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Abstracts
In the Y octahedra of tourmalines theoretically may occur ions of Fe^{2+} and Fe^{3+}. The authors discuss Mössbauer measurements and confirm the ordered model of ionic distribution at these sites: the presence of Fe^{3+} ions in the Y octahedra and Al^{3+} ions in the Z octahedra. The spectra of different tourmalines annealed at temperatures ranging from 873 K to 1153 K show that Fe^{3+} ions can occur in both of these sites. The annealing has changed the symmetry of the neighbourhood of iron ions at the octahedral sites. It has been shown that the doublets with QS<2.00 mm/s should not been attributed to Fe^{2+}(Z). Also new results corroborating the existence of the iron ions in the mixed valence state in tourmalines have been presented.
Keywords
Journal
Year
Volume
Issue
Pages
743-750
Physical description
Dates
published
2001-11
received
2001-05-14
Contributors
author
- H. Niewodniczański Institute of Nuclear Physics, Radzikowskiego 152, 31-342 Cracow, Poland
author
- University of Mining and Metallurgy, Mickiewicza 30, 30-059 Cracow, Poland
References
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- 7. A. Pieczka, J. Kraczka, W. Zabiński, J. Czech. Geol. Soc., 43, 1-2, 69, 1998
- 8. J. Kraczka, A. Pieczka, Mol. Phys. Rep., 30, 80, 2000
- 9. A. Pieczka, Eur. J. Min., 12, 589, 2000
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv100n504kz