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