Synthesis and thermal behavior of Fe3O2(BO4) oxoborate
- Authors: Biryukov Y.P.1,2, Bubnova R.S.1,2, Filatov S.K.2, Goncharov A.G.2,3
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Affiliations:
- Grebenshchikov Institute of Silicate Chemistry
- Institute of Earth Sciences
- Institute of Precambrian Geology and Geochronology
- Issue: Vol 42, No 2 (2016)
- Pages: 202-206
- Section: Article
- URL: https://journals.rcsi.science/1087-6596/article/view/215427
- DOI: https://doi.org/10.1134/S1087659616020048
- ID: 215427
Cite item
Abstract
Iron oxoborate Fe3O2(BO4) has been first produced in solid-phase chemical reactions. Its thermal behavior in the temperature range 20–900°C is studied with the use in-situ high-temperature powder X-ray diffraction. It is shown that Fe3O2(BO4) begins decomposing with the formation of Fe2O3 in the temperature range 660–900°C. Thermal expansion is sharply anisotropic at room temperature (αmax/αmin = 7) and becomes more isotropic with an increase in the temperature (αmax/αmin = 1.2). The degree of oxidation of Fe3+ has been confirmed by Mössbauer spectroscopy (at a room temperature), and two nonequivalent positions in the structure have been detected, which are occupied by iron atoms with the octahedral environment of the oxygen atoms.
About the authors
Ya. P. Biryukov
Grebenshchikov Institute of Silicate Chemistry; Institute of Earth Sciences
Author for correspondence.
Email: rimma_bubnova@mail.ru
Russian Federation, nab. Makarova 2, St. Petersburg, 199034; Universitetskaya nab. 7/9, St. Petersburg, 199034
R. S. Bubnova
Grebenshchikov Institute of Silicate Chemistry; Institute of Earth Sciences
Email: rimma_bubnova@mail.ru
Russian Federation, nab. Makarova 2, St. Petersburg, 199034; Universitetskaya nab. 7/9, St. Petersburg, 199034
S. K. Filatov
Institute of Earth Sciences
Email: rimma_bubnova@mail.ru
Russian Federation, Universitetskaya nab. 7/9, St. Petersburg, 199034
A. G. Goncharov
Institute of Earth Sciences; Institute of Precambrian Geology and Geochronology
Email: rimma_bubnova@mail.ru
Russian Federation, Universitetskaya nab. 7/9, St. Petersburg, 199034; nab. Makarova 2, St. Petersburg, 199034