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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on NaAlSi by Materials Project

NaAlSi is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Na1+ is bonded in a 5-coordinate geometry to five equivalent Si4- atoms. There are one shorter (3.13 Å) and four longer (3.14 Å) Na–Si bond lengths. Al3+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing AlSi4 tetrahedra. All Al–Si bond lengths are 2.57 Å. Si4- is bonded in a 9-coordinate geometry to five equivalent Na1+ and four equivalent Al3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaAlSi4 by Materials Project

NaAlSi4 crystallizes in the tetragonal P4mm space group. The structure is three-dimensional. Na is bonded in a 1-coordinate geometry to nine Si atoms. There are a spread of Na–Si bond distances ranging from 2.70–3.09 Å. Al is bonded in a distorted single-bond geometry to five Si atoms. There are one shorter (2.66 Å) and four longer (3.02 Å) Al–Si bond lengths. There are three inequivalent Si sites. In the first Si site, Si is bonded in a 8-coordinate geometry to two equivalent Na, two equivalent Al, and four Si atoms. There are two shorter (2.48 Å) and two longer (2.52 Å) Si–Si bond lengths. In the second Si site, Si is bonded in a distorted single-bond geometry to one Na and four equivalent Si atoms. In the third Si site, Si is bonded in a 9-coordinate geometry to four equivalent Na, one Al, and four equivalent Si atoms.

36 MATERIALS SCIENCE↗