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57Mn was produced by projectile fragmentation of an 58Fe beam on a Be target using the Heavy Ion Medical Accelerator (HIMAC) of NIRS. 57Mn nuclei (~106 pps) were implanted into a sin-gle-crystalline α-Al2O3 after passing through energy degraders. A thin plastic scintillation counter was set between PPAC and the α-Al2O3 sample to reject the β-rays that induced high background.
The 57Mn implantation Mössbauer spectra were measured at room temperature (Fig. 1), 193 K, and 92 K. The obtained spectra could be analyzed by three components of doublets from the calculations of ORCA program. It was concluded that D1 (δ =0.43 mm/s, ΔEQ=0.22 mm/s), D2 (δ =0.70 mm/s, ΔEQ =1.31 mm/s), and D3 (δ =0.68 mm/s, ΔEQ =2.43 mm/s) at R.T. were assigned to be substitu-tional Fe atoms on Al sites, interstitial Fe atoms with octahedral symmetry of oxygen, and substitu-tional Fe atoms with an oxygen deficiency. The temperature dependence of these components will be discussed.
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