In:
Acta Crystallographica Section E Structure Reports Online, International Union of Crystallography (IUCr), Vol. 70, No. 7 ( 2014-07-01), p. i34-i35
Kurzfassung:
Single crystals of dithulium disilicate, Tm 2 Si 2 O 7 , were obtained in flux synthesis experiments in the system SiO 2 –Tm 2 O 3 –LiF at ambient pressure. The compound belongs to the group of sorosilicates, i.e. it is based on [Si 2 O 7 ]-units and crystallizes in the thortveitite (Sc 2 Si 2 O 7 ) structure type. The Tm 3+ cation (site symmetry .2.) occupies a distorted octahedral site, with Tm—O bond lengths in the range 2.217 (4)–2.289 (4) Å. Each of the octahedra shares three of its edges with adjacent [TmO 6 ] groups, resulting in the formation of layers parallel to (001). The individual [SiO 4 ] tetrahedra are more regular, i.e. the differences between the bond lengths between Si and the bridging and non-bridging O atoms are not very pronounced. The layers containing the octahedra and the sheets containing the [Si 2 O 7 ] groups (point group symmetry 2/ m ) form an alternating sequence. Linkage is provided by sharing common oxygen vertices.
Materialart:
Online-Ressource
ISSN:
1600-5368
DOI:
10.1107/S1600536814013142
DOI:
10.1107/S1600536814013142/wm5029sup1.cif
DOI:
10.1107/S1600536814013142/wm5029Isup2.hkl
Sprache:
Unbekannt
Verlag:
International Union of Crystallography (IUCr)
Publikationsdatum:
2014
ZDB Id:
2843762-7
ZDB Id:
2041947-8
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