Ternary rare-earth alumo-silicides-single-crystal growth from Al flux, structural and physical properties

Journal Article · Wed Jun 15 04:00:00 EDT 2005 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2005.04.021· OSTI ID:20726001

Bobev, Svilen ^[1]; Tobash, Paul H ^[1]; Fritsch, Veronika ^[2]; Thompson, Joe D ^[2]; Hundley, Michael F ^[2]; Sarrao, John L ^[2]; Fisk, Zachary ^[3]

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1. Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716 (United States)
2. MST-10, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
3. Department of Physics, University of California, Davis, CA 95616 (United States)

A number of rare-earth alumo-silicides (R-Al-Si) have been synthesized from the corresponding elements by high-temperature reactions, carried out in excess of aluminum to serve as a flux. Under these experimental conditions, large single crystals of all R-Al-Si ternary phases were readily produced. The crystal structures these ternaries adopt were studied by means of powder and single-crystal X-ray diffraction and were classified as follows: (1) the early rare-earths (R=La, Ce, Pr, Nd, Sm, Gd) yield RAl{sub x}Si{sub 2-x}, x{approx}1, non-stoichiometric ternary derivatives of the body-centered {alpha}-ThSi{sub 2}-type; (2) the late rare-earths (R=Tb, Dy, Ho, Er, Tm) form stoichiometric R{sub 2}Al{sub 3}Si{sub 2} compounds that crystallize in the C-centered monoclinic Y{sub 2}Al{sub 3}Si{sub 2}-type; (3) the divalent Eu and Yb produce EuAl{sub 2}Si{sub 2} and YbAl{sub 2}Si{sub 2} with the trigonal CaAl{sub 2}Si{sub 2}-type, whereas the last lanthanide element, Lu, forms LuAlSi with C-centered orthorhombic YAlGe-type. These structural trends are reviewed, and the evolution of the basic physical properties such as magnetism, heat capacity and electrical resistivity when moving across the series is described in detail.

• OSTI ID: 20726001
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 6 Vol. 178; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ALUMINIUM COMPOUNDS
MAGNETISM
MONOCLINIC LATTICES
MONOCRYSTALS
RARE EARTH COMPOUNDS
SILICIDES
SPECIFIC HEAT
X-RAY DIFFRACTION