Laves phases in the ternary systems Ti-{Pd, Pt}-Al
- Author(s)
- Andrij Grytsiv, Xinlin Yan, Harald Schmidt, Gerald Giester, Xingqiu Chen, Peter Franz Rogl, Adriana Saccone
- Abstract
Formation and crystal structure of Laves phases in the systems Ti-{Pd,Pt}-Al were investigated employing XPD (X-ray powder diffraction), XSCD (X-ray single crystal diffraction) and EPMA (electron probe microanal.) techniques. Laves phases with MgZn2 type (space group: P63/mmc) and its variant with the Nb(Ir,Al)2-type (a.sqroot.3 × a.sqroot.3 × c supercell of MgZn2-type, space group: P63/mcm) were found in both systems. Formation of a particular structure type is dependent on temp. and compn. Laves phases with the Nb(Ir,Al)2-type form around 25 at.% of Pd,Pt at 950 °C. The MgZn2-type Laves phase Ti(Pt,Al)2 was not obsd. at 950 °C, but it forms in as-cast alloys at a slightly lower Pt content, Ti37.8Pt19.0Al43.2. In the Ti-Pd-Al system at 950 °C the MgZn2-type phase exists at the Pd-poor side of the homogeneity region while the Nb(Ir,Al)2-type phase is slightly richer in Pd. Phase relations assocd. with the Ti-Pt-Al Laves phase were established at 950 °C and reveal a new compd. TiPtAl that derives from hexagonal ZrBeSi-type (ordered Ni2In-type, a = 0.43925(4) nm, c = 0.54844(5); space group P63/mmc; R F2 = 0.015 from single crystal data). Atom distribution in the compd. shows a slight deviation from full atom order Ti(Pt0.97Al0.03)(Al0.98Pt0.02).
- Organisation(s)
- Department of Physical Chemistry, Department of Mineralogy and Crystallography
- External organisation(s)
- Università degli Studi di Genova
- Journal
- Intermetallics
- Volume
- 17
- Pages
- 336-342
- No. of pages
- 7
- ISSN
- 0966-9795
- Publication date
- 2009
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105113 Crystallography
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/bdb8a3b7-54ff-4354-8a81-3f5fb9fae798