Electron Spin Resonance of Boron in Single—Crystal BeO

摘要: Single crystals of synthetic BeO which have been irradiated with 6‐MeV electrons show an ESR spectrum at room temperature identified as being due to boron ions substituting for beryllium normal lattice sites. The hyperfine tensor A is cylindrically symmetric its principal axis pointing towards one the near oxygen bonds. Six equivalent directions are observed corresponding positions nonaxial nearest‐neighbor atoms. constants spin Hamiltonian are: g∥ = 2.0035±0.0005, g⊥ 2.0044±0.0005, A∥ 122 Oe, A⊥ 76.5 Oe. analyzed in terms paramagnetic electron occupying antibonding orbital located along direction a B–O bond. Comparison interaction those expected free atom suggests deviations from tetrahedral sp3 configuration ratio p s contribution increases √3 2.64, implying that bond lengthened paramagnet...