The ternary Laves phase Nb(Ni1-xAlx)2 with MgZn2 -type

Autor(en)

Xinlin Yan, Andrij Grytsiv, Harald Schmidt, Gerald Giester, Peter Franz Rogl

Abstrakt

Alloys with nominal compn. Nb(Ni1-xAlx)2 (x Al=0.15, 0.23, 0.30, 0.38, 0.46, 0.54, 0.62, 0.69, 0.77, 0.85) were investigated by means of X-ray powder and single crystal diffraction, optical microscopy, electron probe microanal. (EPMA) concg. on structural details of the C14 MgZn2-type Laves phase. Rietveld refinements of X-ray powder data ( 0.23 <x Al <0.77 ) revealed that Nb atoms fully occupy the 4f sites, whereas Ni and Al atoms share 6h and 2a sites in a random fashion. Single crystal refinement for Nb(Ni0.54Al0.46)2 confirmed structure type and atom order in line with results from powder diffraction. The characteristic site preferences throughout the series of alloys serve as a basis for the interpretation of the non-linear dependence of unit cell parameters with Al content.

Organisation(en)

Institut für Physikalische Chemie, Institut für Mineralogie und Kristallographie

Journal

CALPHAD: the international research journal for calculation of phase diagrams

Band

33

Seiten

11-16

Anzahl der Seiten

6

ISSN

0364-5916

Publikationsdatum

2009

Peer-reviewed

Ja

ÖFOS 2012

105113 Kristallographie, 104011 Materialchemie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/d004eab7-ab03-4720-b31b-36366d6ab554