Electron-nuclear double resonance of VOD defects in SrO
Por:
Boldu O. J.L., Stapleton H.J., Chen Y., Abraham M.M.
Publicada:
1 ene 1977
Resumen:
Single crystals of SrO doped with deuterium were grown by the submerged-arc fusion technique. The VOD center was produced by ? irradiation at 77 K and its identity confirmed by EPR and electron-nuclear double-resonance measurements. The defect possesses 100 axial symmetry and can be described with the spin-Hamiltonian parameters: g=2.0013(2), g=2.0751(2), A=+0.396(2)MHz, A=-0.195(2)MHz, and P=+0.158(1) MHz. Absolute signs are based on the assumption that the reported positive deuterium nuclear moment requires the anisotropic portion of the hyperfine interaction to be positive. From the hyperfine parameters, a value of 5.078 for the OD - (Sr vacancy)-O- distance in this linear defect can be computed. Since the normal oxygen spacing in SrO is 5.16 , this implies an inward relaxation of the oxygens that is contrary to the previously observed cases of VOH and VOD defects in the alkaline-earth oxides where outward distortions occur. © 1977 The American Physical Society.
Filiaciones:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States
Instituto de Fisica, U.N.A.M., Mexico
University of Illinois, Urbana, IL, United States
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