1. Mössbauer effect at 119Sn4+ nuclei in fine crystalline MnO
- Author
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C. Payen, V. E. Tkachenko, Michel Danot, M. V. Korolenko, and P. B. Fabrichnyi
- Subjects
Mössbauer effect ,Dopant ,Chemistry ,Precipitation (chemistry) ,Materials Science (miscellaneous) ,chemistry.chemical_element ,02 engineering and technology ,Manganese ,021001 nanoscience & nanotechnology ,01 natural sciences ,Ion ,Inorganic Chemistry ,Crystallography ,0103 physical sciences ,Crystallite ,Physical and Theoretical Chemistry ,010306 general physics ,0210 nano-technology ,Tin ,Hyperfine structure - Abstract
The hyperfine structure of the low-temperature Mossbauer spectra of dopant 119Sn4+ ions (0.4 at. %) in a fine crystalline MnO sample, characterized by X-ray diffraction and magnetic measurements, has been studied. The 119Sn spectra show that tin is distributed over positions with an inhomogeneous cationic environment. The appearance of such positions is explained by the local compensation for the excess charge of Sn4+ by manganese vacancies V Mn and segregation of defects resulting in precipitation of MnSnO3 clusters. The non-uniform distribution of Sn4+ and the related dependence of the number of broken magnetic bonds on the local tin concentration are responsible for the fluctuation of the T N values, which is “perceived” by 119Sn in different MnO crystallites. The 119Sn spectra exclude the possibility that tin enters into the composition of superpara-magnetic particles.
- Published
- 2007
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