site-projected densities of states yielded new useful information rega rding bonding and hybridization in these materials. (C) 2000 Elsevier Scien ce B.V. All rights reserved.