For the interpretation of the electron paramagnetic resonance spectra of doped boron it is desirable to know the structure of boron. Based on the structure of fl-rhombohedral boron proposed in 1963-65 by Hoard and co-workers, the atomic coordinates were refined by means of intensity measurements of a boron single crystal. An R1 factor of 10.6% was obtained.
EinleittmgMit Kohlenstoff dotiertes fl-rhomboedrisches Bor ist 1Gcherleitend und besitzt eine paramagnetische Elek-
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