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An improved model for the interpretation of Mossbauer spectra of dioctahedral 2:1 trans-vacant Fe-rich micas: refinement of parametersстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Dainyak Lidia G., Rusakov Viacheslav S., Sukhorukov Ivan A., Zviagina Bella B., Drits Victu A.
- Журнал: European Journal of Mineralogy
- Том: 21
- Номер: 5
- Год издания: 2009
- Издательство: E. Schweizerbart'sche Verlagsbuchhandlung
- Местоположение издательства: Germany
- Первая страница: 995
- Последняя страница: 1008
- DOI: 10.1127/0935-1221/2009/0021-1954
- Аннотация: Two Upper Riphean glauconite samples of the Southern Urals with unusually low Fe(3+)/Fe(2+) ratios were Studied by (57)Fe Mossbauer and IR spectroscopy. Room and liquid-nitrogen temperature Mossbauer spectra were analyzed with quasi-continuous model-independent quadrupole splitting distributions (QSDs). The obtained QSDs were interpreted using a crystal-chemical taking account of the effects of the local structural and chemical heterogeneity of layer silicates. The main parameters of the chemical model are individual quadrupole splittings, Delta(pred)(i) and Delta(tent)(i), for Fe(3+) and Fe(2+), respectively, in different local arrangements (LCAs) with their Occurrence probabilities, w(i), provided by two-dimensional simulation of the cation distribution Using the parameters of the crystal-chemical model, QSD(sim) profiles were simulated and compared with the experimental QSDs. To obtain agreement between QSD(exp) and QSD(sim) profile, w(i) and Delta(i) values were adjusted using the method of successive approximations. As a result, the tentative Delta(tent)(i) values for Fe contributions to Mossbauer spectra were refined. The sequence of refined Delta(ref)(i) values corresponding to specific LCA types remained the same as that for the Delta(tent)(i) values. For the studied glauconites, the reconstructions satisfying the experimental QSDs are characterized by similar local distribution of cations around Fe(3+) and different local cation distribution around Fe(2+).
- Добавил в систему: Русаков Вячеслав Серафимович