The ternary system cerium-rhodium-silicon

Journal Article · Thu Apr 15 04:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.01.029· OSTI ID:21372560

Lipatov, Alexey ^[1]; Gribanov, Alexander ^[1]; Grytsiv, Andriy ^[1]; Safronov, Sergey ^[2]; Rogl, Peter ^[1]; Rousnyak, Julia; Seropegin, Yurii ^[2]; Giester, Gerald ^[3]

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1. Institute of Physical Chemistry, University of Vienna, Waehringerstrasse 42, A-1090 Wien (Austria)
2. Chemistry Department of the Moscow State University, Leninskie Gory 1, GSP-1, 119991 Moscow (Russian Federation)
3. Institute of Mineralogy and Crystallography, University of Vienna, Althanstrasse 14, A-1090 Wien (Austria)

Phase relations have been established in the ternary system Ce-Rh-Si for the isothermal section at 800 deg. C based on X-ray powder diffraction and EPMA on about 80 alloys, which were prepared by arc melting under argon or by powder reaction sintering. From the 25 ternary compounds observed at 800 deg. 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 chemistry of these compounds follows the characteristics already outlined for their prototype structures: tau{sub 7}-Ce{sub 3}RhSi{sub 3}, (Ba{sub 3}Al{sub 2}Ge{sub 2}-type), tau{sub 8}-Ce{sub 2}Rh{sub 3-x}Si{sub 3+x} (Ce{sub 2}Rh{sub 1.35}Ge{sub 4.65}-type), tau{sub 10}-Ce{sub 3}Rh{sub 4-x}Si{sub 4+x} (U{sub 3}Ni{sub 4}Si{sub 4}-type), tau{sub 11}-CeRh{sub 6}Si{sub 4} (LiCo{sub 6}P{sub 4}-type), tau{sub 13}-Ce{sub 6}Rh{sub 30}Si{sub 19.3} (U{sub 6}Co{sub 30}Si{sub 19}-type), tau{sub 18}-Ce{sub 4}Rh{sub 4}Si{sub 3} (Sm{sub 4}Pd{sub 4}Si{sub 3}-type), tau{sub 21}-CeRh{sub 2}Si (CeIr{sub 2}Si-type), tau{sub 22}-Ce{sub 2}Rh{sub 3+x}Si{sub 1-x} (Y{sub 2}Rh{sub 3}Ge-type) and tau{sub 24}-Ce{sub 8}(Rh{sub 1-x}Si{sub x}){sub 24}Si (Ce{sub 8}Pd{sub 24}Sb-type). For tau{sub 25}-Ce{sub 4}(Rh{sub 1-x}Si{sub x}){sub 12}Si a novel bcc structure was proposed from Rietveld analysis. Detailed crystal structure data were derived for tau{sub 3}-CeRhSi{sub 2} (CeNiSi{sub 2}-type) and tau{sub 6}-Ce{sub 2}Rh{sub 3}Si{sub 5} (U{sub 2}Co{sub 3}Si{sub 5}-type) by X-ray single crystal experiments, confirming the structure types. The crystal structures of tau{sub 4}-Ce{sub 22}Rh{sub 22}Si{sub 56}, tau{sub 5}-Ce{sub 20}Rh{sub 27}Si{sub 53} and tau{sub 23}-Ce{sub 33.3}Rh{sub 58.2-55.2}Si{sub 8.5-11.5} are unknown. High temperature compounds with compositions Ce{sub 10}Rh{sub 51}Si{sub 33} (U{sub 10}Co{sub 51}Si{sub 33}-type) and CeRhSi (LaIrSi-type) have been observed in as-cast alloys but these phases do not participate in the phase equilibria at 800 deg. C. - Graphical abstract: Phase relations in the ternary system Ce-Rh-Si have been established for the isothermal section at 800 deg. C based on X-ray powder and single-crystal diffraction, metallography, SEM and EMPA techniques on about 80 alloys. 25 ternary compounds were observed.

• OSTI ID: 21372560
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 4 Vol. 183; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
ARGON
BCC LATTICES
CERIUM ALLOYS
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
DIAGRAMS
DIFFRACTION
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
ELEMENTS
FABRICATION
FLUIDS
GASES
INFORMATION
MELTING
METALLOGRAPHY
MICROSCOPY
MONOCRYSTALS
NONMETALS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
PHOTOELECTRON SPECTROSCOPY
PLATINUM METAL ALLOYS
RARE EARTH ALLOYS
RARE GASES
RHODIUM ALLOYS
SCANNING ELECTRON MICROSCOPY
SCATTERING
SILICON ALLOYS
SINTERING
SPECTROSCOPY
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TRANSITION ELEMENT ALLOYS
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY