| Autor: |
Parmar, S. G., Kumar, Ravi, Kulkarni, R. G. |
| Předmět: |
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| Zdroj: |
Hyperfine Interactions; 2005, Vol. 160 Issue 1-4, p235-239, 5p, 1 Chart, 1 Graph |
| Abstrakt: |
Spinel oxide Cr0.5 Li0.5 Fe2O4 has been irradiated at Nuclear Science Centre, New Delhi, by 50 MeV lithium ions of fluence 5*1013 ions/cm2 and irradiation effect on hyperfine interactions has been investigated by Mossbauer spectroscopy. The Mossbauer spectrum of irradiated sample shows no paramagnetic doublet contribution and the hyperfine fields corresponding to the Fe3+ in the octahedral (B) and the tetrahedral (A) sites are very well separated. That is the observed superimposed A and B sites in unirradiated sample are split into separate lines after Li irradiation. Further an increase of the intensity of the lines (2)–(5) with respect to (1)–(6) signals an orientation of the hyperfine magnetic field towards a direction perpendicular to the ion path due to the irradiation induced strain by the latent tracks. The computer simulation of Mossbauer spectra indicated that the irradiated Fe3+-site occupancy of the A-site hyperfine field increased from 43% to 55% whereas the B-site hyperfine field decreased from 57% to 45% compared to unirradiated sample. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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