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European Journal of Mineralogy; July, August 2003; v. 15; no. 4; p. 707-710; DOI: 10.1127/0935-1221/2003/0015-0707
© 2003 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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Articles

Quadrupole splitting distributions in triclinic astrophyllite

Zhe LI1, Zhesheng MA2, Ming XIONG2, Nicheng SHI2, Danian YE1 and Alexandr KHOMYAKOV3

1 Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China
2 China Geoscience University, Beijing 100083, China
3 Department of Geology, Moscow State University, Moscow, Russia

The mineral, triclinic astrophyllite, was investigated using the Mössbauer effect. The Mössbauer spectra of triclinic astrophyllite at 298 K, 180 K and 90 K were measured, and the quadrupole splitting distributions (QSDs) from the Mössbauer spectra were obtained by using a Voigt-based method for line shape analysis. The distortion parameters, the variances of the octahedral bond angles for triclinic astrophyllite, were calculated, and a site assignment was tentatively given based on the distortion parameters. According to the ratios of ferric to total iron obtained by the Mössbauer effect and the mean value of f(Fe3+(O))/f(Fe2+(O)), the chemical formula of triclinic astrophyllite was rewritten.

Key-words: Mössbauer effect, quadrupole splitting distributions, astrophyllite..




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P. C. PIILONEN, D. G. RANCOURT, R. J. EVANS, A. E. LALONDE, A. M. McDONALD, and A. A.T. SHABANI
The relationships between crystal-chemical and hyperfine parameters in members of the astrophyllite-group: A combined 57Fe Mossbauer spectroscopy and single-crystal X-ray diffraction study
European Journal of Mineralogy, December 1, 2004; 16(6): 989 - 1002.
[Abstract] [Full Text] [PDF]


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