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Ca 14 Si 19 – a Zintl Phase with a Novel Twodimensional Silicon Framework
Author(s) -
Currao Antonio,
Wengert Steffen,
Nesper Reinhard,
Curda Jan,
Hillebrecht H.
Publication year - 1996
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19966220319
Subject(s) - silicon , diamagnetism , semiconductor , materials science , phase (matter) , band gap , crystallography , semiconductor materials , mineralogy , chemistry , physics , metallurgy , optoelectronics , organic chemistry , quantum mechanics , magnetic field
Ca 14 Si 19 is an overlooked binary phase in the Ca/Si system with a novel type of twodimensional silicon framework (R 3 c, a = 867.85(6), c = 6852.8(8) pm, Z = 6). The basic building units are 3,3,3‐barrelanes Si 11 which are linked by Si 3 bridges to form a twodimensional silicon framework leaving space for interstitial calcium atoms. The thickness of the silicon layers is about 800 pm. The compound is a semiconductor with a band gap of about E G = 0.1 eV and a diamagnetic moment of χ mole = −9 · 10 −4 cm 3 mol −1 . According to the relatively high linking of silicon atoms the reaction with air and moisture is fairly slow.