Abstract：
:Agrellite, NaCa2Si4O10F, is a tubular silicate mineral which crystal structure is characterized by extended [Si8O20]8- tubes and has a two-dimensional channel system. The mineral is a representative of a complex silicate family which contains some structural voids but cannot be considered as microporous because of small channel widths. However, the channel system of such minerals is able to host single guest atoms, molecules or radicals which can affect their physical properties. Presently, the exact mechanism of such hosting is undetermined. However, such information could be quite useful for materials' application as zeolites as well as for a better understanding of their formation mechanisms. In this work we couple X-ray diffraction, infrared (IR) spectroscopy and ab initio calculations to identify structural features in agrellite from Malyy Murun massif (Russia) caused by incorporation of either H2O or OH- into the channel system. We construct structural models of water-containing NaCa2Si4O10F and identified H2O positions. The derivation of H2O sites is based on simulation of IR-spectra. Infrared spectroscopy in combination with the ab initio calculation has proven to be an effective tool for the identification of the structural positions of hydroxyl anions (OH-) and neutral water groups (H2O) in minerals.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Kaneva E,Bogdanov A,Shendrik Rdoi
10.1038/s41598-020-72631-1subject
Has Abstractpub_date
2020-09-23 00:00:00pages
15569issue
1issn
2045-2322pii
10.1038/s41598-020-72631-1journal_volume
10pub_type
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