Na 3 MgB 37 Si 9 : an icosa-hedral B 12 cluster framework containing {Si 8 } units.

Autor: Morito H; Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan., Ikeda T; Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology, 4-2-1, Nigatake, Miyagino-ku, Sendai 983-8551, Japan., Katsura Y; National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan., Yamane H; Institute of Multidisciplinary Research for Advanced Materials, Tohoku, University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.
Jazyk: angličtina
Zdroj: Acta crystallographica. Section E, Crystallographic communications [Acta Crystallogr E Crystallogr Commun] 2022 Jan 18; Vol. 78 (Pt 2), pp. 203-206. Date of Electronic Publication: 2022 Jan 18 (Print Publication: 2022).
DOI: 10.1107/S2056989022000494
Abstrakt: Single crystals of a novel sodium-magnesium boride silicide, Na 3 MgB 37 Si 9 [ a = 10.1630 (3) Å, c = 16.5742 (6) Å, space group R m (No. 166)], were synthesized by heating a mixture of Na, Si and crystalline B with B 2 O 3 flux in Mg vapor at 1373 K. The Mg atoms in the title compound are located at an inter-stitial site of the Dy 2.1 B 37 Si 9 -type structure with an occupancy of 0.5. The (001) layers of B 12 icosa-hedra stack along the c -axis direction with shifting in the [- a /3, b /3, c /3] direction. A three-dimensional framework structure of the layers is formed via B-Si bonds and {Si 8 } units of [Si] 3 -Si-Si-[Si] 3 .
(© Morito et al. 2022.)
Databáze: MEDLINE
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