Stability of the Fe3 + state in ZnO
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- Naidoo, D., Gunnlaugsson, H.P., Mølholt, T.E. et al. Hyperfine Interact (2013) 221: 45. doi:10.1007/s10751-012-0730-4
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We have applied implantation of radioactive 57Mn + (T1/2 = 1.5 min) at the ISOLDE facility at CERN with 50–60 keV energy to fluences <1012 /cm2 to study the emission Mössbauer spectra from the 14.4 keV transition of the 57Fe daughter atoms. For fluences ≥5 × 101157Mn/cm2, the spectra are dominated by the Fe3 + state exhibiting a slow paramagnetic relaxation. We show that the Fe3 + state in ZnO saturated by <101257Mn/cm2 implantations is unstable. The crystals can be reset by annealing at T > 760 K or storage at room temperature for 12 months, after which they show dominantly the Fe2 + state for <2 × 101057Mn/cm2 implantations. These findings are discussed in terms of diffusion and/or annihilation of implantation-induced defects.