The ternary system cerium-palladium-silicon

Autor(en)

Alexander V Gribanov, Andrij Grytsiv, Peter Franz Rogl, Elena V. Murashova, Yuri D. Seropegin, Gerald Giester, Konstantin Kalmykov

Abstrakt

Phase relations in the ternary system Ce-Pd-Si have been established for the isothermal section at 800 C based on X-ray powder diffraction and EMPA techniques on about 130 alloys, which were prepd. by arc-melting under argon or powder reaction sintering. Eighteen ternary compds. have been obsd. to participate in the phase equil. at 800 C. Atom order was detd. by direct methods from X-ray single-crystal counter data for the crystal structures of .tau. 8-Ce3Pd4Si4 (U3Ni4Si4-type, Immm; a=0.41618(1), b=0.42640(1), c=2.45744(7) nm), .tau. 16-Ce2Pd14Si (own structure type, P4/nmm; a=0.88832(2), c=0.69600(2) nm) and also for .tau. 18-CePd1- xSix (x=0.07; FeB-type, Pnma; a=0.74422(5), b=0.45548(3), c=0.58569(4) nm). Rietveld refinements established the atom arrangement in the structures of .tau. 5-Ce3PdSi3 (Ba3Al2Ge2-type, Immm; a=0.41207(1), b=0.43026(1), c=1.84069(4) nm) and .tau. 13-Ce3- xPd20+ xSi6 (0x1, Co20Al3B6-type, Fm3m; a=1.21527(2) nm). The ternary compd. Ce2Pd3Si3 (structure-type Ce2Rh1.35Ge4.65, Pmmn; a=0.42040(1), b=0.42247(1), c=1.72444(3) nm) was detected as a high-temp. compd., however, does not participate in the equil. at 800 C. Phase equil. in Ce-Pd-Si are characterized by the absence of cerium soly. in palladium silicides. Mutual soly. among cerium silicides and cerium-palladium compds. are significant whereby random substitution of the almost equally sized atom species palladium and silicon is reflected in extended homogeneous regions at const. Ce-content such as for .tau. 2-Ce(PdxSi1- x)2 (AlB2-deriv. type), .tau.6-Ce(PdxSi1- x)2 (ThSi2-type) and .tau. 7-CePd2- xSi2+ x. The crystal structures of compds. .tau. 4-Ce 8Pd 46Si 46, .tau. 12-Ce 29Pd 49Si 22, .tau. 15-Ce 22Pd 67Si 11, .tau. 17-Ce 5Pd 77Si 18 and .tau. 18-CePd1- xSix (x 0.1) are still unknown.

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

182

Seiten

2497-2509

Anzahl der Seiten

13

ISSN

0022-4596

Publikationsdatum

2009

Peer-reviewed

Ja

ÖFOS 2012

105113 Kristallographie, 104001 Allgemeine Chemie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/04104c84-f6fa-4b38-b772-fe3cf669accd