http://hdl.handle.net/20.500.12128/15308
Tytuł: | Molecular Hydrogen in Natural Mayenite |
Autor: | Galuskin, Evgeny Galuskina, Irina Vapnik, Yevgeny Murashko, Mikhail |
Słowa kluczowe: | mayenite; fluorkyuygenite; Raman spectroscopy; molecular hydrogen; H2; pyrometamorphic rocks; barringerite; shreibersite; Hatrurim Complex; Negev Desert; Israel |
Data wydania: | 2020 |
Źródło: | Minerals, Vol. 10 (2020), Art. No. 560 |
Abstrakt: | In the last 15 years, zeolite-like mayenite, Ca12Al14O33, has attracted significant attention in material science for its variety of potential applications and for its simple composition. Hydrogen plays a key role in processes of electride material synthesis from pristine mayenite: {Ca12Al14O32}2+(O2)!{Ca12Al14O32}2+(e)2. Apresence of molecular hydrogen in synthetic mayenite was not confirmed by the direct methods. Spectroscopy investigations of mayenite group mineral fluorkyuygenite, with empirical formula (Ca12.09Na0.03)P 12.12(Al13.67Si0.12Fe3+ 0.07Ti4+ 0.01)P 12.87O31.96 [F2.02Cl0.02(H2O)3.22(H2S)0.15 0.59]P 6.00, show the presence of an unusual band at 4038 cm1, registered for the first time and related to molecular hydrogen, apart from usual bands responding to vibrations of mayenite framework. The band at 4038 cm1 corresponding to stretching vibrations of H2 is at lower frequencies in comparison with positions of analogous bands of gaseous H2 (4156 cm1) and H2 adsorbed at active cation sites of zeolites (4050–4100 cm1). This points out relatively strong linking of molecular hydrogen with the fluorkyuygenite framework. An appearance ofH2 in the fluorkyuyginite with ideal formula Ca12Al14O32[(H2O)4F2], which formed after fluormayenite, Ca12Al14O32[ 4F2], is connected with its genesis. Fluorkyuygenite was detected in gehlenite fragments within brecciaed pyrometamorphic rock (Hatrurim Basin, Negev Desert, Israel), which contains reduced mineral assemblage of the Fe-P-C system (native iron, schreibersite, barringerite, murashkoite, and cohenite). The origin of phosphide-bearing associations is connected with the e ect of highly reduced gases on earlier formed pyrometamorphic rocks. |
URI: | http://hdl.handle.net/20.500.12128/15308 |
DOI: | 10.3390/min10060560 |
ISSN: | 2075-163X |
Pojawia się w kolekcji: | Artykuły (WNP) |
Plik | Opis | Rozmiar | Format | |
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Galuskin_Molecular_hydrogen_in_natural_Mayenite.pdf | 1,62 MB | Adobe PDF | Przejrzyj / Otwórz |
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