On the system cerium-platinum-silicon
- Autor(en)
- Andrij Grytsiv, Peter Franz Rogl, Gerald Giester, Esmaeil Royanian, Alexander V Gribanov, Yuri D. Seropegin, Ernst Bauer
- Abstrakt
Phase relations in the ternary system Ce-Pt-Si have been established for the isothermal section at 800 C based on X-ray powder diffraction, metallog., SEM (SEM) and electron probe microanal. (EPMA) techniques on about 120 alloys, which were prepd. by various methods employing arc-melting under argon or powder reaction sintering. Nineteen ternary compds. were obsd. Atom order in the crystal structures of .tau. 18-Ce5(Pt,Si)4 (Pnma; a=0.77223(3) nm, b=1.53279(8) nm c=0.80054(5) nm), .tau. 3-Ce2Pt7Si4 (Pnma; a=1.96335(8) nm, b=0.40361(4) nm, c=1.12240(6) nm) and .tau. 10-CePtSi2 (Cmcm; a=0.42943(2) nm, b=1.67357(5) nm, c=0.42372(2) nm) was detd. by direct methods from X-ray single-crystal CCD data and found to be isotypic with the Sm5Ge4-type, the Ce2Pt7Ge4-type and the CeNiSi2-type, resp. Rietveld refinements established the atom arrangement in the structures of Pt3Si (Pt3Ge-type, C2/m, a=0.7724(2) nm, b=0.7767(2) nm, c=0.5390(2) nm, .beta.=133.86(2)), .tau. 16-Ce3Pt5Si (Ce3Pd5Si-type, Imma, a=0.74025(8) nm, b=1.2951(2) nm, c=0.7508(1) nm) and .tau. 17-Ce3PtSi3 (Ba3Al2Ge2-type, Immm, a=0.41065(5) nm, b=0.43221(5) nm, c=1.8375(3) nm). Phase equil. in Ce-Pt-Si are characterised by the absence of cerium soly. in platinum silicides. Cerium silicides and cerium platinides, however, dissolve significant amts. of the third component, whereby random substitution of the almost equally sized atom species platinum and silicon is reflected in extended homogeneous regions at const. Ce content such as for .tau. 13-Ce(PtxSi1- x)2, .tau. 6-Ce2Pt3+ xSi5- x or .tau. 7-CePt2- xSi2+ x.
- Organisation(en)
- Institut für Physikalische Chemie, Institut für Mineralogie und Kristallographie
- Externe Organisation(en)
- Lomonosov Moscow State University (MSU), Technische Universität Wien
- Journal
- Journal of Solid State Chemistry
- Band
- 181
- Seiten
- 2964-2975
- Anzahl der Seiten
- 12
- ISSN
- 0022-4596
- Publikationsdatum
- 2008
- Peer-reviewed
- Ja
- ÖFOS 2012
- 105113 Kristallographie
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/282cbcbd-ab5e-4b9d-8469-0b9a9c161372