The ternary system cerium-rhodium-silicon
- Autor(en)
- Alexander V Gribanov, Andrij Grytsiv, Sergey Safronov, Peter Franz Rogl, Julia Rousnyak, Yuri D. Seropegin, Gerald Giester
- Abstrakt
Phase relations have been established in the ternary system Ce-Rh-Si for the isothermal section at 800 C based on X-ray powder diffraction and EPMA on about 80 alloys, which were prepd. by arc melting under argon or by powder reaction sintering. From the 25 ternary compds. obsd. at 800 C 13 phases have been reported earlier. Based on XPD Rietveld refinements the crystal structures for 9 new ternary phases were assigned to known structure types. Structural chem. of these compds. follows the characteristics already outlined for their prototype structures: .tau. 7-Ce3RhSi3, (Ba3Al2Ge2-type), .tau. 8-Ce2Rh3- xSi3+ x (Ce2Rh1.35Ge4.65-type), .tau. 10-Ce3Rh4- xSi4+ x (U3Ni4Si4-type), .tau. 11-CeRh6Si4 (LiCo6P4-type), .tau. 13-Ce6Rh30Si19.3 (U6Co30Si19-type), .tau. 18-Ce4Rh4Si3 (Sm4Pd4Si3-type), .tau. 21-CeRh2Si (CeIr2Si-type), .tau. 22-Ce2Rh3+ xSi1- x (Y2Rh3Ge-type) and .tau. 24-Ce8(Rh1- xSix)24Si (Ce8Pd24Sb-type). For .tau. 25-Ce4(Rh1- xSix)12Si a novel bcc structure was proposed from Rietveld anal. Detailed crystal structure data were derived for .tau. 3-CeRhSi2 (CeNiSi2-type) and .tau. 6-Ce2Rh3Si5 (U2Co3Si5-type) by X-ray single crystal expts., confirming the structure types. The crystal structures of .tau. 4-Ce22Rh22Si56, .tau. 5-Ce20Rh27Si53 and .tau. 23-Ce33.3Rh58.2-55.2Si8.5-11.5 are unknown. High temp. compds. with compns. Ce10Rh51Si33 (U10Co51Si33-type) and CeRhSi (LaIrSi-type) have been obsd. in as-cast alloys but these phases do not participate in the phase equil. at 800 C.
- Organisation(en)
- Institut für Physikalische Chemie, Institut für Mineralogie und Kristallographie
- Externe Organisation(en)
- Lomonosov Moscow State University (MSU)
- Journal
- Journal of Solid State Chemistry
- Band
- 183
- Seiten
- 829-843
- Anzahl der Seiten
- 15
- ISSN
- 0022-4596
- Publikationsdatum
- 2010
- Peer-reviewed
- Ja
- ÖFOS 2012
- 104017 Physikalische Chemie, 105113 Kristallographie
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/36a9468a-158c-4e55-8fcd-2f9293dd41d4