1. Supported in part by National Science Foundation grant DMR 86-19688 (Mctallurgy Program).
2. B. Lindgren, E. Karlsson, T. Butz and Bedi, University of Uppsala, Institute of Physics, Annual Report (1976), p. 27.
3. M. Blume, inHyperfine Structure and Nuclear Radiations, eds. E. Matthias and D.A. Shirley (North-Holland, Amsterdam, 1968) p. 911; see also. A.R. Chowdhury, G.S. Collins and C. Hohenemster, Phys. Rev. B33(1986)6231.
4. A.R. Arends, C. Hohenemser, F. Pleiter, H. de Waard, L. Chow and R.M. Suter, Hyperfine Interactions 3(1977)87.
5. W.B. Pearson, Lattice Spacings and Structures of Metals and Alloys (Pergamon, New York, 1958), p. 501.