Crystallochemical Structure of Tourmalines Inferred from Mössbauer Spectroscopy

• Authors: J. Kraczka , A. Pieczka
• Languages of publication: EN

Abstracts

EN

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

EN

76.80.+y

Discipline

• 76.80.+y: Mössbauer effect; other γ-ray spectroscopy(see also 33.45.+x Mössbauer spectra—in atomic and molecular physics; for biophysical applications, see 87.64.kx; for chemical analysis applications, see 82.80.Ej)

• Journal: Acta Physica Polonica A
• Year: 2001
• Volume: 100
• Issue: 5
• Pages: 743-750

Dates

published

2001-11

received

2001-05-14

Contributors

author

J. Kraczka

• H. Niewodniczański Institute of Nuclear Physics, Radzikowskiego 152, 31-342 Cracow, Poland

author

A. Pieczka

• University of Mining and Metallurgy, Mickiewicza 30, 30-059 Cracow, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.100.743