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- W1650004908 abstract "Abstract Using X‐ray diffraction it was established that the actual composition of the ternary compound reported as “TbAl 2 Ge” is close to Tb 2 Al 3 Ge 3 (refined Tb 2 Al 3.039(1) Ge 3 ). Differential thermal analysis showed that the compound exists in a narrow temperature range from 618 to 748 °C. The crystal structure was determined from X‐ray powder and single‐crystal diffraction data. An initial model was constructed from CaAl 2 Si 2 ‐ and AlB 2 ‐ (or LiBaSi‐) type slabs. A more detailed investigation revealed that, instead of LiBaSi‐type slabs (where the small atoms form planar nets), the structure contains ScAuSi‐type slabs (corrugated nets), where 1/6 of the Tb atoms have been removed in an ordered way, leading to a rhombohedral superlattice. The final structure represents a new structure type: Pearson symbol hR 234–41.06, space group R $bar{3}$ c , a = 7.2432(3), c = 87.998(8) Å. Part of the Al atoms in the Tb‐deficient ScAuSi‐type slabs occupy a site that forms Al 3 triangles. The structure of Tb 2 Al 3 Ge 3 is thus closely related to the rhombohedral ErNi 3 Al 9 and orthorhombic Y 2 Co 3 Ga 9 structure types, which contain one‐atom thick Er 2 Al 3 (Y 2 Ga 3 ) layers formed by rare‐earth metal atoms and Al 3 (Ga 3 ) triangles. Compounds isotypic with Tb 2 Al 3 Ge 3 were found in the systems Y‐Al‐Ge and Gd‐Al‐Ge." @default.
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- W1650004908 date "2014-09-05" @default.
- W1650004908 modified "2023-09-27" @default.
- W1650004908 title "Tb<sub>2</sub>Al<sub>3</sub>Ge<sub>3</sub>, a New Partly Disordered Structure Type with Al<sub>3</sub>Triangles" @default.
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- W1650004908 doi "https://doi.org/10.1002/zaac.201400320" @default.
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