Al7+xFe23Ge14-x and Al7+xFe9Ge5-x
- Autor(en)
- Gabriel R. Reisinger, Herta S. Effenberger, Klaus W. Richter
- Abstrakt
The title compounds were synthesised from the pure elements by arc melting and subsequent heat treatment at 800 °C. They were characterised by powder- and single-crystal XRD, their homogeneity ranges were investigated by scanning electron microscopy and EDX from a series of samples with distinct overall compositions. Al
7+xFe
23Ge
14-x(−0.8 ≤ x ≤ 1.8, orthorhombic, space group Cmc2
1, Pearson symbol oC176; a = 7.912 (2), b = 19.786(6), c = 14.769(5) Å) adopts a new crystal structure type, while Al
7+xFe
9Ge
5-x, (−0.7 ≤ x ≤ 3.5, monoclinic, space group C2/m, Pearson symbol mC42; a = 10.147(2), b = 7.5394(12), c = 7.8744(12) Å, β = 108.396(15)°) was found to be isotypic with Fe
3Ga
4. Within the accuracy of structure refinements the Fe atoms build an ordered and fully occupied sublattice, whereas extensive mixed occupation between aluminium and germanium atoms is evident. Both compounds exhibit noticeable homogeneity ranges based on extensive (Al,Ge) substitutions. Their crystal structures are related to the Fe
6Ge
5-structure type (monoclinic, space group C2/m, Pearson symbol mC44). Structural features and relations are discussed; homogeneity ranges as well as the corresponding lattice parameters are given.
- Organisation(en)
- Institut für Funktionelle Materialien und Katalyse, Institut für Mineralogie und Kristallographie
- Journal
- Journal of Alloys and Compounds
- Band
- 693
- Seiten
- 692-699
- Anzahl der Seiten
- 8
- ISSN
- 0925-8388
- DOI
- https://doi.org/10.1016/j.jallcom.2016.09.236
- Publikationsdatum
- 02-2017
- Peer-reviewed
- Ja
- ÖFOS 2012
- 104003 Anorganische Chemie, 104017 Physikalische Chemie, 104011 Materialchemie, 105113 Kristallographie
- Schlagwörter
- ASJC Scopus Sachgebiete
- Mechanics of Materials, Mechanical Engineering, Metals and Alloys, Materials Chemistry
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/c8934dcd-1d99-4a23-8160-4bb57e7aed53